Abstract:
A connection structure and a method are provided for being able to make the signal of multi-mode fiber accepted by the single-mode fiber or to make the signal of single-mode fiber accepted by the multi-mode fiber. The present invention uses the core of the cladding of the single-mode fiber corresponding to that of multi-mode fiber in end-to-end relationship or uses the cladding of the single-mode fiber connects with that of multi-mode fiber in side-to-side relationship. Therefore, for users, it will not be necessary to use light-electricity converter between single-mode fiber and multi-mode fiber. In this way, the present invention can help to save the material cost and simplify the arrangement of the transmission line.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to a connection structure, or connector and a method able to make the signals transmit between multi-mode and single-mode fibers. 
         [0003]    2. Description of Related Art 
         [0004]    With the progressing high-speed voice and data communication era, optical fiber communication is indispensable communication technology for modern people. Generally speaking, the basic structure of optical fiber, fiber, optical fiber from inside to outside is divided into three distinct regions: a core, a cladding, and a coating. The optical fiber can be categorized generally as multi-mode fiber and single-mode fiber by how the optical fiber transmits the beam. 
         [0005]    Please refer to  FIG. 1A  and  FIG. 1B , generally speaking, the diameter of the core  1   a  of the multi-mode fiber is around 50 micrometer (μm). The diameter of the cladding  1   b , which surrounds the core  1   a , is around 125 μm. A beam/light  1   c  transmitting in the core  1   a  results in mode dispersion, as the beam  1   c  transmits in  FIG. 1B . Therefore, the multi-mode fiber is suitable for short-distance transmission. 
         [0006]    Please refer to  FIG. 2A  and  FIG. 2B , generally speaking, the diameter of the core  2   a  of the single-mode fiber is around 9 μm. The diameter of the cladding  2   b , which surrounds the core  2   a , is around 125 μm. A beam  2   c  transmitting in the core  2   a  does not result in serious mode dispersion, as shown in the beam  2   c  transmits in  FIG. 2B . Therefore, the single-mode fiber is suitable for long-distance transmission. 
         [0007]    The difference between multi-mode fiber and single-mode fiber relies on the way the beam transmits in the core. The diameters of the cores corresponding to multi-mode fiber or single-mode fiber are generally only a common situation but not necessarily limited. The difference between multi-mode fiber and single-mode fiber lies in the way to polish and the incident angle of the beam entering the core. Additionally, regarding the male connector, it is common to surround a layer of ferro (i.e. a kind of ceramics) on the outside of the cladding for insertion. 
         [0008]    To gain understanding signal generation for long-distance and conversion or reconversion between an electrical and optical wave transmission, please refer to  FIG. 3 , which displays a block diagram concerning to the multi-mode fiber and single-mode fiber application. A emitting terminal  3   a  emits a beam to a multi-mode fiber  3   b ; the beam transmits from the multi-mode fiber  3   b  to a first media converter  3   c ; the first media converter  3   c  transforms the beam into the electrical signal; the first media converter  3   c  further transforms the electrical signal into a beam which is available to transmit in a single-mode fiber  3   d . The procedure just mentioned above was carried out in an indoor environment. The beam next transmits through the single-mode fiber  3   d  outdoors; the beam transmits to a second media converter  3   e ; the second media converter  3   e  transforms the beam into the electrical signal; the second media converter  3   e  further transforms the electrical signal into the beam which is applicable to transmit in a multi-mode fiber  3   f . The beam finally transmits to a receiving terminal  3   g , which processes in indoors. The receiving terminal  3   g  can transmit the signal to the emitting terminal  3   a  by a similar method. 
         [0009]    However, the transformation among the multi-mode fiber  3   b ,  3   f  and the single-mode  3   d  needs the first media converter  3   c  and the second media converter  3   e . In that way, users and/or suppliers need a lot of facilities whose cost is significant. 
         [0010]    This inventor recognizes that the drawback is resolvable/solvable/. The inventor use his experience to contrive a reasonable invention to improve the drawback mentioned above. 
       SUMMARY OF THE INVENTION 
       [0011]    The main object of the present invention is to provide a connection structure and a method able to make the signals transmit between multi-mode and single-mode fibers, simplifying the arrangement of the transmission line and the facilities to reduce cost. 
         [0012]    To attain the object mentioned above, as seen in the accompanying exemplary drawings, the present invention provides a connection structure able to make the signals transmit between multi-mode and single-mode fibers, comprising: a multi-mode male connector having a multi-mode column, the multi-mode column from inside to outside is divided into three distinct regions: a core, a cladding, and a ferro; a single-mode male connector having a single-mode column, the multi-mode column from inside to outside is divided into three distinct regions: a core, a cladding, and a ferro; and a female connector having an engaging portion; the multi-mode column and the single-mode column were further inserted into the two sides of the engaging portion, the core of the multi-mode column is corresponding to the core of the single-mode column. 
         [0013]    The present invention further provides a female connector able to make the signals transmit between multi-mode and single-mode fibers, comprising: an engaging portion and a transferring portion, the transferring column is located in the engaging portion, the transferring column from inside to outside is divided into three distinct regions: a core, a cladding, and a ferro. 
         [0014]    Then, the present invention further provides a method able to make the signals transmit between multi-mode and single-mode fibers, comprising following steps: (A) Offering a cladding of a multi-mode fiber; (B) Offering a cladding of a single-mode fiber; and (C) Connecting the cladding of the multi-mode fiber and the cladding of the single-mode fiber in side-to-side. 
         [0015]    The present invention has many merits. People can use the core of the cladding of the single-mode fiber corresponding to that of multi-mode fiber in end-to-end relationship or uses the cladding of the single-mode fiber connects with that of multi-mode fiber in side-to-side relationship. It is unnecessarily to use media converters but connect the single-mode fiber and multi-mode fiber directly. Therefore, the present invention is helpful to save the material cost and simplify the arrangement of the transmission line. 
         [0016]    To further understand the techniques, means, and effects the present invention applies for achieving the prescribed objectives, the following detailed description and appended drawings are hereby referenced, such that and through which, the purposes, features, and aspects of the present invention may be thoroughly and concretely appreciated; however, the appended drawings are merely provided for reference, illustration, and convenience, without intending any limitation of the true scope of the present invention. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0017]      FIG. 1A  is a sectional view of the core and cladding of a multi-mode fiber in prior art; 
           [0018]      FIG. 1B  is a schematic view of the optical beam transmitting in the core and the cladding of the multi-mode fiber in prior art; 
           [0019]      FIG. 2A  is a sectional view of the core and cladding of a single-mode fiber in the prior art; 
           [0020]      FIG. 2B  is a schematic view of the optical beam transmitting in the core and the cladding of the single-mode fiber in the prior art; 
           [0021]      FIG. 3  is a block diagram of the prior art; 
           [0022]      FIG. 4  is a perspective view of the first embodiment of the present invention; 
           [0023]      FIG. 5A  is a partial and sectional view of the first embodiment of the present invention; 
           [0024]      FIG. 5B  is a partial enlargement view of  FIG. 5A ; 
           [0025]      FIG. 6A  is a partial and sectional view of the second embodiment of the present invention; 
           [0026]      FIG. 6B  is a partial enlargement view of  FIG. 6A ; 
           [0027]      FIG. 7  is a schematic view of the third embodiment, a multi-mode fiber and a single-mode fiber connect side-to-side method, of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0028]    The present invention offers a connection structure and a method able to make the signals transmit between multi-mode and single-mode fibers. 
         [0029]    Please refer to  FIG. 4  to  FIG. 5A ,  5 B, the figures of the first embodiment. In the embodiment, the invention provides a connection structure able to make the signals transmit between multi-mode and single-mode fibers. The connection structure comprises a multi-mode male connector  1 , a single-mode male connector  2  and a female connector  3 . The multi-mode male connector  1  and the single-mode male connector  2  are inserted into two sides of the female connector  3 . 
         [0030]    The multi-mode male connector  1  has a shell  11 , a surrounding portion  12 , and a multi-mode column  13 . 
         [0031]    The shell  11  is a colloid with hollow. The shell  11  has a key  111  on its side. The key  111  is plate-shaped. The surrounding portion  12  is located in the shell  11 . An end of the surrounding portion  12  is concave. A bottom of the end of surrounding portion  12  protrudes the multi-mode column  13 . The multi-mode column  13  from inside to outside is divided into three distinct regions: a core  131 , a cladding  132 , and a ferro  133 . 
         [0032]    The single-mode male connector  2  has a shell  21 , a surrounding portion  22 , and a single-mode column  23 . 
         [0033]    The shell  21  is a colloid with hollow. The shell  21  has a key  211  on its side. The key  211  is plate-shaped. The surrounding portion  22  is located in the shell  21 . An end of surrounding portion  22  is concave. A bottom of the end of surrounding portion  22  protrudes the single-mode column  23 . The single-mode column  23  from inside to outside is divided into three distinct regions: a core  231 , a cladding  232 , and a ferro  233 . An end of the cladding  232  has a guiding portion  2321 , letting the diameter of the core  231  become comparably larger in the end. 
         [0034]    The female connector  3  necessarily includes a housing  31  and an engaging portion  32 . Two ends of the housing  31  locates have two keyways  311 . The two keyways  311  accommodate the key  111  of the multi-mode male connector  1  and the key  211  of the single-mode male connector  2 . The engaging portion  32  which is sleeve-like is located in the female connector  3 . When the multi-mode male connector  1  and the single-mode male connector  2  are inserted into each of the two sides of the female connector  3 , the multi-mode column  13  and the single-mode column  23  are further inserted into the two sides of the engaging portion  32 . The end of multi-mode column  13  and the end single-mode column  23  contact with each other. The location of the core  131  is corresponding to that of the core  231 . Because the end of the cladding  232  settled a guiding portion  2321 , letting the core  131  and the core  231  in the interface with less difference in diameter. 
         [0035]    A beam  4  can be reflected in the core  131  and transmitted into the end of the core  231 , and the beam  4  can also be reflected in the core  231  and transmitted into the end of the core  131 . In this way, the facilities, such as the first and the second media converters in convention can be obviated. 
         [0036]    In the embodiment, the method able to make the signals transmit between multi-mode and single-mode fibers is described as follows: 
         [0037]    (A) Providing a multi-mode male connector  1 , the multi-mode male connector  1  has a multi-mode column  13 . The multi-mode column  13  from inside to outside is divided into three distinct regions: a core  131 , a cladding  132 , and a ferro  133 . 
         [0038]    (B) Providing a single-mode male connector  2 , the single-mode male connector  2  has a single-mode column  23 . The single-mode column  23  from inside to outside is divided into three distinct regions: a core  231 , a cladding  232 , and a ferro  233 . 
         [0039]    (C) Providing a female connector  3 , the female connector  3  has an engaging portion  32 . 
         [0040]    (D) Inserting the multi-mode male connector  1  and the single-mode male connector  2  into two sides of the female connector  3 , wherein the multi-mode column  13  and the single-mode column  23  are inserted into two sides of the engaging portion  32 , so that the location of the core  131  is corresponding to that of the core  231 . 
         [0041]    Please refer to  FIG. 4  and  FIG. 6A ,  6 B, the figures of the second embodiment. In the embodiment, the invention offers another connection structure able to make the signals transmit between multi-mode and single-mode fibers. The main differences between the first embodiment and the second embodiment are that the cladding  232  in second embodiment is unnecessarily to locate a guiding portion  2321  and the female connector  3  further includes a transferring column  33 . 
         [0042]    In the embodiment, the transferring column  33  is located in the engaging portion  32  of the female connector  3 . The length of the engaging portion  32  is longer than the length of the transferring column  33 . The multi-mode male connector  1  and the single-mode male connector  2  are still inserted into the two sides of the female connector  3 . The transferring column  33 , from inside to outside, is divided into three distinct regions: a core  331 , a cladding  332 , and a ferro  333 . In the embodiment, the optical fiber of the transferring column  33  is single-mode fiber. The transferring column  33  is located between the multi-mode column  13  and the single-mode column  23 . One end of the transferring column  33  contacts the multi-mode column  13  and the other end of the transferring column  33  contacts the single-mode column  23 . 
         [0043]    One end of the core  331  of the transferring column  33  is corresponding to the core  131  of the multi-mode column  13 . One end of the cladding  332  of the transferring column  33  is located at a guiding portion  3321 , such as by creation of a chamfer or other guiding means. The other end of the core  331  of the transferring column  33  is corresponding to the core  231  of the single-mode column  23 . 
         [0044]    In the embodiment, the connection structure and the method that are able to make the signals transmit between multi-mode and single-mode fibers are similar to the first embodiment. The difference is that the female connector  3  has the transferring column  33 , which is located between the multi-mode column  13  and the single-mode column  23 . 
         [0045]    “Corresponding” mentioned above means that the multi-mode fibers and the single-mode fibers are in functional proximity such that transmittance from one to the other is successful with no more than acceptable signal loss. 
         [0046]    Besides the end-to-end relationship between the multi-mode fiber and the single-mode fiber to transmit the beam/signal, the invention further includes another way. Please refer to  FIG. 7 , where the third embodiment of the present invention is shown. 
         [0047]    In the third embodiment, the invention offers another connection structure able to make the signals transmit between the multi-mode and single-mode fibers. Compared with the first and second embodiment, the cladding  132  of the multi-mode fiber and the cladding  232  of the single-mode fiber are not connected with end-to-end form. The side of the cladding  132  is connected with the side of the cladding  232 . Since the cladding  132  and the cladding  232  are transparent material, the beam/signal can transmit from the cladding  132  to the cladding  232  when the cladding  132  and the cladding  232  overlap with each other. Similarly, the beam/signal can transmit from the cladding  232  to the cladding  132 . 
         [0048]    The invention offers another connection method able to make the signals transmit between the multi-mode and single-mode fibers. The cladding  132  and the cladding  232  are connected with each other by melted in side-to-side. 
         [0049]    To sum up, the present invention applies end-to-end relationship corresponding or melted in side-to-side for the multi-mode and single-mode connection. The methods are helpful to obviate the media converters and help the signal to transmit directly. The present invention helps obviate extra cost. 
         [0050]    The above-mentioned descriptions represent merely the preferred embodiment of the present invention, without any intention to limit the scope of the present invention thereto. Various equivalent changes, alternations or modifications based on the claims of present invention are all consequently viewed as being embraced by the scope of the present invention.