公开(公告)号：US20040175180A1

公开(公告)日：2004-09-09

申请号：US10807287

申请日：2004-03-24

申请人： Fujitsu Limited

发明人： Yasushi Sugaya

IPC分类号： H04J014/02

CPC分类号： H04B10/291 ,  H04B10/077 ,  H04B10/07955 ,  H04J14/0221

摘要： Disclosed is an apparatus for controlling wavelength-division-multiplexed light wherein overall power of wavelength-division-multiplexed light is rendered constant through control for uniformalizing the level of only one wave of maximum power, and wherein the levels of respective channels are made substantially uniform. Optical level control means controls the optical level of propagating wavelength-division-multiplexed light, and a portion of the wavelength-division-multiplexed light output from the output level control means is branched to a tunable optical filter, which selectively outputs the light of each wavelength contained in the wavelength-division-multiplexed light. The light of each wavelength output from the optical filter is photoelectrically converted to an electric signal by photoelectric conversion means. Peak detection means detects the maximum peak value of the electric signal output from the photoelectric conversion means, and a feedback signal is input to the optical level control means in such a manner that the maximum peak value becomes a set value.

摘要翻译： 公开了一种用于控制波分复用光的装置，其中波分复用光的总功率通过控制使得仅一波最大功率的电平均匀化而变得恒定，并且其中各通道的电平基本上均匀 。 光电平控制装置控制传播的波分复用光的光学电平，并且从输出电平控制装置输出的波分复用光的一部分被分支到可调光滤波器，其可选择性地输出每个 包含在波分复用光中的波长。 从滤光器输出的每个波长的光被光电转换装置光电转换成电信号。 峰值检测装置检测从光电转换装置输出的电信号的最大峰值，并且反馈信号以最大峰值变为设定值的方式输入到光电平控制装置。

公开(公告)号：US20030002140A1

公开(公告)日：2003-01-02

申请号：US10235720

申请日：2002-09-06

申请人： FUJITSU LIMITED

发明人： Yasushi Sugaya ,  Miki Takeda ,  Susumu Kinoshita ,  Terumi Chikama

IPC分类号： H01S003/00

CPC分类号： H04B10/296 ,  H01S3/06758 ,  H01S3/10015 ,  H01S3/1301 ,  H01S3/1305 ,  H01S2301/04 ,  H04B10/2931

摘要： A multi-wavelength light amplifier includes a first-stage light amplifier which has a first-light amplifying optical fiber amplifying a light input, a second-stage light amplifier which has a second light amplifying optical fiber amplifying a first light output from the first-stage light amplifier, and an optical system which maintains a second light output of the second-stage light amplifier at a constant power level. The first-stage and second-stage light amplifiers have different gain vs wavelength characteristics so that the multi-wavelength light amplifier has no wavelength-dependence of a gain thereof.

公开(公告)号：US20020141045A1

公开(公告)日：2002-10-03

申请号：US09903579

申请日：2001-07-13

申请人： Fujitsu Limited

发明人： Shinya Inagaki ,  Norifumi Shukunami ,  Manabu Watanabe ,  Hisashi Takamatsu ,  Keiko Sasaki ,  Tomoaki Takeyama ,  Yasushi Sugaya ,  Kaoru Moriya ,  Takashi Satou

IPC分类号： H01S003/00

CPC分类号： H01S3/06754 ,  H01S2301/02

摘要： A signal light passes through an isolator, and is coupled by a coupler with a pump light from a pump light source. Then, the signal light passes through an ASE reflection filter, is amplified by an EDF, and is transmitted from an isolator. At this time, an ASE light having a predetermined wavelength among ASE lights that occur within the EDF and proceed to the ASE reflection filter is reflected and again input to the EDF. By setting the predetermined wavelength to a wavelength on the short wavelength side of an amplification band of the EDF, gain deviation occurring on the long wavelength side of the amplification band can be cancelled.

摘要翻译： 信号光通过隔离器，并通过耦合器与来自泵浦光源的泵浦光耦合。 然后，信号光通过ASE反射滤光器，被EDF放大，并从隔离器传输。 此时，在EDF内出现并进入ASE反射滤波器的ASE光中具有预定波长的ASE光被反射并再次输入到EDF。 通过将预定波长设定为EDF的放大频带的短波长侧的波长，可以消除在放大频带的长波长侧发生的增益偏差。

公开(公告)号：US20040246568A1

公开(公告)日：2004-12-09

申请号：US10761296

申请日：2004-01-22

申请人： Fujitsu Limited

发明人： Miki Onaka ,  Etsuko Hayashi ,  Yasushi Sugaya

IPC分类号： H01S003/00

CPC分类号： H04B10/291 ,  H04B10/2569

摘要： An object of the present invention is to provide at low cost, a highly functional and small size optical amplifier, which realizes a polarization mode dispersion (PMD) compensation function and an optical amplifying function, with a simple construction. To this end, the optical amplifier of the present invention comprises: a polarization control section that controls the polarization state of input signal light; a PMD generation section that receives the signal light from the polarization control section at a polarization-preserving fiber thereof doped with a rare earth element, and gives a differential group delay between orthogonal polarization mode components of the signal light to perform PMD compensation and at the same time amplifies the signal light; a pumping light supply section that supplies pumping light to the polarization-preserving fiber; a monitoring section that monitors the PMD generation state of the signal light from the PMD generation section, and the like; and a control section that controls the polarization control section and the pumping light supply section based on the monitor results of the monitoring section.

摘要翻译： 本发明的目的是提供一种低功耗和小尺寸的光放大器，其实现了具有简单结构的偏振模色散（PMD）补偿功能和光放大功能。 为此，本发明的光放大器包括：偏振控制部，其控制输入信号光的偏振状态; PMD生成部，其在掺杂有稀土元素的偏振光保留光纤处接收来自偏振光控制部的信号光，并且在信号光的正交偏振模式分量之间给出差分组延迟以执行PMD补偿，并且在 同时放大信号灯; 泵浦光供给部，其向所述偏振光保持光纤供给泵浦光; 监视来自PMD生成部的信号光的PMD生成状态的监视部等， 以及控制部，其基于监视部的监视结果来控制偏振控制部和泵送光供给部。

公开(公告)号：US20030123142A1

公开(公告)日：2003-07-03

申请号：US10322584

申请日：2002-12-19

申请人： FUJITSU LIMITED

发明人： Susumu Kinoshita ,  Yasushi Sugaya

IPC分类号： H01S003/00

CPC分类号： H04B10/2941 ,  H01S3/06704 ,  H01S3/06725 ,  H01S3/06758 ,  H01S3/094011 ,  H01S3/1301 ,  H01S3/2391 ,  H04B10/25133 ,  H04B10/296 ,  H04B10/2972 ,  H04B2210/256 ,  H04B2210/258

摘要： An optical amplifier, or optical repeater, for amplifying wavelength division multiplexed (WDM) light. A first demultiplexer demultiplexes the WDM light into first and second lights corresponding to different wavelengths in the WDM light. First and second optical amplifiers amplify the first and second lights, respectively. A first multiplexer multiplexes the amplified first and second lights into a multiplexed light. A dispersion compensator compensates for dispersion in the multiplexed light. A second demultiplexer demultiplexes the disperson compensated, multiplexed light into the first and second lights. Third and fourth optical amplifiers amplify the demultiplexed first and second lights, respectively. A second multiplexer multiplexes the amplified first and second lights from the third and fourth optical amplifiers into a WDM light. The optical amplifier can be configured so that the first and second lights travel through the dispersion compensator in opposite directions.

摘要翻译： 用于放大波分复用（WDM）光的光放大器或光中继器。 第一解复用器将WDM光分解成对应于WDM光中的不同波长的第一和第二光。 第一和第二光放大器分别放大第一和第二灯。 第一多路复用器将放大的第一和第二光复用到复用光中。 色散补偿器补偿复用光中的色散。 第二解复用器将分散补偿的多路复用光解复用为第一和第二光。 第三和第四光放大器分别放大解复用的第一和第二光。 第二复用器将来自第三和第四光放大器的放大的第一和第二光复用到WDM光中。 光放大器可以被配置成使得第一和第二光沿相反方向行进通过色散补偿器。

公开(公告)号：US20020191275A1

公开(公告)日：2002-12-19

申请号：US10219246

申请日：2002-08-16

申请人： FUJITSU LIMITED

发明人： Susumu Kinoshita ,  Yasushi Sugaya

IPC分类号： H01S003/00 ,  H04B010/12

CPC分类号： H04B10/2941 ,  H01S3/06704 ,  H01S3/06725 ,  H01S3/06758 ,  H01S3/094011 ,  H01S3/1301 ,  H01S3/2391 ,  H04B10/25133 ,  H04B10/296 ,  H04B10/2972 ,  H04B2210/256 ,  H04B2210/258

摘要： An optical amplifier, or optical repeater, for amplifying wavelength division multiplexed (WDM) light. A first demultiplexer demultiplexes the WDM light into first and second lights corresponding to different wavelengths in the WDM light. First and second optical amplifiers amplify the first and second lights, respectively. A first multiplexer multiplexes the amplified first and second lights into a multiplexed light. A dispersion compensator compensates for dispersion in the multiplexed light. A second demultiplexer demultiplexes the dispersion compensated, multiplexed light into the first and second lights. Third and fourth optical amplifiers amplify the demultiplexed first and second lights, respectively. A second multiplexer multiplexes the amplified first and second lights from the third and fourth optical amplifiers into a WDM light. The optical amplifier can be configured so that the first and second lights travel through the dispersion compensator in opposite directions.

摘要翻译： 用于放大波分复用（WDM）光的光放大器或光中继器。 第一解复用器将WDM光分解成对应于WDM光中的不同波长的第一和第二光。 第一和第二光放大器分别放大第一和第二灯。 第一多路复用器将放大的第一和第二光复用到复用光中。 色散补偿器补偿复用光中的色散。 第二解复用器将色散补偿的多路复用光解复用为第一和第二光。 第三和第四光放大器分别放大解复用的第一和第二光。 第二复用器将来自第三和第四光放大器的放大的第一和第二光复用到WDM光中。 光放大器可以被配置成使得第一和第二光沿相反方向行进通过色散补偿器。

公开(公告)号：US20020044336A1

公开(公告)日：2002-04-18

申请号：US09858509

申请日：2001-05-17

申请人： Fujitsu Limited

发明人： Tomoto Tanaka ,  Miki Onaka ,  Etsuko Hayashi ,  Yasushi Sugaya

IPC分类号： H01S003/00

CPC分类号： H01S3/2375 ,  H01S3/06758 ,  H01S3/10015 ,  H01S3/1301 ,  H01S3/1608 ,  H01S3/302 ,  H01S2301/02 ,  H01S2301/04 ,  H04B10/0731 ,  H04B10/0795 ,  H04B10/0797 ,  H04B10/2916

摘要： An object of the invention is to provide an optical amplification apparatus using Raman amplification, which can reliably judge an input interruption of signal light and can shut down the supply of excitation light in accordance with a judged input interruption of the signal light. To this end, the optical amplification apparatus of the present invention comprises an input interruption detection means for detecting a noise light component due to the Raman amplification, and judging an input interruption of the signal light based on the detection result, and further comprises a shut down control means for shutting down supply of the excitation light when an input interruption of the signal light is judged by the input interruption detection means. The input interruption detection means computes the noise light power due to the Raman amplification in accordance with monitored excitation light power, and corrects a threshold value as a judgment reference for an input interruption using the calculation result, and judges an input interruption of the signal light when a monitored value of the input light power to a second optical amplifying means is less than the post-correction threshold value.

公开(公告)号：US20040196158A1

公开(公告)日：2004-10-07

申请号：US10798267

申请日：2004-03-12

申请人： Fujitsu Limited

发明人： Yasushi Sugaya ,  Etsuko Hayashi ,  Masato Nishihara ,  Shinichirou Muro

IPC分类号： B60Q001/00

CPC分类号： G02B6/264 ,  H01S3/005 ,  H01S3/0078 ,  H01S3/06758 ,  H01S3/094003 ,  H01S3/094096 ,  H01S3/0941 ,  H01S3/1301 ,  H01S3/1305 ,  H01S3/1608 ,  H01S3/302 ,  H04B10/2916

摘要： In an optical transmission system according to one aspect of the present invention, for transmitting a WDM light from a transmission station to a reception station, utilizing a Raman amplifier, the Raman amplifier comprises an optical amplification medium; a pumping light source generating a plurality of pumping lights having wavelengths different from each other; an optical device introducing the plurality of pumping lights to the optical amplification medium; and control means for controlling the pumping light source, the transmission station sends out a plurality of reference lights having wavelengths at which respective Raman gain obtained by the plurality of pumping lights reach peaks or wavelengths close to the above wavelengths, and the control means controls the plurality of pumping lights based on the optical powers of the plurality of reference lights. Thus, it becomes possible to accurately manage the optical power balance of the WDM light and the optical power of the entire WDM light.

摘要翻译： 在根据本发明的一个方面的光传输系统中，为了利用拉曼放大器将来自发射站的WDM光发射到接收站，所述拉曼放大器包括光放大介质; 产生具有彼此不同波长的多个泵浦光的泵浦光源; 将所述多个泵浦光引入到所述光放大介质的光学装置; 以及用于控制所述泵浦光源的控制装置，所述发送站发出多个具有波长的参考光，所述波长使由所述多个泵浦光获得的各拉曼增益达到接近上述波长的波峰或波长，并且所述控制装置控制 基于多个参考光的光功率的多个泵浦光。 因此，可以精确地管理WDM光的光功率平衡和整个WDM光的光功率。

公开(公告)号：US20040080812A1

公开(公告)日：2004-04-29

申请号：US10622580

申请日：2003-07-21

申请人： FUJITSU LIMITED

发明人： Yasushi Sugaya ,  Shinichirou Muro ,  Etsuko Hayashi

IPC分类号： H01S003/00

CPC分类号： H04B10/296 ,  H04B10/0775 ,  H04B10/2916

摘要： Multi-wavelength light, including a plurality of segments of light signal with a different wavelength each, is inputted into a Raman amplification fiber. Pumping light generated by a pumping light source is supplied to the Raman amplification fiber in the opposite direction of the transmission direction of the multi-wavelength light. An auxiliary light source generates auxiliary light. An auxiliary light control circuit adjusts the optical power of the auxiliary light with a prescribed response time, based on the change in input power of the multi-wavelength light. The auxiliary light is supplied to the Raman amplification fiber in the same direction as the transmission direction of the multi-wavelength light.

摘要翻译： 包括多个具有不同波长的光信号段的多波长光被输入到拉曼放大光纤中。 由泵浦光源产生的泵浦光以与多波长光的透射方向相反的方向被提供给拉曼放大光纤。 辅助光源产生辅助光。 辅助光控制电路基于多波长光的输入功率的变化，以规定的响应时间来调整辅助光的光功率。 辅助光以与多波长光的透射方向相同的方向供给到拉曼放大光纤。

公开(公告)号：US20030193713A1

公开(公告)日：2003-10-16

申请号：US10422700

申请日：2003-04-25

申请人： FUJITSU LIMITED

发明人： Yasushi Sugaya ,  Tomoto Tanaka ,  Etsuko Hayashi

IPC分类号： H01S003/00

CPC分类号： H04B10/2916 ,  H01S3/06758 ,  H01S3/094096 ,  H01S3/10015 ,  H01S3/1301 ,  H01S3/1608 ,  H01S3/2375 ,  H01S3/30 ,  H01S3/302 ,  H01S2301/02 ,  H01S2301/04 ,  H01S2302/02 ,  H04B2210/258

摘要： The present invention aims at providing an optical amplification apparatus for improving noise characteristics by controlling an amplification operation by assuming a noise figure of the overall apparatus and by taking influences of noise light due to Raman amplification into consideration, and a controlling method of the optical amplification apparatus. The optical amplification apparatus according to the present invention comprises first optical amplifying means for Raman amplifying signal light by supplying excitation light to a Raman amplification medium, second amplifying means for amplifying signal light output from the first optical amplifying means, target value setting means for setting a target value that minimizes the noise figure of the overall apparatus as to input light power of the second optical amplifying means, and excitation light controlling means for controlling an excitation light supply condition of the first optical amplifying means in accordance with the target value set by the target value setting means. Consequently, the noise characteristics of the overall apparatus can be optimized by the control inside the own apparatus and excellent noise characteristics can be accomplished.