Source: http://www.google.com/patents/US20090279835?dq=6437692
Timestamp: 2014-03-15 02:17:33
Document Index: 135313012

Matched Legal Cases: ['Application No. 1', 'Application No. 1', 'Application No. 60', 'Application No. 61', 'Application No. 61', 'Application No. 61', 'Application No. 61', 'Application No. 61']

Patent US20090279835 - Single-Mode Optical Fiber Having Reduced Bending Losses - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA single-mode optical fiber includes a central core, an intermediate cladding, a depressed trench, and an external optical cladding. The central core has a radius r1 and a positive refractive index difference Δn1 with the optical cladding. The intermediate cladding has a radius r2 and a positive refractive...http://www.google.com/patents/US20090279835?utm_source=gb-gplus-sharePatent US20090279835 - Single-Mode Optical Fiber Having Reduced Bending LossesAdvanced Patent SearchPublication numberUS20090279835 A1Publication typeApplicationApplication numberUS 12/436,423Publication dateNov 12, 2009Filing dateMay 6, 2009Priority dateMay 6, 2008Also published asCN101576631A, CN101576631B, CN101587204A, CN101587204B, EP2116877A1, EP2116877B1, EP2116878A1, EP2116878B1, US7889960, US8131125, US8145025, US8428414, US20090279836, US20110135264, US20120183268Publication number12436423, 436423, US 2009/0279835 A1, US 2009/279835 A1, US 20090279835 A1, US 20090279835A1, US 2009279835 A1, US 2009279835A1, US-A1-20090279835, US-A1-2009279835, US2009/0279835A1, US2009/279835A1, US20090279835 A1, US20090279835A1, US2009279835 A1, US2009279835A1InventorsLouis-Anne de Montmorillon, Simon Richard, Denis Molin, David Boivin, Marianne Bigot-Astruc, Pierre SillardOriginal AssigneeDraka Comteq B.V.Export CitationBiBTeX, EndNote, RefManReferenced by (25), Classifications (5), Legal Events (1) External Links: USPTO, USPTO Assignment, EspacenetSingle-Mode Optical Fiber Having Reduced Bending LossesUS 20090279835 A1Abstract A single-mode optical fiber includes a central core, an intermediate cladding, a depressed trench, and an external optical cladding. The central core has a radius r1 and a positive refractive index difference Δn1 with the optical cladding. The intermediate cladding has a radius r2 and a positive refractive index difference Δn2 with the optical cladding, wherein Δn2 is less than Δn1. The depressed trench has a radius r3 and a negative index difference Δn3 with the optical cladding. At a wavelength of 1310 nanometers, the optical fiber has a mode field diameter (MFD) between 8.6 microns and 9.5 microns and, at a wavelength of 1550 nanometers, the optical fiber has bending losses less than about 0.25�10−3 dB/turn for a radius of curvature of 15 millimeters. At a wavelength of 1260 nanometers, attenuation of the LP11 mode to 19.3 dB is achieved over less than 90 meters of fiber.
a central core surrounded by an outer cladding, the central core having a radius r1 and a positive refractive index difference Δn1 with the optical cladding; an intermediate cladding positioned between the central core and the outer cladding, the intermediate cladding having a radius r2 and a positive refractive index difference Δn2 with the optical cladding, wherein the refractive index difference Δn2 is less than the refractive index difference Δn1; a depressed trench positioned between the intermediate cladding and the outer cladding, the depressed trench having a radius r3 and a negative refractive index difference Δn3 with the optical cladding; wherein, at a wavelength of 1310 nanometers, the optical fiber has a mode field diameter (MFD) between 8.6 microns and 9.5 microns; wherein, at a wavelength of 1550 nanometers, the optical fiber has bending losses less than 0.25�10−3 dB/turn for a radius of curvature of 15 millimeters; and wherein, at a wavelength of 1260 nanometers, the LP11 mode of the optical fiber is attenuated to 19.3 dB at a length less than 90 meters. 2. The optical fiber according to claim 1, wherein the surface integral of the central core (V01), defined as
V 01 = ∫ 0 r   1  Δ   n  ( r ) �   r ≈ r 1 � Δ   n 1 , is between 20.0�10−3 micron and 23.0�10−3 micron.
V 03 = ∫ r   2 r   3  Δ   n  ( r ) �   r ≈ ( r 3 - r 2 ) � Δ   n 3 , is between −55.0�10−3 micron and −30.0�10−3 micron.
V 13 = 2 � ∫ r   2 r   3  Δ   n  ( r ) �  r �  r ≈ ( r 3 2 - r 2 2 ) � Δ   n 3 , is between −1200�10−3 μm2 and −750�10−3 μm2.
22. The optical fiber according to claim 1, wherein the central core has a refractive index difference (Δn1) with the optical cladding between 5.3�10−3 and 5.7�10−3.
23. The optical fiber according to claim 1, wherein the intermediate cladding has a refractive index difference (Δn2) with the optical cladding between 0.1�10−3 and 0.6�10−3.
24. The optical fiber according to claim 1, wherein the depressed trench has a refractive index difference (Δn3) with the optical cladding between −10.0�10−3 and −5.0�10−3.
26. The optical fiber according to claim 1, wherein the optical fiber has a zero chromatic dispersion slope value (ZDS) at the chromatic zero dispersion wavelength less than 0.092 ps/(nm2�km).
a central core surrounded by an outer cladding, the central core having a radius r1 and a refractive index difference Δn1 with the optical cladding between about 5.3�10−3 and 5.7�10−3; an intermediate cladding positioned between the central core and the outer cladding, the intermediate cladding having a radius r2 and a refractive index difference Δn2 with the optical cladding between about 0.1�10−3 and 0.6�10−3; a depressed trench positioned between the intermediate cladding and the outer cladding, the depressed trench having a radius r3 and a refractive index difference Δn3 with the optical cladding between about −10.0�10−3 and −5.0�10−3; wherein, at a wavelength of 1310 nanometers, the optical fiber has a mode field diameter (MFD) between about 8.6 microns and 9.5 microns; wherein the optical fiber has a zero chromatic dispersion wavelength (ZDW) between 1300 nanometers and 1324 nanometers; wherein the optical fiber has a zero chromatic dispersion slope value (ZDS) at the chromatic zero dispersion wavelength less than 0.092 ps/(nm2�km); and wherein, at a wavelength of 1260 nanometers, the LP11 mode of the optical fiber is attenuated to 19.3 dB at a length less than 90 meters. 34. The optical fiber according to claim 33, wherein:
the surface integral of the central core (V01), defined as V 01 = ∫ 0 r   1  Δ   n  ( r ) �   r ≈ r 1 � Δ   n 1 , is between 20.0�10−3 micron and 23.0�10−3 micron;
V 03 = ∫ r   2 r   3  Δ   n  ( r ) �   r ≈ ( r 3 - r 2 ) � Δ   n 3 , is between −55.0�10−3 micron and −30.0�10−3 micron; and
Commonly assigned U.S. Patent Application Publication No. US2007/0280615 (and its counterpart European Patent Application No. 1,845,399) and U.S. Patent Application Publication No. US2007/0127878 (and its counterpart European Patent Application No. 1,785,754) propose fiber profiles having limited bending losses, corresponding in particular to the criteria of the G.657A and G.657B standards. The profiles described in these European patent applications, however, make it possible to achieve only the bending loss limits imposed by the G.657B standard.
V 01 = ∫ 0 r   1  Δ   n  ( r ) �   r ≈ r 1 � Δ   n 1 , is between about 20.0�10−3 micron and 23.0�10−3 micron.
V 03 = ∫ r   2 r   3  Δ   n  ( r ) �   r ≈ ( r 3 - r 2 ) � Δ   n 3 , is between about −55.0�10−3 micron and −30.0�10−3 micron.
V 13 = 2 � ∫ r   2 r   3  Δ   n  ( r ) �  r �  r ≈ ( r 3 2 - r 2 2 ) � Δ   n 3 , is between about −1200�10−3 μm2 and −750�10−3 μm2.
V 01 = ∫ 0 r   1  Δ   n  ( r ) �   r ≈ r 1 � Δ   n 1 V 02 = ∫ r   1 r   2  Δ   n  ( r ) �   r ≈ ( r 2 - r 1 ) � Δ   n 2 V 03 = ∫ r   2 r   3  Δ   n  ( r ) �   r ≈ ( r 3 - r 2 ) � Δ   n 3 . Similarly, it is possible to define three volume integrals for the optical fiber (10) of the invention, representative of the volume of the core V11, the volume of the intermediate cladding V12, and the volume of the depressed trench V13. The expression �volume� should not be understood geometrically but rather as corresponding to a value taking three dimensions into account. These three volume integrals can be expressed as follows:
V 11 = 2 � ∫ 0 r   1  Δ   n  ( r ) �  r �  r ≈ r 1 2 � Δ   n 1 V 12 = 2 � ∫ r   1 r   2  Δ   n  ( r ) �  r �  r ≈ ( r 2 2 - r 1 2 ) � Δ   n 2   V 13 = 2 � ∫ r   2 r   3  Δ   n  ( r ) �  r �  r ≈ ( r 3 2 - r 2 2 ) � Δ   n 3 . Unless otherwise noted, the examples presented in the following Tables I-IV are predictive simulations. In this regard, Table I (below) shows 30 prophetic examples of fiber profiles according to exemplary embodiments of the invention in comparison with three SSMF fiber profiles and one fiber profile corresponding to the G.657A and G.657B standards (noted as �BIF� for Bend Insensitive Fiber). Draka Comteq markets a bend insensitive fiber having a good resistance to bending losses under the trademark BendBrightXS�. The values in the tables correspond to the set profiles for each fiber.
On the other hand, as shown by Table III (below), the fiber has an effective cut-off wavelength λceff greater than 1350 nanometers. As discussed, the cut-off wavelength is measured as being the wavelength at which the optical signal is no longer single mode after propagation over two meters of fiber, as defined by Subcommittee 86A of the International Electrotechnical Commission in the IEC 60793-1-44 standard.
The column �LP11 LL@1260 after 22 m� indicates the leakage losses of the LP11 mode after propagation over 22 meters of virtually straight fiber.
The column �Length-19.3 dB LP11 LL@1260 nm� indicates the length of fiber required to achieve leakage losses of the LP11 mode equal to 19.3 dB with the fiber being kept virtually straight. This indicates at which distance the fiber, arranged virtually straight, is single mode within the meaning of the G.652 and G.657 standards.
Accordingly, this application incorporates entirely by reference the following commonly assigned patent applications: U.S. Patent Application No. 60/986,737 for a Microbend-Resistant Optical Fiber, filed Nov. 9, 2007, (Overton); U.S. Patent Application No. 61/041,484 for a Microbend-Resistant Optical Fiber, filed Apr. 1, 2008, (Overton); U.S. Patent Application No. 61/112,595 for a Microbend-Resistant Optical Fiber, filed Nov. 7, 2008, (Overton); International Patent Application No. PCT/U.S.08/82927 Microbend-Resistant Optical Fiber, filed Nov. 9, 2008, (Overton); and U.S. patent application Ser. No. 12/267,732 for a Microbend-Resistant Optical Fiber, filed Nov. 10, 2008, (Overton).
This application further incorporates entirely by reference the following commonly assigned patents, patent application publications, and patent applications, each of which discusses optical fibers: U.S. Pat. No. 4,838,643 for a Single Mode Bend Insensitive Fiber for Use in Fiber Optic Guidance Applications (Hodges et al.); U.S. Patent Application Publication No. US2007/0127878 A1 and its related U.S. patent application Ser. No. 11/556,895 for a Single Mode Optical Fiber (de Montmorillon et al.); U.S. Patent Application Publication No. US2007/0280615 A1 and its related U.S. patent application Ser. No. 11/697,994 for a Single-Mode Optical Fiber (de Montmorillon et al.); U.S. Pat. No. 7,356,234 for Chromatic Dispersion Compensating Fiber (de Montmorillon et al.); U.S. Pat. No. 7,483,613 for Chromatic Dispersion Compensating Fiber (de Montmorillon et al.); U.S. Patent Application Publication No. US2008/0152288 A1 and its related U.S. patent application Ser. No. 11/999,333 for an Optical Fiber (Flammer et al.); U.S. patent application Ser. No. 12/098,804 for Transmission Optical Fiber Having Large Effective Area (Sillard et al.); U.S. patent application Ser. No. 12/418,523 for Dispersion-Shifted Optical Fiber (Sillard et al.); U.S. Patent Application No. 61/101,337 for a Bend-Insensitive Optical Fiber, filed Sep. 30, 2008, (de Montmorillon et al.); U.S. Patent Application No. 61/112,006 for a Bend-Insensitive Single-Mode Optical Fiber, filed Nov. 6, 2008, (de Montmorillon et al.); U.S. Patent Application No. 61/112,374 for a Bend-Insensitive Single-Mode Optical Fiber, filed Nov. 7, 2008, (de Montmorillon et al.); and U.S. patent application Ser. No. ______ for a Bend-Insensitive Single Mode Optical Fiber, concurrently filed May 6, 2009, (de Montmorillon et al.)
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