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    • 34. 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。