公开(公告)号：US06185022B2

公开(公告)日：2001-02-06

申请号：US09027725

申请日：1998-02-23

申请人： Shin-ichirou Harasawa

发明人： Shin-ichirou Harasawa

IPC分类号： H04J1402

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

摘要： To improve the OSNR on a receiving side it is necessary to control pre-emphasis, and further to automatically control the pre-emphasis. Furthermore, when carrying out wavelength-division multiplexing, it is also necessary to control wavelength. The optical spectrum of signal lights is detected in both a transmitting terminal station and a receiving terminal station, a transmitting side spectrum detection result and a receiving side spectrum detection result are compared, and the levels and wavelengths of signal lights to be transmitted are controlled.

摘要翻译： 为了改善接收端的OSNR，需要控制预加重，并进一步自动控制预加重。 此外，当进行波分复用时，还需要控制波长。 在发送终端站和接收终端站中检测信号光的光谱，比较发射侧频谱检测结果和接收侧频谱检测结果，并控制要发送的信号光的电平和波长。

公开(公告)号：US06907157B2

公开(公告)日：2005-06-14

申请号：US10273098

申请日：2002-10-18

申请人： Shin-ichirou Harasawa

发明人： Shin-ichirou Harasawa

IPC分类号： G02F1/35 ,  H01S3/094 ,  H01S3/0941 ,  H01S3/10 ,  H01S3/30 ,  H04B10/07 ,  H04B10/29 ,  H04B10/296 ,  H04B10/14 ,  G02B6/28

CPC分类号： H04B10/2916

摘要： In the method according to the present invention, an optical fiber transmission line for transmitting signal light is first provided. A Raman repeater 16 having a pumping source for supplying pump light propagating in a direction opposite to the direction of propagation of the signal light to the optical fiber transmission line is provided in the middle of the optical fiber transmission line. A terminal device having a similar pumping source is provided at one end of the optical fiber transmission line. A control signal is transmitted to the Raman repeater 16 by the pump light from the terminal device. The Raman repeater is controlled by the control signal transmitted. According to this method, the Raman repeater is controlled by the pump light from the terminal device provided at the receiving end, thereby eliminating a problem arising in the case of control by signal light as in the prior art.

摘要翻译： 在根据本发明的方法中，首先提供用于传输信号光的光纤传输线。 在光纤传输线的中间设置有具有用于将沿与信号光的传播方向相反的方向传播的泵浦光提供给光纤传输线的泵浦源的拉曼中继器16。 具有类似泵浦源的端子装置设置在光纤传输线的一端。 通过来自终端装置的泵浦光将控制信号发送到拉曼中继器16。 拉曼转发器由发送的控制信号控制。 根据该方法，拉曼中继器由设置在接收端的终端装置的泵浦光控制，从而消除了如现有技术中由信号光控制的情况。

公开(公告)号：US06452721B2

公开(公告)日：2002-09-17

申请号：US09769522

申请日：2001-01-26

申请人： Hiroyuki Deguchi ,  Shin-ichirou Harasawa

发明人： Hiroyuki Deguchi ,  Shin-ichirou Harasawa

IPC分类号： H04B1012

CPC分类号： H01S3/302 ,  H01S3/0014

摘要： An optical amplifier including a pumping source for supplying pump light to an optical fiber transmission line is provided so that at least a part of the optical fiber transmission line produces Raman amplification to an optical signal. An optical filter unit for selectively switching between a first condition where the optical signal and the pump light are passed and a second condition where the optical signal is passed and the pump light is not passed is connected between the optical fiber transmission line and the optical amplifier. The power of the optical signal in the first condition is compared with that in the second condition, and the characteristics of the optical fiber transmission line, such as a splice loss therein, is evaluated according to the result of this comparison. In the second condition, the residual pump light is not supplied to the optical fiber transmission line, so that a measurement error due to Raman amplification can be eliminated to thereby allow accurate evaluation of the characteristics of the optical fiber transmission line.

摘要翻译： 提供了包括用于向光纤传输线提供泵浦光的泵浦源的光放大器，使得光纤传输线的至少一部分向光信号产生拉曼放大。 在光纤传输线和光放大器之间连接有用于选择性地切换光信号与泵浦光通过的第一状态和光信号通过的第二状态和泵浦光不通过的滤光单元 。 将第一条件下的光信号的功率与第二条件中的光信号的功率进行比较，根据该比较的结果来评价光纤传输线的特性，例如其中的接合损耗。 在第二条件下，不向光纤传输线提供残余泵浦光，从而可以消除由于拉曼放大引起的测量误差，从而可以准确地评估光纤传输线的特性。

公开(公告)号：US07031618B2

公开(公告)日：2006-04-18

申请号：US10056080

申请日：2002-01-28

申请人： Shin-ichirou Harasawa

发明人： Shin-ichirou Harasawa

IPC分类号： H04B10/08 ,  H04B10/00 ,  H04B10/02 ,  H04J14/02

CPC分类号： H04B10/2942 ,  H04B10/0777 ,  H04B10/2916 ,  H04B2210/075

摘要： In an optical transmission system, an optical terminal transmits a plurality of tone signals corresponding to a plurality of gain bands, where the frequencies of the plurality of tone signals are different from each other, and each of the plurality of tone signals has a characteristic which is varied according to detected power of optical signals in the corresponding gain band. Each optical repeater receives the plurality of tone signals, extracts the characteristics of the plurality of tone signals, and compares a signal representing each characteristic with a reference signal. The optical repeater controls the gains of optical amplification in the plurality of gain bands based on the comparison result so as to equalize the gains in the plurality of gain bands.

公开(公告)号：US06816683B2

公开(公告)日：2004-11-09

申请号：US10214581

申请日：2002-08-09

申请人： Takafumi Terahara ,  Takeo Osaka ,  Shin-ichirou Harasawa

发明人： Takafumi Terahara ,  Takeo Osaka ,  Shin-ichirou Harasawa

IPC分类号： H04B1016

CPC分类号： H04B10/2918 ,  H04B10/035 ,  H04B10/071 ,  H04B10/0775 ,  H04B10/0777 ,  H04B2210/074 ,  H04B2210/078 ,  H04J14/0201 ,  H04J14/0209 ,  H04J14/0217 ,  H04J14/0227 ,  H04J14/0241 ,  H04J14/0245 ,  H04J14/0249 ,  H04J14/0279 ,  H04J14/028 ,  H04J14/0283 ,  H04Q11/0001

摘要： A supervisory system in a wavelength division multiplexing communications network is provided with a first and a second terminal stations and a repeater unit. The first terminal station transmits a supervisory signal to the second terminal station. The second terminal station transfers the supervisory signal to the repeater unit to be monitored. Paths to a hub station A and a hub station B can be a single path by looping back a supervisory signal output from the hub stations A and B for issuing and terminating the supervisory signal at a first and a second branch stations connected through an optical wavelength multiplexing/demultiplexing unit. If the hub station B loops back a supervisory signal, the supervisory signal output from the hub station A can be returned to the hub station A again after circulating the path. If the path of the supervisory signal is set to allow the signal to pass through all repeater units, only one channel is required for a supervisory signal without lowering the modulation rate during a branching operation, and the repeater unit can receive a supervisory signal without fail.

公开(公告)号：US06404523B1

公开(公告)日：2002-06-11

申请号：US09236631

申请日：1999-01-26

申请人： Hajime Morikawa ,  Shin-ichirou Harasawa

发明人： Hajime Morikawa ,  Shin-ichirou Harasawa

IPC分类号： H04J1402

CPC分类号： H04B10/0799 ,  H04B10/0775 ,  H04B10/07953 ,  H04B2210/078 ,  H04J14/0201 ,  H04J14/0221

摘要： A computer for controlling a pre-emphasis process is provided at end terminal stations which are the terminal stations of a trunk. When a pre-emphasis process is performed to an optical signal directing from a terminal station to another terminal station, the computer of the terminal station controls the process. First, the terminal station causes another terminal station to transmit the spectrum information of the thus-received optical signal, and receives the information. The terminal station obtains the spectrum information of its own received optical signal. The terminal station arranges data for each transmission source of the received optical signal, and calculates the amount of a pre-emphasis process to be performed at a transmission side. The terminal station transmits pre-emphasis execution instructions to the other terminal stations according to the thus-calculated results.

摘要翻译： 在作为中继线的终端站的终端站提供用于控制预加重处理的计算机。 当对从终端站到另一终端站的光信号执行预加重处理时，终端站的计算机控制该过程。 首先，终端站使另一个终端站发送这样接收的光信号的频谱信息，并接收该信息。 终端获取其自己接收的光信号的频谱信息。 终端机对接收的光信号的每个发送源进行数据的配置，并计算在发送侧进行的预加重处理的量。 终端根据这样计算的结果将预加重执行指令发送到其他终端站。

公开(公告)号：US06301032B1

公开(公告)日：2001-10-09

申请号：US09039566

申请日：1998-03-16

申请人： Takeo Osaka ,  Shin-ichirou Harasawa

发明人： Takeo Osaka ,  Shin-ichirou Harasawa

IPC分类号： H04J1402

CPC分类号： G02B6/2932 ,  G02B6/29356 ,  G02B6/2938 ,  H04J14/0206 ,  H04J14/0213

摘要： A circulator guides wavelength multiplexed light that is received from a main transmission path to a 1st fiber grating. The 1st fiber grating reflects light of wavelength &lgr;1. Wavelength multiplexed light that has passed through the 1st fiber grating is guided to a 2nd fiber grating. The 2nd fiber grating reflects light of wavelength &lgr;n. The circulator guides the signal light that has been reflected from the 1st and 2nd fiber gratings to a branch transmission path. The length of the transmission path between the 1st and 2nd fiber gratings is determined based on the transmission rate or frequency of the signal that is transmitted using light of wavelength &lgr;n.

摘要翻译： 循环器引导从主传输路径接收到第一光纤光栅的波长复用光。 第一光纤光栅反射波长lambd1的光。 通过第一光纤光栅的波长复用光被引导到第二光纤光栅。 第二光纤光栅反射波长lambdn的光。 循环器将已经从第一和第二光纤光栅反射的信号光引导到分支传输路径。 基于使用波长lambdn的光发送的信号的传输速率或频率来确定第一和第二光纤光栅之间的传输路径的长度。

公开(公告)号：US06980745B2

公开(公告)日：2005-12-27

申请号：US10014442

申请日：2001-12-14

申请人： Hiroyuki Deguchi ,  Shin-ichirou Harasawa ,  Izumi Yokota

发明人： Hiroyuki Deguchi ,  Shin-ichirou Harasawa ,  Izumi Yokota

IPC分类号： G02F1/35 ,  H01S3/30 ,  H04B10/035 ,  H04B10/07 ,  H04B10/077 ,  H04B10/29 ,  H04B10/291 ,  H04B10/54 ,  H04B10/58 ,  H04B17/40 ,  H04B10/16

CPC分类号： H04B10/2918 ,  H04B10/0771 ,  H04B10/0777 ,  H04B10/2916 ,  H04B2210/074 ,  H04B2210/078

摘要： An optical transmission system ensuring high-quality monitor control even if an optical fiber fault occurs. A monitor instruction sending unit sends a monitor instruction. An operating condition recognizing unit receives a response signal and recognizes the operating condition. A filtering unit filters the monitor instruction and the response signal. A monitor control unit monitors the operating condition of its own repeater in response to the monitor instruction, and generates resultant response information. A pump unit generates a pump light to cause Raman amplification within an optical fiber transmission medium. A regeneration control unit performs a regeneration control of the response signal to thereby create a regenerated signal. A modulation control unit modulates the pump light by the response information or the regenerated signal to thereby generate the response signal.

摘要翻译： 即使出现光纤故障，光传输系统也能保证高质量的监控。 监视器指令发送单元发送监视指令。 操作条件识别单元接收响应信号并识别操作条件。 滤波单元过滤监视指令和响应信号。 监视器控制单元响应于监视指令来监视其自身中继器的工作状态，并产生合成响应信息。 泵单元产生泵浦光以在光纤传输介质内引起拉曼放大。 再生控制单元执行响应信号的再生控制，从而产生再生信号。 调制控制单元通过响应信息或再生信号来调制泵浦光，从而产生响应信号。

公开(公告)号：US06847788B2

公开(公告)日：2005-01-25

申请号：US09749419

申请日：2000-12-28

申请人： Isao Nakajima ,  Shin-ichirou Harasawa

发明人： Isao Nakajima ,  Shin-ichirou Harasawa

IPC分类号： H04B10/2507 ,  H04B10/07 ,  H04B10/2543 ,  H04B10/294 ,  H04J14/00 ,  H04J14/02 ,  H04B10/12

CPC分类号： H04J14/0279 ,  H04B10/2941 ,  H04J14/0221 ,  H04J14/0226 ,  H04J14/0246 ,  H04J14/025

摘要： In a WDM optical communication system, at least one optical tunable filter is placed along an optical fiber provided as an optical transmission path between a transmitting station and a receiving station. The optical tunable filter has a controllable transmission factor versus wavelength characteristic. In the receiving station, the transmission characteristics (for example, optical signal to noise ratios and Q factors) for optical signals of different wavelengths propagated over the optical fiber are measured. The measurements are sent to the transmitting station. The transmitting station then properly controls both the amounts of pre-emphasis in the transmitting station and the wavelength characteristic of the optical filter on the basis of the measurements to thereby equalize the transmission characteristics for the optical signals. In this case, it is also possible to calculate the optimum proportion of allocation of control between the pre-emphasis control and the filter control and then perform the pre-emphasis control and the filter control according to the optimum proportion of allocation. In this control, the main controller may be either the transmitting station or the receiving station.

摘要翻译： 在WDM光通信系统中，沿着作为发送站和接收站之间的光传输路径提供的光纤放置至少一个光可调滤波器。 光可调谐滤波器具有可控的传输因子与波长特性。 在接收站中，测量在光纤上传播的不同波长的光信号的传输特性（例如光信噪比和Q因子）。 测量被发送到发射站。 然后，发送站根据测量结果适当地控制发送站中的预加重量和光滤波器的波长特性，从而使光信号的传输特性相等。 在这种情况下，也可以计算预加重控制和滤波器控制之间的控制分配的最佳比例，然后根据分配的最佳比例执行预加重控制和滤波器控制。 在该控制中，主控制器可以是发送站或接收站。

公开(公告)号：US06807370B2

公开(公告)日：2004-10-19

申请号：US09929361

申请日：2001-08-15

申请人： Shin-ichirou Harasawa

发明人： Shin-ichirou Harasawa

IPC分类号： H04B1008

CPC分类号： H04B10/0791 ,  H04B10/07 ,  H04B10/071

摘要： An optical transmission system with a mechanism to locate a fault on a transmission line effectively and efficiently to ensure the quality of communication between end stations and repeaters. Repeaters respond to a monitoring control command sent from an end station, returning a monitoring report signal that indicates their current operating status and input/output signal conditions. In the end station, a monitoring report processor identifies a faulty link section of the optical transmission line, if the monitoring report signal indicates a fiber fault. The end station sends a troubleshooting control command to cause a relevant repeater to transmit a probing light pulse signal and a complementary light pulse signal simultaneously in opposite directions. Some of the probing light pulse is reflected back as a result of Rayleigh scattering. The end station locates the fiber fault by analyzing the backscatter, using the complementary light pulse signal for synchronization.

摘要翻译： 一种光传输系统，具有有效和高效地定位传输线上的故障的机制，以确保终端站和转发器之间的通信质量。 中继器响应从终端发送的监视控制命令，返回一个监视报告信号，指示其当前的运行状态和输入/输出信号条件。 在终端中，如果监视报告信号表示光纤故障，则监视报告处理器识别光传输线路的故障链路部分。 终端发送故障排除控制命令，使相关中继器在相反方向同时发送探测光脉冲信号和补充光脉冲信号。 探测光脉冲中的一些由于瑞利散射而被反射回来。 终端通过分析反向散射来定位光纤故障，使用补充光脉冲信号进行同步。