公开(公告)号：US06347174B1

公开(公告)日：2002-02-12

申请号：US09297173

申请日：1999-07-06

申请人： Masashi Onishi ,  Toshiaki Okuno ,  Shinji Ishikawa ,  Tomonori Kashiwada ,  Masayuki Nishimura

发明人： Masashi Onishi ,  Toshiaki Okuno ,  Shinji Ishikawa ,  Tomonori Kashiwada ,  Masayuki Nishimura

IPC分类号： H04N591

CPC分类号： G02B6/03644 ,  G02B6/02028 ,  G02B6/02242 ,  G02B6/02276 ,  G02B6/0228 ,  G02B6/03627 ,  G02B6/03655 ,  G02B6/105 ,  G02F1/383

摘要： The present invention relates to a nonlinear optical fiber which can generate a nonlinear optical phenomenon with high efficiency, an optical fiber coil wound with the nonlinear optical fiber, and a wavelength converter equipped with the nonlinear optical fiber. In particular, the nonlinear optical fiber according to the present invention has, as characteristics with respect to input light having a predetermined wavelength, a mode field diameter of 5 &mgr;m or less, a polarization mode dispersion of 1 ps/km½ or less or a fixed plane of polarization, a zero-dispersion wavelength of not less than 1.5 &mgr;m but not greater than 1.6 &mgr;m, a cutoff wavelength of not less than 1.4 &mgr;m but not greater than 1.7 &mgr;m at a length of 2 m, a transmission loss of 3 dB/km or less, and a nonlinear coefficient of 10/W/km or more. As a result of this configuration, the nonlinear optical fiber generates, with high efficiency, desirable converted light occurring upon the nonlinear phenomenon.

摘要翻译： 本发明涉及一种能够高效率地产生非线性光学现象的非线性光纤，与非线性光纤缠绕的光纤线圈以及配备非线性光纤的波长转换器。 特别地，根据本发明的非线性光纤作为具有预定波长的输入光的特性，模场直径为5um以下，偏振模色散为1ps / km 1/2以下或固定 偏振平面，零分散波长不小于1.5μm但不大于1.6μm，截止波长不小于1.4μm，但不大于1.7μm，长度为2μm，传输损耗为3dB / km以下，非线性系数为10 / W / km以上。 作为该结构的结果，非线性光纤以非线性现象产生期望的转换光，高效率地产生。

公开(公告)号：USRE38086E1

公开(公告)日：2003-04-22

申请号：US09714615

申请日：2000-11-17

申请人： Masashi Onishi ,  Hiroo Kanamori ,  Masayuki Nishimura ,  Tomonori Kashiwada ,  Yasushi Koyano

发明人： Masashi Onishi ,  Hiroo Kanamori ,  Masayuki Nishimura ,  Tomonori Kashiwada ,  Yasushi Koyano

IPC分类号： G02B616

CPC分类号： G02B6/02261 ,  C03B37/014 ,  C03B2203/22 ,  C03B2203/36 ,  G02B6/02004 ,  G02B6/0228 ,  G02B6/02285 ,  G02B6/0281 ,  G02B6/0283 ,  G02B6/0286 ,  G02B6/03611 ,  G02B6/03627 ,  G02B6/03644 ,  G02B6/29377 ,  H01S3/06729 ,  H01S3/302

摘要： The present invention relates to a dispersion compensating fiber for improving a transmission system with it in total chromatic dispersion and dispersion slope in the 1.55 &mgr;m wavelength band. The dispersion compensating fiber according to the present invention is characterized by having the following characteristics for light in the 1.55 &mgr;m wavelength band: chromatic dispersion not less than −40 ps/km/nm and not more than 0 ps/km/nm; dispersion slope not less than −0.5 ps/km/nm2 and not more than −0.1 ps/km/nm2; transmission loss not more than 0.5 dB/km; polarization mode dispersion not more than 0.7 ps.km−½; mode field diameter not less than 4.5 &mgr;m and not more than 6.5 &mgr;m; cut-off wavelength not less than 0.7 &mgr;m and not more than 1.7 &mgr;m in the length of 2 m; and bending loss at the diameter of 20 mm, not more than 100 dB/m. The dispersion compensating fiber is optically connected with a dispersion shifted fiber as a compensated object at a ratio of appropriate lengths, which can improve the system including the dispersion compensating fiber in the total chromatic dispersion and dispersion slope of the system in the 1.55 &mgr;m band.

摘要翻译： 本发明涉及一种用于改善传输系统的色散补偿光纤在1.55μm波长带中的总色散和色散斜率。 根据本发明的色散补偿光纤的特征在于对于1.55μm波长带中的光具有以下特性：色散不小于-40ps / km / nm且不大于0ps / km / nm; 色散斜率不小于-0.5 ps / km / nm2，不大于-0.1 ps / km / nm2; 传输损耗不超过0.5 dB / km; 偏振模色散不大于0.7 ps.km-½; 模场直径不小于4.5μm，不大于6.5μm; 截止波长不小于0.7μm和不大于1.7μm，长度为2μm; 弯曲损耗为20mm，不大于100dB / m。 色散补偿光纤以适当长度的比率与作为补偿对象的色散位移光纤光学连接，这可以改善包括色散补偿光纤在1.55mum带中的系统的总色散和色散斜率的系统。

公开(公告)号：US5838867A

公开(公告)日：1998-11-17

申请号：US834305

申请日：1997-04-15

申请人： Masashi Onishi ,  Hiroo Kanamori ,  Masayuki Nishimura ,  Tomonori Kashiwada ,  Yasushi Koyano

发明人： Masashi Onishi ,  Hiroo Kanamori ,  Masayuki Nishimura ,  Tomonori Kashiwada ,  Yasushi Koyano

IPC分类号： C03B37/014 ,  G02B6/34 ,  H01S3/067 ,  H01S3/30 ,  G02B6/16

CPC分类号： G02B6/02261 ,  C03B37/014 ,  G02B6/02004 ,  G02B6/0228 ,  G02B6/02285 ,  G02B6/03611 ,  G02B6/03627 ,  G02B6/03644 ,  G02B6/29377 ,  C03B2203/22 ,  C03B2203/36 ,  G02B6/0281 ,  G02B6/0283 ,  G02B6/0286 ,  H01S3/06729 ,  H01S3/302

摘要： The present invention relates to a dispersion compensating fiber for improving a transmission system with it in total chromatic dispersion and dispersion slope in the 1.55 .mu.m wavelength band. The dispersion compensating fiber according to the present invention is characterized by having the following characteristics for light in the 1.55 .mu.m wavelength band: chromatic dispersion not less than -40 ps/km/nm and not more than 0 ps/km/nm; dispersion slope not less than -0.5 ps/km/nm.sup.2 and not more than -0.1 ps/km/nm.sup.2 ; transmission loss not more than 0.5 dB/km; polarization mode dispersion not more than 0.7 ps.multidot.km.sup.-1/2 ; mode field diameter not less than 4.5 .mu.m and not more than 6.5 .mu.m; cut-off wavelength not less than 0.7 .mu.m and not more than 1.7 .mu.m in the length of 2 m; and bending loss at the diameter of 20 mm, not more than 100 dB/m. The dispersion compensating fiber is optically connected with a dispersion shifted fiber as a compensated object at a ratio of appropriate lengths, which can improve the system including the dispersion compensating fiber in the total chromatic dispersion and dispersion slope of the system in the 1.55 .mu.m band.

摘要翻译： 本发明涉及一种用于改善传输系统的色散补偿光纤，其在1.55μm波长带中的总色散和色散斜率。 根据本发明的色散补偿光纤的特征在于对于1.55μm波长带中的光具有以下特性：色散不低于-40ps / km / nm且不大于0ps / km / nm; 色散斜率不小于-0.5 ps / km / nm2，不大于-0.1 ps / km / nm2; 传输损耗不超过0.5 dB / km; 偏振模色散不大于0.7 psxkm- + E，fra 1/2 + EE; 模场直径不小于4.5亩，不超过6.5亩; 截止波长不小于0.7μm，长度不超过1.7μm; 弯曲损耗为20mm，不大于100dB / m。 色散补偿光纤以适当长度的比例与作为补偿对象的色散位移光纤光学连接，这可以改善包括色散补偿光纤在1.55μm带中的系统的总色散和色散斜率的系统 。

公开(公告)号：US5960146A

公开(公告)日：1999-09-28

申请号：US899571

申请日：1997-07-24

申请人： Toshiaki Okuno ,  Masashi Onishi ,  Masayuki Nishimura ,  Satoki Kawanishi ,  Hidehiko Takara ,  Kunihiko Mori

发明人： Toshiaki Okuno ,  Masashi Onishi ,  Masayuki Nishimura ,  Satoki Kawanishi ,  Hidehiko Takara ,  Kunihiko Mori

IPC分类号： G02F1/35 ,  G02F1/365 ,  G02B6/16

CPC分类号： G02B6/02247 ,  G02B6/0228 ,  G02F1/3511 ,  G02F1/365 ,  G02B6/02228

摘要： High peak pulse light is incident on an optical fiber having a dispersion decreasing region which serves as a main region for generating supercontinuum or idler light and in which the chromatic dispersion does not increase but at least partially decreases in the direction in which light travels. The fiber can be applied to broad band width idler light generation with both light transmission directions. Four wave mixing upon incidence of the light on the dispersion decreasing region of the optical fiber are efficiently obtained.

摘要翻译： 高峰脉冲光入射到具有作为用于产生超连续光或空载光的主要区域的色散减小区域的光纤上，并且其中色散不会增加但在光行进方向上至少部分地减小。 光纤可以应用于具有两个光传输方向的宽带宽的惰轮光产生。 有效地获得光入射到光纤的色散减少区域上的四波混合。

公开(公告)号：US06480312B1

公开(公告)日：2002-11-12

申请号：US09212269

申请日：1998-12-16

申请人： Toshiaki Okuno ,  Masashi Onishi ,  Masayuki Nishimura

发明人： Toshiaki Okuno ,  Masashi Onishi ,  Masayuki Nishimura

IPC分类号： H04B1012

CPC分类号： H04B10/2972 ,  H04B10/2525 ,  H04B2210/256

摘要： The present invention provides a dispersion compensating system for bi-directional optical communication using wavelength division multiplexing transmission. Signal lights bi-directionally pass through a signal optical fiber which comprises a dispersion compensating fiber working bi-directionally.

摘要翻译： 本发明提供一种使用波分复用传输的双向光通信的色散补偿系统。 信号灯双向通过信号光纤，其包括双向工作的色散补偿光纤。

公开(公告)号：US5640269A

公开(公告)日：1997-06-17

申请号：US622149

申请日：1996-03-27

申请人： Masayuki Shigematsu ,  Koji Nakazato ,  Tomonori Kashiwada ,  Masayuki Nishimura

发明人： Masayuki Shigematsu ,  Koji Nakazato ,  Tomonori Kashiwada ,  Masayuki Nishimura

IPC分类号： G02B6/00 ,  G02B6/02 ,  H01S3/06 ,  H01S3/067 ,  H01S3/094 ,  H01S3/0941 ,  H01S3/10 ,  H01S3/16 ,  H01S3/17 ,  H04J14/02 ,  H01S3/00

CPC分类号： H04B10/2912 ,  H01S3/06754 ,  H04B10/291 ,  H04B10/2935 ,  H04B10/294 ,  H04J14/0221 ,  H01S2301/04 ,  H01S3/1608 ,  H04B2210/003

摘要： An optical fiber amplifier comprises a composite optical fiber for receiving signal light and excitation light, amplifying the signal light and emitting the amplified signal light, comprising at least two kinds of optical fibers serially coupled each having a glass composition selected from at least two kinds of rare-earth-doped glass compositions, and excitation means for generating excitation light and supplying it to the composite optical fiber. Then, an optical fiber amplifier which reduces the wavelength dependency of gain in various wavelength ranges in wavelength division multiplexing transmission or in optical analog transmission, and which maintains an energy efficiency for amplification, an optical fiber amplifier which makes a wavelength at a gain peak to a predetermined one in accordance with intensities of various input lights, and an optical amplifier repeater comprising this optical fiber amplifier are provided.

摘要翻译： 光纤放大器包括用于接收信号光和激发光的复合光纤，放大信号光并发射放大的信号光，包括至少两种串联耦合的光纤，每个光纤具有选自以下的至少两种 稀土掺杂的玻璃组合物，以及用于产生激发光并将其提供给复合光纤的激励装置。 然后，在波分多路复用传输或光模拟传输中降低各种波长范围的增益的波长依赖性并且保持放大的能量效率的光纤放大器使波长为增益峰值的光纤放大器 提供根据各种输入光的强度的预定值，以及包括该光纤放大器的光放大器中继器。

公开(公告)号：US5430822A

公开(公告)日：1995-07-04

申请号：US127338

申请日：1993-09-28

申请人： Masayuki Shigematsu ,  Tomonori Kashiwada ,  Masayuki Nishimura

发明人： Masayuki Shigematsu ,  Tomonori Kashiwada ,  Masayuki Nishimura

IPC分类号： G02B6/00 ,  G02B6/02 ,  G02B6/34 ,  H04B10/25 ,  H04B10/2507 ,  H04B10/2525 ,  G02B6/26

CPC分类号： G02B6/29377 ,  H04B10/2525 ,  G02B6/29376 ,  H04B2210/252

摘要： An optical communication system that compensate for the dispersion of an optical fiber serving as a transmission path is provided. In its simplest form a dispersion compensating fiber having a sufficient length to compensate for the chromatic dispersion of the optical fiber is divided into portions, each portion having a length selected so as to maintain a linear characteristic of a relative intensity noise of the dispersion compensating fiber, and the divided portions of the dispersion compensating fiber are inserted in the path of the optical fiber while they are optically separated.

摘要翻译： 提供补偿作为传输路径的光纤的色散的光通信系统。 在其最简单的形式中，具有足够长度以补偿光纤的色散的色散补偿光纤被分成部分，每个部分具有选择的长度，以便保持色散补偿光纤的相对强度噪声的线性特性 并且色散补偿光纤的分割部分在光学分离的同时插入光纤的路径中。

公开(公告)号：US5532870A

公开(公告)日：1996-07-02

申请号：US346256

申请日：1994-11-23

申请人： Masayuki Shigematsu ,  Koji Nakazato ,  Tomonori Kashiwada ,  Masayuki Nishimura

发明人： Masayuki Shigematsu ,  Koji Nakazato ,  Tomonori Kashiwada ,  Masayuki Nishimura

IPC分类号： G02B6/00 ,  G02B6/02 ,  H01S3/06 ,  H01S3/067 ,  H01S3/094 ,  H01S3/0941 ,  H01S3/10 ,  H01S3/16 ,  H01S3/17 ,  H04J14/02 ,  H01S3/00 ,  H01S3/30

CPC分类号： H04B10/2912 ,  H01S3/06754 ,  H04B10/291 ,  H04B10/2935 ,  H04B10/294 ,  H04J14/0221 ,  H01S2301/04 ,  H01S3/1608 ,  H04B2210/003

摘要： An optical fiber amplifier comprises a composite optical fiber for receiving signal light and excitation light, amplifying the signal light and emitting the amplified signal light, comprising at least two kinds of optical fibers serially coupled each having a glass composition selected from at least two kinds of rare-earth-doped glass compositions, and excitation means for generating excitation light and supplying it to the composite optical fiber. Then, an optical fiber amplifier which reduces the wavelength dependency of gain in various wavelength ranges in wavelength division multiplexing transmission or in optical analog transmission, and which maintains an energy efficiency for amplification, an optical fiber amplifier which makes a wavelength at a gain peak to a predetermined one in accordance with intensities of various input lights, and an optical amplifier repeater comprising this optical fiber amplifier are provided.

摘要翻译： 光纤放大器包括用于接收信号光和激发光的复合光纤，放大信号光并发射放大的信号光，包括至少两种串联耦合的光纤，每个光纤具有选自以下的至少两种 稀土掺杂的玻璃组合物，以及用于产生激发光并将其提供给复合光纤的激励装置。 然后，在波分多路复用传输或光模拟传输中降低各种波长范围的增益的波长依赖性并且保持放大的能量效率的光纤放大器使波长为增益峰值的光纤放大器 提供根据各种输入光的强度的预定值，以及包括该光纤放大器的光放大器中继器。

公开(公告)号：US5721635A

公开(公告)日：1998-02-24

申请号：US562631

申请日：1995-11-24

申请人： Masayuki Shigematsu ,  Koji Nakazato ,  Tomonori Kashiwada ,  Masayuki Nishimura

发明人： Masayuki Shigematsu ,  Koji Nakazato ,  Tomonori Kashiwada ,  Masayuki Nishimura

IPC分类号： H01S3/067 ,  H01S3/16 ,  H04B10/17 ,  H04J14/02 ,  H01S3/00

CPC分类号： H04B10/2912 ,  H01S3/06754 ,  H04B10/291 ,  H04B10/2935 ,  H04B10/294 ,  H04J14/0221 ,  H01S2301/04 ,  H01S3/1608 ,  H04B2210/003

摘要： This method comprises the steps of: introducing light signals having different wavelengths into an optical amplifier, wherein the optical amplifier has a plurality of fibers with rare earth element doped therein and P is selectively doped in said fibers; and introducing excitation light into the fibers, the excitation light being able to excite the rare earth element. At least one of the fibers has Al therein and the relationship between the Al and P concentration satisfies following expression: C(P)/C(Al)>2, where, C(P) is P concentration in the fiber, and C(Al) is Al concentration in the fiber.

摘要翻译： 该方法包括以下步骤：将具有不同波长的光信号引入到光放大器中，其中光放大器具有掺杂有稀土元素的多个光纤，并且P选择性地掺杂在所述光纤中; 并将激发光引入到纤维中，激发光能够激发稀土元素。 至少其中一根纤维具有Al，Al和P的浓度之间的关系满足下列表达式：C（P）/ C（Al）> 2，其中C（P）是纤维中的P浓度，C（ Al）是纤维中的Al浓度。

公开(公告)号：US5680491A

公开(公告)日：1997-10-21

申请号：US657560

申请日：1996-06-04

申请人： Masayuki Shigematsu ,  Tomonori Kashiwada ,  Masayuki Nishimura

发明人： Masayuki Shigematsu ,  Tomonori Kashiwada ,  Masayuki Nishimura

IPC分类号： G02B6/00 ,  G02B6/02 ,  G02B6/34 ,  H04B10/25 ,  H04B10/2507 ,  H04B10/2525 ,  G02B6/28

CPC分类号： G02B6/29377 ,  H04B10/2525 ,  G02B6/29376 ,  H04B2210/252

摘要： An optical communication system that compensate for the dispersion of an optical fiber serving as a transmission path is provided. In its simplest form, a dispersion compensating fiber having a sufficient length to compensate for the chromatic dispersion of the optical fiber is divided into portions, each portion having a length selected so as to maintain a linear characteristic of a relative intensity noise of the dispersion compensating fiber, and the divided portions of the dispersion compensating fiber are inserted in the path of the optical fiber while they are optically separated.

摘要翻译： 提供补偿作为传输路径的光纤的色散的光通信系统。 在其最简单的形式中，具有足够长度以补偿光纤的色散的色散补偿光纤被分成多个部分，每个部分具有选择的长度，以保持色散补偿的相对强度噪声的线性特性 光纤，并且色散补偿光纤的分割部分在光学分离的同时插入光纤的路径中。