Method and device for controlling bias voltage of mz modulator

Abstract

One or more embodiments of this specification provide a method and device for controlling the bias voltage of an MZ modulator. The control method includes modulating the electrical signal to be modulated onto a continuous optical signal of a fixed wavelength through the MZ modulator; The optical signal is modulated for light splitting to obtain a first optical signal; the first optical signal is converted into a first electrical signal; the first electrical signal is processed using a proportional-integral-differential PID control algorithm to obtain a working point suitable for the MZ modulator Bias voltage signal; the bias voltage signal is applied to the MZ modulator to adjust the operating point of the MZ modulator. In the embodiment of the present invention, the electrical signal is modulated onto the optical signal to transmit the electrical signal, and then the electrical signal is adjusted by the PID control algorithm, which not only simplifies the steps of modulation, but also effectively reduces the modulation time of the modulated signal. The interference received in the process effectively solves the DC drift problem of the bias point of the MZ modulator and stabilizes the working point of the MZ modulator.

Description

technical field [0001] One or more embodiments of this specification relate to the technical field of optical fiber communication, and in particular to a method and device for controlling a bias voltage of an MZ modulator. Background technique [0002] With the development of science and technology, optical fiber communication has become the mainstream of modern networks, in which the control and adjustment of bias voltage plays an important role. The voltage that should be set across the collector-base. [0003] At present, the mature and large-scale use of the bias voltage control method in the market is the pilot method, which mainly modulates the intensity of the pilot signal (low frequency signal) and the modulation signal, and then conducts harmonic analysis. The modulation signal is also low frequency When the signal is used, the two signals will interfere with each other, so that the pilot method is invalid, and it is difficult to solve the DC drift of the bias poin...

AI Technical Summary

Problems solved by technology

[0004] In view of this, the purpose of one or more embodiments of this specification is to propose a method and device for controlling the bias voltage of an MZ modulator to solve the problem of DC drift of the bias point

Images