Method and device for controlling the bias voltage of a phase-shift-keying optical modulator

摘要

A method and a device for controlling the phase-shift bias voltage and the operating point bias voltage of a phase-shift-keying optical modulator are provided. The method includes the steps of obtaining an output signal of the optical modulator; obtaining information about a relation between the output signal of the optical modulator and a noise signal contained in the output signal; analyzing the relation information between the output signal and the noise signal to obtain control information of a phase-shift bias voltage; and obtaining a current phase-shift bias voltage according to the control information, and loading the current phase-shift bias voltage on the optical modulator. In the present invention, the method for controlling a bias voltage of an optical modulator has an automatic feedback regulation function and can regulate a bias voltage of a À/2 phase shift unit of the optical modulator, so that the stability of the output signal of the optical modulator is increased.