Method and device for controlling bias operating point of modulator

An embodiment of the invention discloses a method for controlling a bias operating point of a modulator. The method comprises the steps of: determining a disturbance signal to be applied to a phase modulation electrode of the modulator according to inherent characteristics of the modulator, wherein the disturbance signal is a specific time-varying periodic voltage signal; detecting a signal component with the same frequency as the disturbance signal from an output signal of an output end of the modulator; and adjusting an initial bias voltage according to the amplitude of the signal componentso as to determine the bias operating point of the modulator. The embodiment of the invention further provides a device for controlling the bias operating point of the modulator. 本申请实施例公开了一种调制器的偏置工作点的控制方法，包括：根据所述调制器的固有特性，确定待施加在所述调制器的调相电极上的扰动信号；其中，所述扰动信号为特定时变周期性的电压信号；从所述调制器的输出端的输出信号中，检测与所述扰动信号的频率相同的信号分量；根据所述信号分量的幅度，调节所述初始偏置电压，以确定所述调制器的偏置工作点。本申请实施例还同时提供了一种调制器的偏置工作点的控制装置。