公开(公告)号：DE69627959T2

公开(公告)日：2003-11-27

申请号：DE69627959

申请日：1996-10-29

Applicant: NEC CORP

Inventor： AOKI YASUHIRO ,  OGATA TAKAAKI ,  YONEYAMA KENICHI ,  MICHISHITA YUKIO ,  SATO YOSHIRO

IPC: H01S3/10 ,  H01S3/13 ,  H01S3/06 ,  H04B10/17

Abstract: Optical surge preventing systems and methods for rare earth-doped optical fiber amplifiers are disclosed. The systems are so arranged as to cause any signal exist in a doped fiber section so as not to excite too much the rare earth elements in the doped fiber section. In one embodiment, a background signal light with such a wavelength as to cause induced emission in the doped fiber section is always coupled into the doped fiber section regardless of whether a message signal light exists or not. The background signal light may be generated by any suitable light source or a light spontaneously emitted from either end of the doped fiber section. In another embodiment, a dummy signal light is coupled into the doped fiber section if the level of the message signal light becomes less than a predetermined value. Coupling of the background signal light or the dummy signal light into the doped fiber section may be done from either of the message signal input and output sides.

公开(公告)号：DE69627959D1

公开(公告)日：2003-06-12

申请号：DE69627959

申请日：1996-10-29

Applicant: NEC CORP

Inventor： AOKI YASUHIRO ,  OGATA TAKAAKI ,  YONEYAMA KENICHI ,  MICHISHITA YUKIO ,  SATO YOSHIRO

IPC: H01S3/10 ,  H01S3/13 ,  H01S3/06 ,  H04B10/17

Abstract: Optical surge preventing systems and methods for rare earth-doped optical fiber amplifiers are disclosed. The systems are so arranged as to cause any signal exist in a doped fiber section so as not to excite too much the rare earth elements in the doped fiber section. In one embodiment, a background signal light with such a wavelength as to cause induced emission in the doped fiber section is always coupled into the doped fiber section regardless of whether a message signal light exists or not. The background signal light may be generated by any suitable light source or a light spontaneously emitted from either end of the doped fiber section. In another embodiment, a dummy signal light is coupled into the doped fiber section if the level of the message signal light becomes less than a predetermined value. Coupling of the background signal light or the dummy signal light into the doped fiber section may be done from either of the message signal input and output sides.

公开(公告)号：GB2384930B

公开(公告)日：2004-04-14

申请号：GB0301010

申请日：2003-01-16

Applicant: NEC CORP

Inventor： SATO YOSHIRO

IPC: H04J14/00 ,  H04B10/2525 ,  H04J14/02 ,  H04J14/04 ,  H04J14/06 ,  H04B10/18

Abstract: An orthogonal polarization multiplexing transmission apparatus capable of performing dispersion compensation considering a short wavelength side and a long wavelength side of a zero dispersion wavelength. A plurality of light signals of different wavelengths are divided into two orthogonal polarization multiplexing portions, and the light signals of an oddnumber array polarization multiplexing portion and an even-number array polarization multiplexing portion are orthogonal-polarization-multiplexed in each orthogonal polarization multiplexing portions. Adjacent light signals of the two orthogonal polarization multiplexing portions have their mutual planes of polarization rendered non-orthogonal when multiplexed by an optical multiplexer so that, for the purpose of deterring inter-symbol interference, a guard hand having the wavelength spacing rendered wider than that on orthogonal polarization multiplexing is provided in advance.

公开(公告)号：GB2384930A

公开(公告)日：2003-08-06

申请号：GB0301010

申请日：2003-01-16

Applicant: NEC CORP

Inventor： SATO YOSHIRO

IPC: H04J14/00 ,  H04B10/2525 ,  H04J14/02 ,  H04J14/04 ,  H04J14/06 ,  H04B10/18

Abstract: Orthogonal polarization multiplexing apparatus is provided capable of performing dispersion compensation for a short wavelength side and a long wavelength side of a zero dispersion wavelength. Several orthogonal polarization multiplexers 100, 200 are provided for orthogonally polarizing even wavelengths ( g 1-2, 1-4 etc) and odd wavelengths ( g 1-1, 1-3 etc) to produce several orthogonally multiplexed wavelength bands. Adjacent wavelengths of any two bands may not be orthogonal (see figure 3) and so a guard band is provided between adjacent bands having a spacing wider than the wavelength spacing within each band (figure 2). The guard band may be achieved by removing one of the band wavelengths using a notch filter. Each band then passes through a corresponding dispersion compensation fibre (DCF) 6-1, 6-2 and are combined at an optical multiplexer 9. A common dispersion compensator 10 for all wavelengths may be provided after combining. Application is to dense wavelength division multiplexing (DWDM).

公开(公告)号：JP2010206630A

公开(公告)日：2010-09-16

申请号：JP2009050861

申请日：2009-03-04

Applicant: Nec Corp ,  日本電気株式会社

Inventor： SATO YOSHIRO

IPC: H04B10/07 ,  H04B10/071 ,  H04B10/077 ,  H04B10/079 ,  H04B10/29

CPC classification number: H04J14/0275 ,  H04B10/0771 ,  H04B10/0791 ,  H04B2210/078 ,  H04J14/0213 ,  H04J14/0256 ,  H04J14/028 ,  H04J14/0287 ,  H04J14/0289

Abstract: PROBLEM TO BE SOLVED: To provide an apparatus and a method for evaluating a failure in a transmission line optical fiber, in which the failure in the transmission line optical fiber is evaluated in a short time by means of a wavelength division multiplex (WDM) device which transmits an SV signal containing wavelength reception interruption information and SV wavelength reception interruption information of a present station and collects wavelength reception interruption information and SV wavelength reception interruption information of the other station.
SOLUTION: The apparatus includes: a detection means for detecting information on signal wavelength interruption and SV wavelength interruption of the present station; a transfer means for periodically transferring the information detected by the detection means to the other station, a collection means for periodically receiving and collecting, in the present station, information on wavelength interruption and SV wavelength interruption detected by the other station; and an evaluation means for evaluating the failure in the transmission line optical fiber based on the information detected by the detection means and the information collected by the collection means.
COPYRIGHT: (C)2010,JPO&INPIT

Abstract translation: 要解决的问题：提供一种用于评估传输线光纤中的故障的装置和方法，其中通过波分复用在短时间内评估传输线光纤的故障（ WDM）装置，其发送包含本台的波长接收中断信息和SV波长接收中断信息的SV信号，并收集另一台的波长接收中断信息和SV波长接收中断信息。 解决方案：该装置包括：用于检测本台站的信号波长中断和SV波长中断的信息的检测装置; 用于周期性地将由检测装置检测到的信息传送到另一个站的传送装置，用于在本站周期性地接收和收集关于由另一个站检测的波长中断和SV波长中断的信息的收集装置; 以及评估装置，用于基于由检测装置检测到的信息和由收集装置收集的信息来评估传输线光纤中的故障。 版权所有（C）2010，JPO＆INPIT

公开(公告)号：JP2008306677A

公开(公告)日：2008-12-18

申请号：JP2007154431

申请日：2007-06-11

Applicant: Nec Corp ,  日本電気株式会社

Inventor： SATO YOSHIRO

IPC: H04J14/00 ,  H04B10/07 ,  H04B10/27 ,  H04B10/29 ,  H04J14/02

CPC classification number: H04J14/0221 ,  H04J14/0226

Abstract: PROBLEM TO BE SOLVED: To provide a wavelength multiplex transmitting device capable of suppressing the variation of a gain profile.
SOLUTION: In the wavelength multiplex transmitting device, wherein the transmission wavelength band of a transmission line is divided into a plurality of wavelength bands (e.g. wavelength band 1, wavelength band 2) and signal light is transmitted with the divided wavelength band (wavelength band 1, wavelength band 2) as a transmission unit, light source means (106, 206) are disposed for outputting dummy light to each divided wavelength band (wavelength band 1, wavelength band 2), and output power of the dummy light to be outputted from the light source means (106) is controlled so as to fix power of multiplexed light after multiplexing the signal light of the divided wavelength band (wavelength band 1) and the dummy light.
COPYRIGHT: (C)2009,JPO&INPIT

Abstract translation: 要解决的问题：提供能够抑制增益曲线的变化的波长多路复用发送装置。 解决方案：在波分复用发送设备中，其中传输线的传输波长带被划分成多个波长带（例如，波长带1，波段2），信号光以分频波段（ 波长带1，波长带2）作为发送单元，设置有用于将虚拟光输出到每个分割波长带（波长带1，波长带2）和虚拟光的输出功率的光源装置（106,206） 控制从光源装置（106）输出的光，以便在对分割波长带（波长带1）的信号光和虚拟光进行多路复用之后固定复用光的功率。 版权所有（C）2009，JPO＆INPIT

公开(公告)号：JP2003209532A

公开(公告)日：2003-07-25

申请号：JP2002006863

申请日：2002-01-16

Applicant: NEC CORP

Inventor： SATO YOSHIRO

IPC: H04J14/00 ,  H04B10/2525 ,  H04J14/02 ,  H04J14/04 ,  H04J14/06

Abstract: PROBLEM TO BE SOLVED: To provide an orthogonally polarized wave multiplex transmitter capable of performing dispersion compensation for which the short wavelength side and the long wavelength side of zero dispersion wavelength are taken into consideration. SOLUTION: A plurality of the optical signals of different wavelengths are divided into orthogonally polarized wave multiplex parts 100 and 200 and the optical signals of an odd number array polarized wave multiplex part and an even number array polarized wave multiplex part are orthogonally polarized wave multiplexed in the respective orthogonally polarized wave multiplex parts. For the adjacent optical signals of the orthogonally polarized wave multiplex parts 100 and 200, since the polarization planes of each other become non- orthogonal at the time of being multiplexed in an optical multiplexer 9, a guard band for which a wavelength interval is opened wider than the one at the time of the orthogonally polarized wave multiplex beforehand for the purpose of suppressing inter-code interference is provided. The multiplex optical signals of the orthogonally polarized wave multiplex part 100 are band dispersion compensated in a dispersion compensator 6-1 and the multiplex optical signals of the orthogonally polarized wave multiplex part 200 are also band dispersion compensated in a different dispersion compensator 6-2. The respective multiplex optical signals are multiplexed in the optical multiplexer 9 and then dispersion compensated altogether in a dispersion compensator 10. COPYRIGHT: (C)2003,JPO

公开(公告)号：JPH09321373A

公开(公告)日：1997-12-12

申请号：JP13847496

申请日：1996-05-31

Applicant: NEC CORP

Inventor： SATO YOSHIRO

IPC: H01S3/07 ,  H01S3/06 ,  H01S3/067 ,  H01S3/10 ,  H04B3/46 ,  H04B10/07 ,  H04B10/079 ,  H04B10/293 ,  H04B10/08

Abstract: PROBLEM TO BE SOLVED: To detect whether a dummy light is below the level of a signal light or cut off and send the dummy light to a rare earth element-added fiber of an optical amplifier by providing an optical coupler for applying the dummy light sent from a dummy optical source to this fiber after branching a signal light to be fed to the optical amplifier and detecting the signal light. SOLUTION: The optical signal monitor circuit has an optical brancher 11 at the signal light input which is connected to an optical detector O/E 12 for detecting a branched signal light. An electric signal output of the detector is coupled to a signal light detector circuit 13 to which a dummy optical source drive circuit 14 is connected to drive or stop a dummy optical source according to the signal level. The dummy source 15 is connected to an optical coupler 17 through an optical isolator 16. An optical multiplexer 16 is disposed to send the dummy light to an Er-added optical fiber reverse to the signal light whereby the monitor circuit detects whether the dummy light is below the level of the signal light or cut off and sends the dummy light to the rare earth element- added fiber.

公开(公告)号：JP2009212673A

公开(公告)日：2009-09-17

申请号：JP2008052049

申请日：2008-03-03

Applicant: Nec Corp ,  日本電気株式会社

Inventor： SATO YOSHIRO

IPC: H04J14/00 ,  H04B10/07 ,  H04B10/2513 ,  H04B10/27 ,  H04B10/29 ,  H04J14/02

CPC classification number: H04J14/02 ,  H04J14/0246 ,  H04J14/025 ,  H04J14/0256 ,  H04J14/0279

Abstract: PROBLEM TO BE SOLVED: To provide a device which mounts an optical band-pass filter in an optical wavelength dividing and multiplexing system and changes a center wavelength and a band width of the optical band-pass filter according to an optical wavelength band to be transmitted, and to provide a control method. SOLUTION: The optical wavelength multiplexing device 100 includes: a CPL (multiplexing portion) 3 which multiplexes optical signals and outputs the multiplexed optical signals; a BPF (optical band-pass filter) 9 which can change the center frequency and the band width, and inputs an optical signal outputted from the CPL 3; a storage portion which stores wavelength-band control information 4 which specifies the center wavelength and the band width; and a control circuit 10 which controls the center frequency and the band width of the BPF 9 based on the wavelength-band control information 4. The control circuit 10 controls the center frequency and the band width of the BPF 9 based on the wavelength-band control information 4. COPYRIGHT: (C)2009,JPO&INPIT

Abstract translation: 解决的问题：提供一种在光波分复用系统中安装光学带通滤波器并根据光波长带改变光带通滤波器的中心波长和带宽的装置 被传送，并提供控制方法。 解决方案：光波分复用装置100包括：多路复用光信号并输出​​复用的光信号的CPL（复用部分）3; 可以改变中心频率和带宽的BPF（光学带通滤波器）9，并输入从CPL 3输出的光信号; 存储部，其存储规定中心波长和带宽的波长带控制信息4; 以及控制电路10，其基于波长带控制信息4控制BPF 9的中心频率和带宽。控制电路10基于波长带控制信息4控制BPF 9的中心频率和带宽 控制信息4.版权所有（C）2009，JPO＆INPIT

公开(公告)号：JP2001044970A

公开(公告)日：2001-02-16

申请号：JP21163499

申请日：1999-07-27

Applicant: NEC CORP

Inventor： SATO YOSHIRO

IPC: H04J14/00 ,  H04B10/07 ,  H04B10/079 ,  H04B10/293 ,  H04B10/296 ,  H04B10/564 ,  H04B10/572 ,  H04J14/02 ,  H04B10/04 ,  H04B10/06 ,  H04B10/08 ,  H04B10/14

Abstract: PROBLEM TO BE SOLVED: To monitor the output level of each wavelength in a wavelength multiplex transmitting device, to optionally set the output level without an operator's operating the output levels of optical amplifiers separately with manual operation and to automatically control the output level. SOLUTION: Signal light of a different wavelength is subjected to wavelength multiplexing by a wavelength multiplexing technique and outputted. In such a case, optical amplifiers 1 and 2 which separately amplify each signal light before wavelength multiplexing are provided, their output levels, each wavelength after the wavelength multiplexing and the output level of each wavelength are measured and monitored, and the output level of each of the amplifiers 1 and 2 is automatically controlled to be a target value for the output level set target value of each wavelength after the wavelength multiplexing.