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    • 8. 发明专利
    • Distributed raman amplifier and wdm optical transmission system
    • 分布式拉曼放大器和波分复用光传输系统
    • JP2008182679A
    • 2008-08-07
    • JP2007321775
    • 2007-12-13
    • Fujitsu Ltd富士通株式会社
    • SUGAYA YASUSHI
    • H04B10/29G02F1/35H01S3/30H04B10/07H04B10/294H04J14/00H04J14/02
    • H01S3/302H01S3/06758H01S3/094096H01S3/10015H01S3/1301H01S3/1305H01S2301/04
    • PROBLEM TO BE SOLVED: To realize a low-cost distributed Raman amplifier of a simple configuration, capable of realizing an automatic gain-fixed control with high precision and also capable of compensating for gain wavelength characteristics using a fixed gain equalizer, and a WDM optical transmission system using the same. SOLUTION: In the distributed Raman amplifier, a WDM signal light and a reference light Lr are supplied to one end of an optical transmission path 2 to which pumping lights Lp1-Lp3 are supplied; the WDM signal light and the reference light, which are propagated through the optical transmission path 2, are subjected to the distributed Raman amplification; the powers of the WDM signal light and the reference light, which are output from the other end of the optical transmission path 2, are monitored; and pumping light sources 11-13 are controlled based on the monitor result. A wavelength of the reference light Lr is set within a gain band of the distributed Raman amplification but longer or shorter than a wavelength of the WDM signal light, and also, set to be in a wavelength region in which a fluctuation amount of a Raman gain generated in the wavelength of the reference light Lr becomes equal to or smaller than 1.5 of a fluctuation amount of a Raman gain generated in the wavelength band of the WDM signal light. COPYRIGHT: (C)2008,JPO&INPIT
    • 解决的问题:为了实现简单配置的低成本分布式拉曼放大器,能够以高精度实现自动增益固定控制,并且还能够使用固定增益均衡器来补偿增益波长特性,以及 一种使用其的WDM光传输系统。 解决方案:在分布式拉曼放大器中,将WDM信号光和参考光Lr提供给提供泵浦光Lp1-Lp3的光传输路径2的一端; 通过光传输路径2传播的WDM信号光和参考光经受分布式拉曼放大; 监视从光传输路径2的另一端输出的WDM信号光和参考光的功率; 并且基于监视器结果来控制泵浦光源11-13。 参考光Lr的波长被设定在分布式拉曼放大的增益带内,但比WDM信号光的波长长或短,并且也被设置在波长范围内,其中拉曼增益的波动量 在参考光Lr的波长中产生的波长为在WDM信号光的波长带中产生的拉曼增益的波动量的1.5以下。 版权所有(C)2008,JPO&INPIT
    • 9. 发明专利
    • Excitation light source unit and raman amplifier
    • 激光光源单元和拉曼放大器
    • JP2008158554A
    • 2008-07-10
    • JP2008076392
    • 2008-03-24
    • Sumitomo Electric Ind Ltd住友電気工業株式会社
    • INOUE MASAYUKIKAKUI MOTOKIMOBARA MASAICHI
    • G02F1/35H01S3/06H01S3/067H01S3/094H01S3/10H01S3/30H01S5/14
    • H04B10/2916H01S3/06754H01S3/094096H01S3/1003H01S3/302H01S5/146
    • PROBLEM TO BE SOLVED: To provide an excitation light source unit for Raman amplification or the like that is provided with a structure for adjusting an output signal light spectrum in an amplified wavelength band. SOLUTION: The excitation light source unit (LU) comprises a main excitation light supply system (1a) including N sets of excitation light sources (11a to 13a) to output excitation lights with N (>=2) channels having different wavelengths to each other, a multiplexer (2) for multiplexing the excitation lights having N channels, and an output structure (3) for supplying the excitation light output from the multiplexer (2) to an optical fiber (L) for Raman amplification. The excitation light source unit (LU) includes a preliminary excitation light supply system (1b) including N sets of excitation light sources (11b to 13b) at least one of which is a wavelength variable excitation light source and an optical switch (4), which optionally switches an output from one of the excitation light sources (11a to 13a) and outputs from the excitation light sources (11b to 13b). COPYRIGHT: (C)2008,JPO&INPIT
    • 要解决的问题:提供一种用于拉曼放大等的激发光源单元,其具有用于调节放大波段中的输出信号光谱的结构。 解决方案:激发光源单元(LU)包括主激励光供应系统(1a),其包括N组激发光源(11a至13a),以输出具有不同波长的N(> = 2)个通道的激发光 用于多路复用具有N个通道的激发光的多路复用器(2)和用于将从多路复用器(2)输出的激励光提供给用于拉曼放大的光纤(L)的输出结构(3)。 激励光源单元(LU)包括:初级激励光供给系统(1b),其包括N组激励光源(11b至13b),其中至少一个是波长可变激发光源和光开关(4), 其可选择地从一个激励光源(11a至13a)切换输出并从激励光源(11b至13b)输出。 版权所有(C)2008,JPO&INPIT