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    • 1. 发明授权
    • Optical modulation apparatus and method of controlling
    • 光调制装置及光调制器的方法
    • US06278539B1
    • 2001-08-21
    • US09348166
    • 1999-07-07
    • Hiroki OoiHiroshi NakamotoGeorge IshikawaTakuji YamamotoYoshinori Nishizawa
    • Hiroki OoiHiroshi NakamotoGeorge IshikawaTakuji YamamotoYoshinori Nishizawa
    • G02B2600
    • G02F1/0123G02F2203/21
    • An optical modulator having a voltage—optical output characteristic in which optical output varies periodically with respect to a voltage value of an electrical drive signal is driven by a modulator driving voltage signal, which has an amplitude of 2·V&pgr; between two light-emission culminations or two light extinction culminations of the voltage—optical output characteristic. A low-frequency superimposing unit superimposes a prescribed low-frequency signal on the modulator driving voltage signal, and an operating-point controller controls the operating point of the optical modulator by detecting operating-point drift of the optical modulator based upon the low-frequency signal component contained in an optical signal output from the optical modulator and controlling the bias voltage of the optical modulator in dependence upon the drift of the operating point of the optical modulator.
    • 一种具有电压 - 光输出特性的光调制器,其中光输出相对于电驱动信号的电压值周期性变化,由调制器驱动电压信号驱动,该调制器驱动电压信号在两个发光峰值之间具有2.Vpi的幅度 或电压 - 光输出特性的两个光消光结束。 低频叠加单元将规定的低频信号叠加在调制器驱动电压信号上,工作点控制器通过基于低频来检测光调制器的工作点漂移来控制光调制器的工作点 信号分量包含在从光调制器输出的光信号中,并且根据光调制器的工作点的漂移来控制光调制器的偏置电压。
    • 9. 发明授权
    • Optical wavelength controlling method and a system thereof
    • 光波长控制方法及其系统
    • US07725033B2
    • 2010-05-25
    • US11319231
    • 2005-12-28
    • Hiroshi Nakamoto
    • Hiroshi Nakamoto
    • H04B10/00H04B10/08H04B10/04H04J14/02
    • H04J14/0221H04J14/02
    • An optical wavelength controlling method and a system thereof for an optical wavelength division multiplexing transmission system, wherein a plurality of wavelengths of channels are multiplexed and transmitted by an optical transmitting unit, and the multiplexed wavelengths are divided into the wavelengths of the channels by an optical receiving unit, are disclosed.The optical wavelength controlling method includes:a step of reducing optical power of the wavelength of a target channel, and transmitting the wavelengths;a step of evaluating channel crosstalk based on a code error rate of a channel adjacent to the target channel, and detecting a shift of the wavelength of the target channel; anda step of compensating for the shift of the wavelength of the target channel.
    • 一种用于光波分复用传输系统的光波长控制方法及其系统,其中多个波长的信道由光发射单元复用和传输,并且多路复用的波长被光学分为信道的波长 接收单元。 光波长控制方法包括:降低目标信道的波长的光功率并发射波长的步骤; 基于与目标信道相邻的信道的码错误率来评估信道串扰,并检测目标信道的波长的移位的步骤; 以及补偿目标通道的波长的偏移的步骤。