A method and device for differential quadrature phase shift keying demodulator locking

Abstract

The present invention is applicable to the field of optical communication, and provides a method and a device for locking a differential quadrature-phase shift keying demodulator, the method comprising: acquiring an optical differential quadrature-phase shift keying signal, and acquiring the optical differential quadrature the frequency of the shift keying signal when there is no perturbation signal; according to the frequency of the optical differential quadrature shift keying signal when there is no perturbation signal, determine whether the optical differential quadrature shift keying signal contains a polarization interference signal; if it contains , then obtain the frequency of the polarization interference signal; set the frequency of the disturbance signal to a frequency different from the frequency of the polarization interference signal; load the set disturbance signal into the optical differential four-phase shift key control signal. In the embodiment of the present invention, the frequency of the optical DPQSK when there is no disturbance signal is obtained, and the frequency of the disturbance signal is set to be different from the frequency of the polarization disturbance signal, so that the frequency of the disturbance signal avoids the frequency of the polarization disturbance signal, and the locking of the wavelength of the optical DPQSK is realized. .

Description

technical field [0001] The invention belongs to the field of optical communication, and in particular relates to a locking method and device for a differential four-phase-shift keying demodulator. Background technique [0002] DQPSK (Diffential Quad Phase Shifting Key, referred to as Differential Quad Phase Shift Keying) is a modulation format of optical signals. Optical signals modulated by DQPSK format can realize fast propagation of optical signals. When using DQPSK to modulate an optical signal, the wavelength of the optical signal must be locked to realize DQPSK modulation of the optical signal. [0003] In the prior art, the wavelength locking of the optical DQPSK signal can be realized through the disturbance signal, but when the frequency of the polarization interference signal of the optical signal is the same or similar to the frequency of the disturbance signal, the polarization interference signal will affect the frequency of the optical differential quadrature p...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the embodiment of the present invention is to provide a method and device for locking a differential quadrature phase shift keying demodulator, so as to solve the problem in the prior art that optical DQPSK cannot be locked when the frequency of the optical polarization interference signal is similar to the frequency of the disturbance signal The problem with the wavelength of the signal

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