Patent Description:
Over the last few years, there has been a rapid growth in the use of optical fiber cables. One such type of optical fiber cables are air blown optical fiber cables. These air blown optical fiber cables arc used for various indoor-outdoor applications. The air blown optical fiber cables are installed inducts/microduct. Traditionally, the air blown optical fiber cables are installed by blowing the optical fiber cable into a duct/microduct while simultaneously pushing the optical cable into the duct in starting length of cable to support the initial blowing of the optical fiber cable. The blowing is done by injecting a high volume of compressed air into the duct which flows inside the duct at high speed. Accordingly, the high speed air propels the optical fiber cable further inside the duct. The optical fiber cable is blown with a cable blowing machine. Typically, the structure of these air blown optical fiber cables includes a number of buffer tubes. The buffer tubes are stranded around a central strength member in an S-Z fashion. In addition, the buffer tubes are enclosed by a sheathing layer for prnviding protection to the air blown optical fiber cable. Typically, the buffer tubes are formed using polybutylene terephthalate, PA-<NUM> or polypropylene. Further, the buffer tubes are single layer buffer tubes.

The currently available air blown optical fiber cables have certain drawbacks. The existing air blown optical fiber cables limits blowing distance and speed for installation in smaller ducts due to the large diameter. In addition, the single layer design of the buffer tubes leads to a higher thickness of the buffer tubes. The higher thickness of the buffer tubes results in a large diameter of the buffer tubes. Accordingly, the large diameter of the buffer tubes leads to large diameter of the air blown optical fiber cables. Further, the conventionally available air blown optical fiber cables with large optical fiber diameter with single layer buffer tubes is large diameter optical fiber cable. This affects the blowing performance of the air blown optical fiber cables into a duct of predefined size. These air blown optical fiber cables with large diameter are difficult to blow for large distances in the predefined duct size. Therefore, the conventionally available optical fiber cables of this kind are blown into duct of higher size. Furthermore, the existing optical fiber cables use optical fiber having a diameter of about <NUM> micrometer to reduce the overall diameter of the optical fiber cable to serve the purpose of duct size.

In light of the foregoing discussion, there exists a need for an optical fiber cable which overcomes the above cited drawbacks of conventionally known optical fiber cables.

The invention provides an optical fiber cable as defined by claim <NUM>. The optical fiber cable includes a central strength member lying substantially along a longitudinal axis of the optical fiber cable. The optical fiber cable includes a first layer wrapped helically around the central strength member. The optical fiber cable includes a plurality of buffer tubes stranded helically around the first layer. Each of the plurality of buffer tubes is formed of a combination of two sub layers having different material. The optical fiber cable includes a second layer cross helically positioned around the core of the optical fiber cable. The second layer is formed of a pair of binder yarns. The optical fiber cable includes a third layer wrapped helically around the core of the optical fiber cable. The optical fiber cable includes a fourth layer surrounding the third layer. The central strength member is formed of fibre reinforced plastic. The central strength member has a diameter of about <NUM>. The first layer is formed of a plurality of water swellable yarns. Each of the plurality of buffer tubes has a first sub layer and a second sub layer. The first sub layer is formed of polycarbonate. The first sub layer is the inner sub layer of each of the plurality of buffer tubes. The second sub layer is formed of polybutylene terephthalate. The second sub layer is the outer sub layer of each of the plurality of buffer tubes. The second layer is formed of a pair of binder yarns. The pair of binder yarn includes a first binder yarn wrapped helically in clockwise direction and a second binder yarn wrapped helically in anti- clockwise direction. Each of the plurality of buffer tubes encloses a plurality of optical fibers. The third layer is formed of a plurality of water swellable yarns. The fourth layer is formed of high density polyethylene. The optical fiber cable has a diameter of about <NUM>± <NUM>.

In an embodiment of the present disclosure, each of the plurality of buffer tubes has a first diameter of about <NUM> ± <NUM>. Each of the plurality of buffer tubes has a second diameter of about <NUM> ±<NUM>.

In an embodiment of the present disclosure, the first sub layer has a thickness of about <NUM> micrometer ± <NUM> micrometer. The first sub layer has a density of about <NUM>/cm<NUM>.

In an embodiment of the present disclosure, the second sub layer has a thickness of about <NUM> micrometer ± <NUM> micrometer. The second sub layer has a density of about <NUM>/cm<NUM>.

In an embodiment of the present disclosure, the plurality of buffer tubes is eight. The plurality of optical fibers in each of the plurality of buffer tubes is twenty four. Each of the plurality of optical fibers has a diameter of about <NUM> micrometer.

In an embodiment of the present disclosure, the fourth layer has a thickness in a range of about <NUM> to <NUM>, wherein the fourth layer has a density in a range of about <NUM>/cm<NUM> to <NUM>/cm<NUM>.

In an embodiment of the present disclosure, the central strength member is a solid pultrusion type fiber reinforced plastic. The central strength member is coated with a polyethylene layer. The central strength member is coated to accommodate plurality of buffer tubes.

In an embodiment of the present disclosure, the first binder yarn and the second binder yarn is an aramid type binder yarn.

In an embodiment of the present disclosure, the binder yarn is water blocking type aramid yarn.

In an embodiment of the present disclosure, further include a plurality of ripcords. The plurality of ripcords is positioned below the fourth layer and along with the third layer in linear manner.

In an embodiment of the present disclosure, the optical fiber cable is blown into a duct having an inner diameter of <NUM> and outer diameter of <NUM>. The optical fiber cable when blown into duct having an inner diameter of <NUM> and outer diameter of <NUM> has a fill factor in a range of about <NUM>% to <NUM>%.

In an embodiment of the present disclosure, the buffer tube has a packing factor in a range of about <NUM>% to <NUM>%. The buffer tube has packing factor which is defined as ratio of equivalent cross sectional area of fiber bunch to inner cross sectional area of the buffer tube. The equivalent cross sectional area is the area formed by equivalent diameter of fiber bunch which is calculated by formula, <NUM> * Square root of number fibers per tube * Diameter of the fiber.

In another aspect, the present disclosure provides an optical fiber cable. The optical fiber cable includes a central strength member lying substantially along a longitudinal axis of the optical fiber cable. The optical fiber cable includes a first layer wrapped helically around the central strength member. The optical fiber cable includes a plurality of buffer tubes stranded helically around the first layer. Each of the plurality of buffer tubes encloses a plurality of optical fibers. The optical fiber cable includes a second layer cross helically positioned around the core of the optical fiber cable. The optical fiber cable includes a third layer wrapped helically around the core of the optical fiber cable. The optical fiber cable includes a fourth layer surrounding the third layer. The central strength member is formed of fiber reinforced plastic. The central strength member has a diameter of about <NUM>. The first layer is a plurality of water swellable yarns. Each of the plurality of buffer tubes has a first diameter of about <NUM> ± <NUM>. Each of the plurality of buffer tubes has a second diameter of about <NUM> ±<NUM>. Each of the plurality of buffer tubes is formed of a combination of two sub layers having different material. Each of the plurality of buffer tubes has a first sub layer and a second sub layer. The first sub layer is formed of polycarbonate. The first sub layer is the inner sub layer of each of the plurality of buffer tubes. The first sub layer has a thickness of about <NUM> micrometer ± <NUM> micrometer. The first sub layer has a density of about <NUM>/cm<NUM>. The second sub layer is formed of polybutylene terephthalate. The second sub layer is the outer sub layer of each of the plurality of buffer tubes. The second sub layer has a thickness of about <NUM> micrometer ± <NUM> micrometer, wherein the second sub layer has a density of about <NUM>/cm<NUM>. Each of the plurality of buffer tubes encloses a plurality of optical fibers. The plurality of buffer tubes is eight. The plurality of optical fibers in each of the plurality buffer tube is twenty four. Each of the plurality of optical fibers has a diameter of about <NUM> micrometer. The second layer is formed of a pair of binder yarns. The pair of binder yarn includes a first binder yarn wrapped helically in clockwise direction and a second binder yarn wrapped helically in anti-clockwise direction. The third layer is formed of a plurality of water swellable yarns. The fourth layer is formed of high density polyethylene. The fourth layer has a thickness in a range of about <NUM> to <NUM>. The fourth layer has a density in a range of about <NUM>/cm<NUM> to <NUM>/cm<NUM>. The optical fiber cable has a diameter of about <NUM> ± <NUM>.

Having thus described the disclosure, in general, terms, reference will now be formed to the accompanying figures, wherein:.

It should be noted that the accompanying figures are intended to present illustrations of exemplary embodiments of the present disclosure. These figures are not intended to limit the scope of the present disclosure. It should also be noted that accompanying figures are not necessarily drawn to scale.

Reference will now be formed in detail to selected embodiments of the present disclosure in conjunction with accompanying figures. It should be understood that the accompanying figures are intended and provided to illustrate embodiments of the disclosure described below and are not necessarily drawn to scale. In the drawings, like numbers refer to like elements throughout, and thicknesses and dimensions of some components may be exaggerated for providing better clarity and ease of understanding.

It should be noted that the terms "first", "second", and the like, herein do not denote any order, ranking, quantity, or importance, but rather are used to distinguish one element from another. Further, the terms "a" and "an" herein do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced item.

<FIG> illustrates a cross sectional view of an optical fiber cable <NUM>, in accordance with various embodiments of the present disclosure. The optical fiber cable <NUM> is a micro optical fiber cable. The optical fiber cable <NUM> is used for installation in micro ducts. In addition, the optical fiber cable <NUM> is used for underground installations. Also, the optical fiber cable <NUM> is used for communication, and the like. In an embodiment of the present disclosure, the optical fiber cable <NUM> is a 192F micro optical fiber cable. In addition, 192F corresponds to <NUM> optical fibers. Further, the optical fiber cable <NUM> has a small diameter which makes the optical fiber cable <NUM> suitable for installation in the smaller micro ducts.

The optical fiber cable <NUM> is formed of a plurality of layers (mentioned below in the patent application). The optical fiber cable encloses plurality of buffer tubes each formed of two sub layers having different material and thickness. Each buffer tube of the plurality of buffer tubes encloses a plurality of optical fibers. In an embodiment of the present disclosure, the plurality of optical fibers is loosely held inside the each of the plurality of buffer tubes. In an embodiment of the present disclosure, each of the plurality of buffer tube has a small diameter (mentioned below in the patent application). Further, the optical fiber cable <NUM> has a reduced cable diameter (provided below in the patent application).

The optical fiber cable <NUM> includes a central strength member <NUM>, a first layer <NUM>, a plurality of buffer tubes <NUM> and a plurality of optical fibers <NUM>. In addition, the optical fiber cable <NUM> includes a second layer <NUM>, a third layer <NUM> and a fourth layer <NUM>. Further, the optical fiber cable <NUM> includes a plurality of ripcords 176a-176b.

The optical fiber cable <NUM> includes the central strength member <NUM>. The central strength member <NUM> lies substantially along a longitudinal axis of the optical fiber cable <NUM>. In an embodiment of the present disclosure, the central strength member <NUM> is formed of fiber reinforced plastic. The central strength member <NUM> is a solid pultrusion type fiber reinforced plastic. The fiber reinforced plastic is a composite material having a polymer matrix reinforced with glass fibers. In an example, the fiber reinforced plastics includes but may not be limited to glass fibers, carbon fibers, aramid fibers, basalt fibers and the like. In another embodiment of the present disclosure, the central strength member <NUM> is formed of any other suitable material. In an embodiment of the present disclosure, the central strength member <NUM> may be coated with a layer of polyethylene. The central strength member <NUM> is coated to accommodate the plurality of buffer tubes around it. In another embodiment of the present disclosure, the central strength member may be coated with any other suitable material. In yet another embodiment of the present disclosure, the central strength member <NUM> may not be coated. In an embodiment of the present disclosure, the central strength member <NUM> has a circular cross-section.

The central strength member <NUM> provides physical strength to the optical fiber cable <NUM> and resists over bending of the optical fiber cable <NUM>. In addition, the central strength member <NUM> provides tensile strength to the optical fiber cable <NUM>. The tensile strength corresponds to a resistance shown by the optical fiber cable <NUM> against longitudinal loads. The central strength member <NUM> is characterized by a diameter measured along the cross section. In an embodiment of the present disclosure, the diameter of the central strength member <NUM> is about 3millimeters. In another embodiment of the present disclosure, the diameter of the central strength member <NUM> may vary.

The optical fiber cable <NUM> includes the first layer <NUM>. The first layer <NUM> surrounds the central strength member <NUM>. The first layer <NUM> includes a plurality of water swellable yarns 164a-164c helically disposed around the central strength member <NUM> and the plurality of buffer tubes <NUM>. The plurality of water swellable yarns 164a-164c prevents ingression of water inside the core of the optical fiber cable <NUM>. In an embodiment of the present disclosure, the number of water swellable yarns present in the first layer <NUM> is <NUM>. In another embodiment of the present disclosure, the number of water swellable yarns present in the first layer <NUM> may vary.

The optical fiber cable <NUM> includes the plurality buffer tubes <NUM>. The plurality of buffer tubes <NUM> is stranded around the first layer <NUM> in a helical fashion. The cross section of each of the plurality of buffer tubes <NUM> is circular in shape. In an embodiment of the present disclosure, the cross section of each of the plurality of buffer tubes <NUM> may be of any suitable shape. In an embodiment of the present disclosure, each of the plurality of buffer tubes <NUM> has a uniform structure and dimensions. In an embodiment of the present disclosure, the plurality of buffer tubes <NUM> includes <NUM> buffer tubes. Each of the plurality of buffer tubes <NUM> is having two sub layers. Two sub layers include a first sub layer and a second sub layer. The first sub layer is the inner sub layer and the second sub layer is the outer sub layer. Each sub layer is formed of a different material. Each sub layer has a different thickness. Each sub layer has a different density. The inner sub layer is formed of polycarbonate having a density of about <NUM>/cm<NUM>. In general, polycarbonates are a group of thermoplastic containing carbonate groups in chemical structure. The inner sub layer has a thickness of about of about <NUM> micrometer ± <NUM> micrometer. The outer sub layer is formed of polybutylene terephthalate. The second sub layer has a density of about <NUM>/cm<NUM>. The second sub layer has a thickness of about <NUM> micrometer ± <NUM> micrometer. In another embodiment of the present disclosure the thickness and density of the inner sub layer and the outer sub layer may vary.

Furthermore, each of the plurality of buffer tubes <NUM> has a first diameter and a second diameter. In an embodiment of the present disclosure, the first diameter and the second diameter of each of the plurality of buffer tubes <NUM> is fixed. In an embodiment of the present disclosure, the first diameter of each of the plurality buffer tubes <NUM> is about <NUM> ± <NUM>. In another embodiment of the present disclosure, the first diameter of each of the plurality of buffer tubes <NUM> may vary. In an embodiment of the present disclosure, the second diameter of each of the plurality of buffer tubes <NUM> about <NUM> ± <NUM>. In another embodiment of the present disclosure, the second diameter of each of the plurality of buffer tubes <NUM> may vary.

Going further, each of the plurality of buffer tubes <NUM> encloses the plurality of optical fibers <NUM>. In an embodiment of the present disclosure, each of the plurality of buffer tubes <NUM> encloses <NUM> optical fibers. In another embodiment of the present disclosure, each of the plurality of buffer tubes <NUM> encloses <NUM> optical fibers (as shown in <FIG>). Each of the plurality of buffer tubes <NUM> is a tube for encapsulating the plurality of optical fibers <NUM>. The plurality of buffer tubes <NUM> provides support and protection to each of the plurality of optical fibers <NUM> against crush, bend and stretch. In addition, the plurality of buffer tubes <NUM> protects the plurality of optical fibers <NUM> and prevents ingression of water inside the stranded core of the optical fiber cable <NUM>. Further, each of the plurality of buffer tubes <NUM> provides mechanical isolation, physical damage protection and identification of each of the plurality of optical fibers
<NUM>. Each of the plurality of buffer tubes <NUM> is colored. In an embodiment of the present disclosure, the color of plurality of buffer tubes <NUM> includes red, green, yellow, brown, blue, purple, grey (slate) and orange. In another embodiment of the present disclosure, the color of each of the plurality of buffer tubes <NUM> may vary. The coloring is done for identification of each of the plurality of buffer tubes <NUM>. In an embodiment of the present disclosure, each of the plurality of buffer tubes <NUM> is filled with a gel. In an embodiment of the present disclosure, the gel is a thixotropic gel. In an embodiment of the present disclosure, the thixotropic gel prevents ingression of water inside each of the plurality of buffer tubes <NUM>.

Further, each of the plurality of optical fibers <NUM> is a fiber used for transmitting information as light pulses from one end to another. In addition, each of the plurality of optical fibers <NUM> is a thin strand of glass capable of transmitting optical signals. Further, each of the plurality of optical fibers <NUM> is configured to transmit large amounts of information over long distances with relatively low attenuation. Furthermore, each of the plurality of optical fibers <NUM> includes a core region and a cladding region. The core region is an inner part of an optical fiber and the cladding section is an outer part of the optical fiber. Moreover, the core region is defined by a central longitudinal axis of each of the plurality of optical fibers <NUM>. Also, the cladding region surrounds the core region.

Each of the plurality of optical fibers <NUM> has a diameter of about <NUM> micrometer. In another embodiment of the present disclosure, the diameter of each of the plurality of optical fibers <NUM> may vary. In an embodiment of the present disclosure, each of the plurality of optical fibers <NUM> is a colored optical fiber. In an embodiment of the present disclosure, each of the plurality of optical fibers <NUM> has a different color. The color of each of the plurality of optical fibers <NUM> is selected from the group. The group includes blue, orange, green, brown, slate, yellow, red, violet, white, black, aqua and pink. The group further includes the above color along with a single ring marking. The group further includes the above color along with the double ring marking. The coloring is done for identification of each of the plurality of optical fibers <NUM>. In another embodiment of the present disclosure, each of the plurality of optical fibers <NUM> may be of any different color.

In an embodiment of the present disclosure, a number of the plurality of optical fibers <NUM> in each of the plurality of buffer tubes <NUM> is <NUM>. In an embodiment of the present disclosure, a total number of the plurality of optical fibers <NUM> in the plurality of buffer tubes <NUM> is <NUM> (<NUM>*<NUM> = <NUM>), when the number of buffer tubes is <NUM>. In another embodiment of the present disclosure, a total number of the plurality of optical fibers <NUM> in the plurality of buffer tubes <NUM> is <NUM> (<NUM>* <NUM> = <NUM>), when the number of buffer tubes is <NUM> (as shown in <FIG>). In yet another embodiment of the present disclosure, the number of optical fibers and the number of buffer tubes in the plurality of buffer tubes <NUM> may vary.

In an embodiment of the present disclosure, each of the plurality of optical fibers <NUM> has a fiber attenuation of about <NUM>. 35dB/km at a wavelength of about <NUM> nanometers. In another embodiment of the present disclosure, each of the plurality of optical fibers <NUM> has a fiber attenuation of about <NUM>. 25dB/km at a wavelength of 1550nanometers. In yet another embodiment of the present disclosure, each of the plurality of optical fibers <NUM> has a fiber attenuation of about <NUM>. 4dB/km at a wavelength of <NUM> nanometers. The fiber attenuation corresponds to a loss in optical power as the light travels through each of the plurality of optical fibers <NUM>. Each of the plurality of optical fibers <NUM> has a dispersion of less than <NUM>. The dispersion corresponds to a spreading of the optical signals over time.

The optical fiber cable <NUM> includes the second layer <NUM>. The second layer <NUM> is formed of a pair of binder yarns. The pair of binder yarn is used for binding of the core of the optical fiber cable <NUM>. The second layer <NUM> cross helically surrounds the core of the optical fiber cable <NUM>. The pair of binder yarns includes a first binder yarn and a second binder yarn. The first binder yarn is wrapped helically in clockwise direction. The second binder yarn is wrapped helically in anti-clockwise direction. The first binder yarn is aramid binder yarn. The second binder yarn is aramid binder yarn. In an embodiment of the present disclosure, the binder yarn is a normal binder yarn. In another embodiment of the present disclosure, the binder yarn is a zero shrinkage binder yarn. In yet another embodiment of the present disclosure, the binder yarn is a low shrinkage binder yarn. In an embodiment of the present disclosure, the binder yarn is an aramid yarn. In another embodiment of the present disclosure, the binder yarn is formed of any other suitable material.

The optical fiber cable <NUM> includes the third layer <NUM>. The third layer <NUM> includes a plurality of water swellable yarns. The plurality of water swellable yarns prevents ingression of water and moisture inside the core of the optical fiber cable <NUM>. In addition, the plurality of water swellable yarns prevents water penetration along the length of the optical fiber cable <NUM>. In an embodiment of the present disclosure, the third layer <NUM> of the optical fiber cable <NUM> is replaced with water blocking aramid binder yarns. In another embodiment of the present disclosure, the third layer <NUM> of the optical fiber cable <NUM> is replaced with water blocking rip cords. The use of water blocking aramid binder yarns and water blocking rip cord prevents ingression of water and moisture inside the core of the optical fiber cable <NUM>.

The optical fiber cable <NUM> includes the fourth layer <NUM>. The fourth layer <NUM> is a sheathing layer. In an embodiment of the present disclosure, the fourth layer <NUM> is a sheath formed of at least one of UV proof black medium density polyethylene material and UV proof black high density polyethylene material. In general, medium density polyethylene is a thermoplastic material produced by chromium/silica catalysts, Ziegler-Natta catalysts or metallocene catalysts. In another embodiment of the present disclosure, the fourth layer <NUM> is formed of any other suitable material. The fourth layer <NUM> protects the optical fiber cable <NUM> from harsh environment and harmful UV rays. In addition, !he fourth layer <NUM> has the inherent ability to resist crushes, kinks and tensile stress. In an embodiment of the present disclosure, the fourth layer <NUM> has a thickness of about <NUM> millimeter. In another embodiment of the present disclosure, the fourth layer <NUM> may have any suitable thickness.

The optical fiber cable <NUM> includes the plurality of ripcords 176a-176b. The plurality of ripcords 176a-176b is disposed below the fourth layer <NUM> and along with the third layer <NUM> in linear manner. In an embodiment of the present disclosure, the plurality of ripcords 176a-176b lies substantially along the longitudinal axis of the optical fiber cable <NUM>. The plurality of ripcords 176a-176b facilitates access to the plurality of optical fibers <NUM>. In an embodiment of the present disclosure, the plurality of ripcords 176a-176b is formed of a polyester material. In another embodiment of the present disclosure, the plurality of ripcords 176a-176b is formed of any other suitable material. In an embodiment of the present disclosure, the plurality of ripcords 176a-176b is twisted yarns. In an embodiment of the present disclosure, the number of ripcords in the optical fiber cable <NUM> is <NUM>. In another embodiment of the present disclosure, the number of ripcords in the optical fiber cable <NUM> may vary.

In an embodiment of the present disclosure, the plurality of ripcords 176a-176b in the optical fiber cable <NUM> are replaced by yarns having high strength and water blocking characteristics. The yarns facilitate access to the plurality of optical fibers <NUM> and prevent ingression of water and moisture inside the core of the optical fiber cable <NUM>.

In an embodiment of the present disclosure, the optical fiber cable <NUM> may have a suitable diameter. In an embodiment of the present disclosure, the diameter of the optical fiber cable <NUM> is in a range of about <NUM> ± <NUM>. In another embodiment of the present disclosure, the diameter of the optical fiber cable <NUM> may vary. In an embodiment of the present disclosure, the weight of the optical fiber cable <NUM> is in a range of about <NUM> ± <NUM> kilogram per kilometre. In another embodiment of the present disclosure, the weight of the optical fiber cable <NUM> may vary.

In an embodiment of the present disclosure, each of the plurality of buffer tubes <NUM> has a packing factor in a range of about <NUM>% to <NUM>%. In general, the packing factor of buffer tube is defined as the ratio of equivalent cross-sectional area of optical fiber bunch to the cross-sectional area formed by inner diameter of the buffer tube. Equivalent cross-sectional area is the area formed by equivalent diameter of the optical fiber bunch. Equivalent diameter is calculated by using the expression as follows: <NUM>* Square Root of number of optical fibers per tube * Diameter of optical fiber.

In an embodiment of the present disclosure, the optical fiber cable <NUM> is blown into a duct having a fill factor in a range of about <NUM>% to <NUM>%. The duct is characterized by an inner diameter and an outer diameter. The inner diameter of the duct is about <NUM>. The outer diameter of the duct is about <NUM>. In general, fill factor is a measure of the acceptability of a cable to be installed in a duct. The fill factor is sometimes defined as the ratio of the cross- sectional area of the cable to the cross-sectional area of the bore of the duct and in the case of a cable and a bore diameter, is sometimes defined as the ratio of the square of cable diameter to square of the bore diameter.

In an embodiment of the present disclosure, the optical fiber cable <NUM> has a maximum operation tensile strength of about <NUM> Newton. In an embodiment of the present disclosure, the minimum bending radius of the optical fiber cable <NUM> during installation is <NUM> D and after installation is <NUM> D. In an embodiment of the present disclosure, the crush resistance of the optical fiber cable <NUM> is about <NUM> Newton per <NUM> millimeter. In an embodiment of the present disclosure, the impact strength of the optical fiber cable <NUM> is <NUM> Newton meter. In an embodiment of the present disclosure, the torsion of the optical fiber cable <NUM> is ± <NUM> degree. In an embodiment of the present disclosure, the temperature performance of the optical fiber cable <NUM> during installation is in a range of -<NUM> degree Celsius to <NUM> degree Celsius. In an embodiment of the present disclosure, the temperature performance of the optical fiber cable <NUM> during operation is in a range of -<NUM> degree Celsius to <NUM> degree Celsius. In an embodiment of the present disclosure, the temperature performance of the optical fiber cable <NUM> during storage is in a range of -<NUM> degree Celsius to <NUM> degree Celsius. In another embodiment of the present disclosure, the optical fiber cable <NUM> has any suitable value or range of crush resistance, impact strength, torsion, tensile strength, minimum bending radius and temperature performance.

<FIG> illustrates a cross sectional view of an optical fiber cable <NUM>, in accordance with another embodiment of the present disclosure. The optical fiber cable <NUM> is a 288F micro optical fiber cable. In addition, 288F corresponds to <NUM> optical fibers. Further, the optical fiber cable <NUM> has a small diameter which makes the optical fiber cable <NUM> suitable for installation in the micro ducts. The optical fiber cable <NUM> includes a central strength member <NUM>, a first layer <NUM>, a first layer of plurality of buffer tubes <NUM> and a plurality of optical fibers <NUM>. In addition, the optical fiber cable <NUM> includes a second layer <NUM>, a second layer of plurality of buffer tubes <NUM> and a plurality of optical fibers <NUM>. Further, the optical fiber cable <NUM> includes a third layer <NUM>, a fourth layer <NUM>, a fifth layer <NUM> and a plurality of ripcords 282a- 282b.

The optical fiber cable <NUM> includes the central strength member <NUM>. The central strength member <NUM> lies substantially along a longitudinal axis of the optical fiber cable <NUM>. In an embodiment of the present disclosure, the central strength member <NUM> is formed of fiber reinforced plastic. In an embodiment of the present disclosure, the central strength member <NUM> may be coated with a layer of polyethylene. The central strength member <NUM> is characterized by a diameter measured along the cross section. In an embodiment of the present disclosure, the diameter of the central strength member <NUM> along with the polyethylene coating is about <NUM> millimeters. In another embodiment of the present disclosure, the diameter of the central strength member <NUM> may vary.

The optical fiber cable <NUM> includes the first layer <NUM>. The first layer <NUM> surrounds the central strength member <NUM>. The first layer <NUM> includes a plurality of water swellable yarns 264a-264c helically disposed around the central strength member <NUM> and the first layer of buffer tubes <NUM>. The plurality of water swellable yarns 264a-264c prevents ingression of water inside the core of the optical fiber cable <NUM>. In an embodiment of the present disclosure, the number of water swellable yarns present in the first layer <NUM> is <NUM>. In another embodiment of the present disclosure, the number of water swellable yarns present in the first layer <NUM> is <NUM>. In yet another embodiment of the present disclosure, the number of water swellable yarns present in the first layer <NUM> may vary.

The optical fiber cable <NUM> includes the first layer of plurality of buffer tubes <NUM>. The first layer of plurality of buffer tubes <NUM> are stranded around the first layer <NUM> in a helical fashion. In an embodiment of the present disclosure, the lay length of the first layer of buffer tubes <NUM> is in a range of about <NUM> millimeters - <NUM> millimeters. In general, the lay length is a longitudinal distance along the length of the central strength member <NUM> required for the plurality of buffer tubes to go all the way around the central strength member <NUM>. Each buffer tube of the plurality of buffer tubes <NUM> is same in construction, structure, dimension, color and design as each of the plurality of buffer tubes <NUM> (as mentioned in detailed above in the patent application).

Going further, each of the plurality of buffer tubes <NUM> encloses the plurality of optical fibers <NUM>. In an embodiment of the present disclosure, each of the plurality of buffer tubes <NUM> encloses <NUM> optical fibers. Each of the plurality of buffer tubes <NUM> is a tube for encapsulating the plurality of optical fibers <NUM>. Each of the plurality of optical fibers <NUM> has a diameter of about <NUM> micrometer.

In an embodiment of the present disclosure, a number of the plurality of optical fibers <NUM> in each of the plurality of buffer tubes <NUM> is <NUM>. In an embodiment of the present disclosure, a total number of the plurality of optical fibers <NUM> in the first layer of the plurality of buffer tubes <NUM> is <NUM> (<NUM>* <NUM> = <NUM>), when the number of buffer tubes is <NUM>. Each of the plurality of optical fibers <NUM> has the same color, properties and dimensions as each of the plurality of optical fibers
<NUM> (as explained in detailed above in the patent application). The optical fiber cable <NUM> includes the second layer <NUM>. The second layer <NUM> includes a plurality of water swellable yarns. The plurality of water swellable yarns prevents ingression of water inside the core of the optical fiber cable <NUM>. In addition, the water swellable yarns prevent water penetration along the length of the optical fiber cable <NUM>.

The optical fiber cable <NUM> includes the second layer of plurality of buffer tubes <NUM>. The second layer of plurality of buffer tubes <NUM> is stranded around the second layer <NUM> in a helical fashion. In an embodiment of the present disclosure, the lay length of the second layer of plurality of buffer tubes <NUM> is in a range of about <NUM> millimeters - <NUM> millimeters. In an embodiment of the present disclosure, the second layer of plurality of buffer tubes <NUM> includes <NUM> buffer tubes.

Each buffer tube of the second layer of plurality of buffer tubes <NUM> is same in construction, structure, dimension, color and design as each of the plurality of buffer tubes <NUM> (as mentioned in detailed above in the patent application). Going further, each of the buffer tubes in the second layer of plurality of buffer tubes <NUM> encloses the plurality of optical fibers <NUM>. In addition, each of the buffer tubes in the second layer of plurality of buffer tubes <NUM> encloses <NUM> optical fibers.

In an embodiment of the present disclosure, a number of the plurality of optical fibers <NUM> in each of the plurality of buffer tubes in the second layer of plurality of buffer tubes <NUM> is <NUM>. In an embodiment of the present disclosure, a total number of the plurality of optical fibers <NUM> in the second layer of plurality of buffer tubes <NUM> is <NUM> (<NUM>*<NUM> = <NUM>) when the number of buffer tubes is <NUM>. Each of the plurality of optical fibers <NUM> has the same color, properties and dimensions as the plurality of optical fibers <NUM> (as explained in detailed above in the patent application).

The total number of optical fibers present in the optical fiber cable <NUM> is <NUM> (<NUM>+<NUM> = <NUM>). In another embodiment of the present disclosure, the total number of optical fibers present in the optical fiber cable <NUM> may vary. The optical fiber cable <NUM> includes the third layer <NUM>. The third layer <NUM> is formed of a plurality of binder yarns. The binder yarn is used for binding of the core of the optical fiber cable <NUM>. In an embodiment of the present disclosure, the binder yarn is a normal binder yarn. In another embodiment of the present disclosure, the binder yarn is a low shrinkage binder yarn.

The optical fiber cable <NUM> includes the fourth layer <NUM>. The fourth layer <NUM> includes a plurality of water swellable yarns. The plurality of water swellable yarns prevents ingression of water and moisture inside the core of the optical fiber cable <NUM>. In addition, the plurality of water swellable yarns prevents water penetration along the length of the optical fiber cable <NUM>.

The optical fiber cable <NUM> includes the fifth layer <NUM>. The fifth layer <NUM> is a sheathing layer. In an embodiment of the present disclosure, the fifth layer <NUM> is a sheath formed of at least one of UV proof black medium density polyethylene material and UV proof black high density polyethylene material. The fifth layer <NUM> protects the optical fiber cable <NUM> from harsh environment and harmful UV rays. In an embodiment of the present disclosure, the fifth layer <NUM> has a thickness of about <NUM> millimeter. In addition, the fifth layer <NUM> has the inherent ability to resist crushes, kinks and tensile stress.

The optical fiber cable <NUM> includes the plurality of ripcords 282a-282b. The plurality of ripcords 282a-282b is disposed between the fifth layer <NUM> and the fourth layer <NUM>. In an embodiment of the present disclosure, the plurality of ripcords 282a-282b lies substantially along the longitudinal axis of the optical fiber cable <NUM>. Each of the plurality of ripcords <NUM> facilitates access to the plurality of optical fibers.

In an embodiment of the present disclosure, the optical fiber cable <NUM> may have a suitable diameter. In an embodiment of the present disclosure, the diameter of the optical fiber cable <NUM> is in a range of about <NUM> millimeters ± <NUM> millimeters. In another embodiment of the present disclosure, the diameter of the optical fiber cable <NUM> may vary. In an embodiment of the present disclosure, the weight of the optical fiber cable <NUM> is in a range of about <NUM> ± <NUM> kilogram per kilometer. In_ another embodiment of the present disclosure, the weight of the optical fiber cable <NUM> may vary.

In an embodiment of the present disclosure, the optical fiber cable <NUM> has a maximum operation tensile strength of about <NUM> Newton. In an embodiment of the present disclosure, the optical fiber cable <NUM> has a maximum installation tensile strength of about <NUM> Newton. In an embodiment of the present disclosure, the minimum bending radius of the optical fiber cable <NUM> during installation is <NUM> D and after installation is <NUM> D. In an embodiment of the present disclosure, the crush resistance of the optical fiber cable <NUM> is about <NUM> Newton per <NUM> millimeter. In an embodiment of the present disclosure, the impact strength of the optical fiber cable <NUM> is <NUM> Newton meter. In an embodiment of the present disclosure, the torsion of the optical fiber cable <NUM> is ± <NUM> degree. In an embodiment of the present disclosure, the temperature performance of the optical fiber cable <NUM> during installation is in a range of -<NUM> degree Celsius to <NUM> degree Celsius. In an embodiment of the present disclosure, the temperature performance of the optical fiber cable <NUM> during installation is in a range of -<NUM> degree Celsius to <NUM> degree Celsius. In an embodiment of the present disclosure, the temperature performance of the optical fiber cable <NUM> during service is in a range of -<NUM> degree Celsius to <NUM> degree Celsius. In an embodiment of the present disclosure, the temperature performance of the optical fiber cable <NUM> during storage is in a range of -<NUM> degree Celsius to <NUM> degree Celsius. In another embodiment of the present disclosure, the optical fiber cable <NUM> has any suitable value or range of crush resistance, impact strength, torsion, tensile strength, minimum bending radius and temperature performance.

In an embodiment of the present disclosure, the optical fiber cable <NUM> with <NUM> fibers and average diameter of <NUM> millimeter went through one or more tests to check the blowing performance of the optical fiber cable <NUM>. In another embodiment of the present disclosure, a mini optical fiber cable with <NUM> fibers and average diameter of <NUM> millimeter went through the one or more tests to check the blowing performance of the mini optical fiber cable. In yet another embodiment of the present disclosure, the mini optical fiber cable with <NUM> fibers and average diameter of <NUM> millimetre went through the one or more tests to check the blowing performance of the mini optical fiber cable.

In an embodiment of the present disclosure, each of the three cables has to pass one or more pre-defined criteria of the test. A first pre-defined criterion of the one or more pre-defined criteria is that the cables should blow all the way in the <NUM> meter route. A second pre-defined criterion of the one or more pre-defined criteria is that the route must be completed under <NUM> minutes. A third pre-defined criterion of the one or more pre-defined criteria is to stop the trial when the speed of blowing is below <NUM> meter per minute. A fourth pre-defined criterion of the one or more pre-defined criteria is that the cables should be blown out under <NUM> minutes. A fifth pre-defined criterion of the one or more pre-defined criteria is that no lubricant for the mini cables having less than <NUM> fibers should be used.

In an embodiment of the present disclosure, the track used for the testing of the one or more optical fiber cables includes <NUM> loops. Each loop of the two loops is used to measure <NUM> meter in length providing a total track distance of <NUM> meter. Further, the track includes three end loops and each end loop is equally spaced at <NUM> meter. In addition to the end loop, the track includes <NUM> chambers, <NUM> chambers of which stimulate two road crossings. In an embodiment of the present disclosure, the standard equipment used for the test includes a compressor, a blowing machine, and an air flow meter. The compressor is Kaersar Mobil air Ml <NUM> fitted with an inline air intercooler. The blowing machine is a CBS air stream Cl <NUM>. The air flow meter is a suitable in-line air flow meter. Further, a new unused micro duct is used for each of the one or more cable for the consistency with the test results.

In an embodiment of the present disclosure, one or more blowing equipment was used for the trials. The one or more equipment include a Minijet and a Ml <NUM> compressor. In an embodiment of the present disclosure, the one or more cables were tested at some predefined distance interval to check the blowing performance of the one or more cables.

The first cable for the test includes the optical fiber cable <NUM>. The type of tube used for the optical fiber cable <NUM> is <NUM>/<NUM>. The route used for the optical fiber cable <NUM> includes a distance of <NUM> meter. The number of fiber in the optical fiber cable <NUM> is <NUM>. The data corresponding to the test results of the optical fiber cable <NUM> includes distance, time, speed and air flow of the blowing operation.

The optical fiber cable <NUM> is blown to a distance of <NUM> meter in <NUM> minutes with a speed of <NUM> meter per minute. The optical fiber cable <NUM> is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes. The optical fiber cable <NUM> is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes. The optical fiber cable <NUM> is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The optical fiber cable <NUM> is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The optical fiber cable <NUM> is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The optical fiber cable <NUM> is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The optical fiber cable <NUM> is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The optical fiber cable <NUM> is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The optical fiber cable <NUM> is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The optical fiber cable <NUM> is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The optical fiber cable <NUM> is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The optical fiber cable <NUM> is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The optical fiber cable <NUM> is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The optical fiber cable <NUM> is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The optical fiber cable <NUM> is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The optical fiber cable <NUM> is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The optical fiber cable <NUM> is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The optical fiber cable <NUM> is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The optical fiber cable <NUM> is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The optical fiber cable <NUM> is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The optical fiber cable <NUM> is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The optical fiber cable <NUM> is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The optical fiber cable <NUM> is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The optical fiber cable <NUM> is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The optical fiber cable <NUM> is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The optical fiber cable <NUM> is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The optical fiber cable <NUM> is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The optical fiber cable <NUM> is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The optical fiber cable <NUM> is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The optical fiber cable <NUM> is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of 52meter per minutes with an air flow of <NUM> bar. The optical fiber cable <NUM> is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The optical fiber cable <NUM> is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The optical fiber cable <NUM> is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The optical fiber cable <NUM> is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The optical fiber cable <NUM> is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The optical fiber cable <NUM> is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar.

The optical fiber cable <NUM> passed the test. The average speed calculated for blowing the optical fiber cable <NUM> was <NUM> meter per minute.

The second cable for the test includes the mini optical fiber cable. The type of tube used for the mini optical fiber cable is <NUM>/<NUM>. The route used for the mini optical fiber cable includes a distance of <NUM> meter. The number of fiber in the mini optical fiber cable is <NUM>. The data corresponding to the test results of the mini optical fiber cable includes distance, time, speed and air flow of the blowing operation.

The mini optical fiber cable is blown to a distance of <NUM> meter in <NUM> minutes with a speed of <NUM> meter per minute. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with art air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes. with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of 13bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar.

The mini optical fiber cable with <NUM> fibers failed the test. The mini optical fiber cable failed in the test due to the slow speed. The average speed calculated for blowing the mini optical fiber cable was <NUM> meter per minute.

The third cable for the test includes the mini optical fiber cable. The type of tube used for the mini optical fiber cable is <NUM>/<NUM>. The route used for the mini optical fiber cable includes a distance of <NUM> meter. The number of fiber in the mini optical fiber cable is <NUM>. The data corresponding to the test results of the mini optical fiber cable includes distance, time, speed and air flow of the blowing operation.

The mini optical fiber cable is blown to a distance of <NUM> meter in <NUM> minutes with a speed of <NUM> meter per minute. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes. with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes. with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of <NUM> bar. The mini optical fiber cable is blown to the next distance from <NUM> meter to <NUM> meter in <NUM> minutes with the speed of <NUM> meter per minutes with an air flow of 13bar.

The mini optical fiber cable with <NUM> fibers passed the test. The average speed calculated for blowing the mini optical fiber cable was <NUM> meter per minute.

It may be noted in reference with the above mentioned embodiments, performance and test results of <NUM> fiber optical fiber cable <NUM> (<FIG>) (included above as part of table - <NUM>, table -<NUM> and table -<NUM> embodiments) that the <NUM> fiber optical fiber cable <NUM> (<FIG>) shows similar blowing performance results as <NUM> fiber optical fiber cable <NUM>. The blowing performance of <NUM> fiber optical fiber cable <NUM> is similarly optimized as <NUM> fiber optical fiber cable <NUM>. Further, those skilled in the art would appreciate that the <NUM> fiber optical fiber cable <NUM> (<FIG>) is similarly optimized as <NUM> fiber optical fiber cable <NUM> (<FIG>) as both the optical fiber cable (<NUM>, <NUM>) use similar dual layer buffer tubes.

Further, it may be noted that in <FIG>, the optical fiber cable <NUM> includes eight buffer tubes; and in other embodiment, the optical fiber cable <NUM> includes twenty four buffer tubes; however, those skilled in the art would appreciate that more or less number of buffer tubes are included in the optical fiber cable <NUM>.

The micro optical fiber cable has numerous advantages over the prior art. The micro optical fiber cable is easy to install in small ducts. The optical fiber cable includes a dual layer of buffer tubes with low thickness of polycarbonate and polybutylene terephthalate. The dual layer buffer tubes can be used for other configurations with <NUM> micrometer optical fibers and <NUM> micrometer optical fibers to reduce cable diameter which in tum improves the blowing performance. The small diameter of optical fiber cable enables easier installation of the micro optical fiber cable in the small ducts. Further, the small diameter increases the blowing performance of the micro optical fiber cable.

Claim 1:
An optical fiber cable (<NUM>) comprising:
a central strength member (<NUM>) lying substantially along a longitudinal axis of the optical fiber cable (<NUM>);
a first layer (<NUM>) wrapped helically around the central strength member (<NUM>), wherein the first layer (<NUM>) includes a plurality of water swellable yarns (164a-164c); a plurality of buffer tubes (<NUM>) stranded helically around the first layer (<NUM>), each of the plurality of buffer tubes (<NUM>) is formed of a combination of two sub layers having different material;
a second layer (<NUM>) surrounds the plurality of buffer tubes (<NUM>), wherein the second layer (<NUM>) cross helically surrounds a core of the optical fiber cable (<NUM>);
a third layer (<NUM>) wrapped helically around the core of the optical fiber cable (<NUM>); and
a fourth layer (<NUM>) surrounding the third layer (<NUM>),
characterized in that
the central strength member (<NUM>) is formed of fiber reinforced plastic, the central strength member (<NUM>) has a diameter of <NUM>, wherein the two sub layers include a first sub layer and a second sub layer; the first sub layer is formed of polycarbonate, the second sub layer is formed of polybutylene terephthalate, each of the plurality of buffer tubes (<NUM>) encloses a plurality of optical fibers (<NUM>), the second layer (<NUM>) is formed of a pair of binder yarns the pair of binder yarns comprising:
a first binder yarn wrapped helically in clockwise direction; and
a second binder yarn wrapped helically in anti-clockwise direction,
the third layer (<NUM>) is formed of a plurality of water swellable yarns, the fourth layer (<NUM>) is formed of high density polyethylene, the optical fiber cable (<NUM>) has a diameter of <NUM> ± <NUM>.