公开(公告)号：US06512613B1

公开(公告)日：2003-01-28

申请号：US09380503

申请日：1999-09-03

申请人： Shigeru Tanaka ,  Masayuki Nishimura ,  Masayuki Shigematsu ,  Yasunori Murakami

发明人： Shigeru Tanaka ,  Masayuki Nishimura ,  Masayuki Shigematsu ,  Yasunori Murakami

IPC分类号： H04J1402

CPC分类号： H04J14/0206 ,  H04B10/294 ,  H04J14/0213

摘要： The present invention relates to a WDM transmission system and the like suitable for optical communications between local stations having a relatively short repeater interval. In particular, the WDM transmission repeater employed in the WDM transmission system demultiplexes a plurality of signal lights propagating through a transmission line into first and second groups, takes out the second group, comprises a multiplexer for sending into the transmission line a new WDM signal group in which the first group thus demultiplexed and a third group of signal lights different from those of the first group are multiplexed, and has a special structure for reducing the influence of the not-demultiplexed crosstalk components within the second group upon the optical communications.

摘要翻译： 本发明涉及适合于具有相对短的中继器间隔的本地站之间的光通信的WDM传输系统等。 特别地，在WDM传输系统中采用的WDM传输中继器将通过传输线传播的多个信号光分离成第一和第二组，取出第二组，包括一个多路复用器，用于向传输线发送新的WDM信号组 其中如此解复用的第一组和与第一组不同的第三组信号光被复用，并且具有用于在光通信时减少第二组内的未解复用的串扰分量对第一组的影响的特殊结构。

公开(公告)号：US06952309B1

公开(公告)日：2005-10-04

申请号：US09667576

申请日：2000-09-22

申请人： Tetsufumi Tsuzaki ,  Masayuki Nishimura ,  Masayuki Shigematsu ,  Hitoshi Hatayama ,  Eisuke Sasaoka

发明人： Tetsufumi Tsuzaki ,  Masayuki Nishimura ,  Masayuki Shigematsu ,  Hitoshi Hatayama ,  Eisuke Sasaoka

IPC分类号： G02F1/01 ,  G02F1/313 ,  H01S3/00 ,  H01S3/067 ,  H01S3/10 ,  H01S3/13

CPC分类号： H01S3/06758 ,  H01S3/06754 ,  H01S3/10007 ,  H01S3/10023 ,  H01S3/1301 ,  H01S2301/04 ,  H04B10/2941 ,  H04B10/2942 ,  H04B10/296

摘要： A optical filter has a loss spectrum whose gradient dL/dλ of a loss L (dB) with respect to the wavelength λ (nm) is variable in the wavelength band of multiplexed signal light. A control circuit detects each power of signal light components demultiplexed by an optical coupler and controls the power of optical pumping light to be supplied to an optical amplification section from an optical pumping light sources such that the power of output signal light has a predetermined target value. The control circuit also controls the gradient dL/dλ of the optical filter on the basis of powers of the signal light components.

摘要翻译： 滤光器具有损耗谱，其相对于波长λ（nm）的损耗L（dB）的梯度dL /dlλ在复用信号光的波长带中是可变的。 控制电路检测由光耦合器解复用的信号光分量的每个功率，并且控制从光泵浦光源提供给光放大部分的光泵浦光的功率，使得输出信号光的功率具有预定的目标值 。 控制电路还基于信号光分量的功率来控制滤光器的梯度dL / dl。

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：US07330302B2

公开(公告)日：2008-02-12

申请号：US10607380

申请日：2003-06-27

申请人： Toshiyuki Miyamoto ,  Masayuki Shigematsu ,  Masayuki Nishimura

发明人： Toshiyuki Miyamoto ,  Masayuki Shigematsu ,  Masayuki Nishimura

IPC分类号： H01S3/00

CPC分类号： H04B10/2525 ,  H04B10/2916 ,  H04B2210/003

摘要： This invention provides an optical transmission system which allows to perform high-quality transmission of each of a plurality of signal channels multiplexed. In the optical transmission system, signal light in which a plurality of signal channels with an optical frequency spacing of 400 GHz or more but 12.5 THz or less is transmitted from an optical transmitter to a Raman amplifier through an optical fiber transmission line. In the Raman amplifier, pumping light from a pumping light source unit is supplied to an optical fiber through an optical coupler. The multiplexed signal light inputted to the Raman amplifier arrives at the optical fiber through an optical isolator and optical coupler, and Raman-amplified by the optical fiber. The Raman-amplified multiplexed signal light is outputted from the Raman amplifier through an optical coupler and optical isolator.

摘要翻译： 本发明提供一种光传输系统，其允许多路复用的多个信号信道中的每一个的高质量传输。 在光传输系统中，其中通过光纤传输线路将光频率为400GHz以上且12.5THz以下的多个信号信道从光发射机发射到拉曼放大器的信号光。 在拉曼放大器中，来自泵浦光源单元的泵浦光通过光耦合器提供给光纤。 输入到拉曼放大器的复用信号光通过光隔离器和光耦合器到达光纤，并由光纤拉曼放大。 拉曼放大的复用信号光通过光耦合器和光隔离器从拉曼放大器输出。

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。

公开(公告)号：US5509098A

公开(公告)日：1996-04-16

申请号：US153055

申请日：1993-11-17

申请人： Masayuki Shigematsu ,  Masayuki Nishimura

发明人： Masayuki Shigematsu ,  Masayuki Nishimura

IPC分类号： H01S3/10 ,  H01S3/06 ,  H01S3/067 ,  H04B10/07 ,  H04B10/25 ,  H04B10/2557 ,  H04B10/2569 ,  H04B10/272 ,  H04B10/54 ,  H04B10/58 ,  G02B6/16 ,  H04B3/52

CPC分类号： H04B10/2569

摘要： In this invention, an optical analog signal obtained such that light having a wavelength .lambda.1 is intensity-modulated or frequency-modulated with a modulation index m per channel and a chirping amount .lambda.s for 100% modulation is transmitted. An optical element connected to an outlet of a transmission medium having a polarization mode dispersion .tau. with respect to an optical signal is selected such that when the optical signal output from the optical element requires a predetermined composite second-order distortion C, a transmittance T.sub.0 of the optical element for the light having the wavelength .lambda.1 and a polarization dependency A of an insertion loss satisfy the following condition:20 log.sub.10 {(2.pi.c/.lambda.1.sup.2).multidot.n.multidot.(A/T.sub.0).multidot..tau..multidot.m.multidot..lambda.s}.ltoreq.C(where n is a number of beats occurring in the optical signal and c is the light velocity).

摘要翻译： 在本发明中，发送光学模拟信号，使得具有波长λ1的光被强制调制或频率调制，每通道调制指数m和100％调制的啁啾量λs。 选择连接到具有相对于光信号的偏振模色散T r的传输介质的出口的光学元件，使得当从光学元件输出的光信号需要预定的复合二阶失真C时，透射率T0 具有波长λ1的光和插入损耗的偏振依赖性A的光学元件满足以下条件：20log10 {（2πc/λ12）×nx（A / T0）×τxmxλs} = C（其中n是在光信号中发生的节拍数，c是光速）。

公开(公告)号：US5694239A

公开(公告)日：1997-12-02

申请号：US498985

申请日：1995-07-06

申请人： Masayuki Shigematsu ,  Masayuki Nishimura

发明人： Masayuki Shigematsu ,  Masayuki Nishimura

IPC分类号： G02B6/00 ,  G02B6/122 ,  G02F1/35 ,  H01S3/067 ,  G02F1/39

CPC分类号： H04B10/2531 ,  G02F1/3538 ,  H01S3/06754

摘要： An optical phase conjugator includes an optical nonlinear medium for receiving original signal light and pumping light, and generating and outputting phase-conjugate light by a nonlinear optical effect. The optical nonlinear medium contains an element which can be activated upon irradiation of activation light and has an amplification function with respect to at least the pumping light. The optical phase conjugator comprises a first optical coupler for coupling the original signal light and the pumping light and then inputting the coupled light into the medium, and a second optical coupler for inputting the activation light into the medium. An improvement in phase-conjugate light generating efficiency is attained, and phase-conjugate light having a sufficiently high intensity can be obtained by the optical phase conjugator with a simple, compact arrangement.

摘要翻译： 光相位共轭器包括用于接收原始信号光和泵浦光的光学非线性介质，并且通过非线性光学效应产生和输出相位共轭光。 光学非线性介质包含可以在激活光照射时被激活的元件，并且至少相对于泵浦光具有放大功能。 光相位共轭器包括用于耦合原始信号光和泵浦光，然后将耦合光输入介质的第一光耦合器，以及用于将激活光输入介质的第二光耦合器。 实现了相位共轭光产生效率的提高，并且通过光学相位共轭器以简单且紧凑的布置可以获得具有足够高强度的相位共轭光。

公开(公告)号：US5381261A

公开(公告)日：1995-01-10

申请号：US937896

申请日：1992-11-05

申请人： Shigeru Hirai ,  Youichi Ishiguro ,  Yasuji Hattori ,  Masayuki Nishimura ,  Masayuki Shigematsu ,  Minoru Watanabe ,  Kouji Nakazato

发明人： Shigeru Hirai ,  Youichi Ishiguro ,  Yasuji Hattori ,  Masayuki Nishimura ,  Masayuki Shigematsu ,  Minoru Watanabe ,  Kouji Nakazato

IPC分类号： G02F1/09 ,  G02B5/30

CPC分类号： G02F1/093 ,  G02F2203/06 ,  Y10S372/703

摘要： An optical isolator not dependent on the plane of polarization of an incident beam and does not allow the plane of polarization to change on the outgoing side. The optical isolator comprises a first parallel flat double refractive crystal substance; a first Faraday rotor for rotating the plane of polarization of a beam; a second parallel flat double refractive crystal substance; a second Faraday rotor for rotating the plane of polarization in a direction opposite to that in which said first Faraday rotor rotates the plane of polarization; a third parallel flat double refractive substance; a fourth parallel flat double refractive substance; and permanent magnets for magnetizing the Faraday rotor and second Faraday rotors. Since a pair of Faraday rotors for rotating the plane of polarization in opposite directions, the plane of polarization on the incident side does not change on the outgoing side.

摘要翻译： PCT No.PCT / JP92 / 00171 Sec。 371日期：1992年11月5日 102（e）日期1992年11月5日PCT提交1992年2月19日PCT公布。 出版物WO92 / 15040 日期：1992年9月3日。光隔离器不依赖于入射光束的偏振平面，不允许偏振平面在出射侧发生变化。 光隔离器包括第一平行扁平双折射晶体物质; 用于旋转梁的偏振平面的第一法拉第转子; 第二平行平面双折射晶体物质; 第二法拉第转子，用于在与所述第一法拉第转子旋转偏振平面的方向相反的方向上旋转偏振平面; 第三平行平面双折射物质; 第四平行平面双折射物质; 以及用于磁化法拉第转子和第二法拉第转子的永磁体。 由于用于在相反方向旋转偏振平面的一对法拉第转子，入射侧的偏振面在出射侧不变。

公开(公告)号：US06259554B1

公开(公告)日：2001-07-10

申请号：US09402063

申请日：1999-09-28

申请人： Masayuki Shigematsu ,  Masayuki Nishimura

发明人： Masayuki Shigematsu ,  Masayuki Nishimura

IPC分类号： H01S300

CPC分类号： H04B10/2972 ,  H04B10/03 ,  H04B10/0775 ,  H04B10/0777 ,  H04B10/2918 ,  H04B2210/078 ,  H04B2210/08

摘要： A repeater station 10 detects whether or not an abnormality exists in each of signal light and monitor light having arrived from a terminal station 1 or a repeater station 20, and controls, according to the result of detection, operations of optical amplifiers 11 and 12 and the monitor light. In the case where both of the signal light and monitor light arriving from the terminal station 1 via the optical transmission line for the downstream direction are abnormal, the optical amplifier 11 for the downstream direction stops its amplifying operation by itself, whereas a monitor control apparatus 13 stops the amplifying operation of the other optical amplifier for the upstream direction and also stops transmitting the monitor light to the terminal station 1 in the upstream direction.

摘要翻译： 中继站10检测在从终端站1或中继站20到达的信号光和监视光中的每一个中是否存在异常，并且根据检测结果控制光放大器11和12的操作和 显示器灯。 在从终端站1经由用于下游方向的光传输线路到达的信号光和监视光都是异常的情况下，用于下游方向的光放大器11自身停止其放大操作，而监视器控制装置 13停止上游侧的另一光放大器的放大动作，并且在上游方向上停止向终端站1发送监视光。