Method and device for optical carrier suppression modulation

Abstract

An embodiment of the present application provides a method and device for optical carrier suppression modulation, wherein the method includes: receiving an optical signal to be processed, and splitting the optical signal to be processed to obtain a first branch split signal and a second branch split signal, The optical signal to be processed is a single-polarized optical signal; performing optical carrier suppression modulation on the first branch demultiplexed signal to obtain a first modulated optical carrier, and performing power adjustment and phase adjustment on the second branch demultiplexed signal to obtain a compensated optical carrier; wherein , the first modulated optical carrier includes an unsuppressed optical carrier, and the compensated optical carrier is used to interfere with the first modulated optical carrier to cancel the unsuppressed optical carrier; The carrier is combined with light to obtain a second modulated optical carrier. The optical carrier suppression modulation method provided in the embodiment of the present application suppresses the residual optical carrier and improves the performance of the optical carrier suppression modulation.

Description

technical field [0001] The embodiments of the present application relate to the technical field of optical communication, and in particular, to a method and device for optical carrier suppression modulation. Background technique [0002] In high-speed optical network systems, optical carrier suppression modulation technology is often used. The so-called optical carrier suppression modulation technology refers to that after the optical carrier is modulated, the optical carrier component does not contain any information and occupies a large proportion of the entire modulated signal power, resulting in a great waste of transmission power. Therefore, the optical carrier is suppressed before transmission, so that the transmission power of the transmitter can be greatly saved without affecting the transmission information. For example, generation of carrier-suppressed return-to-zero (CSRZ), quadrature phase shift keying (Quadrature Phase Shift Keyin, QPSK) signals and quadrature ...

AI Technical Summary

Problems solved by technology

[0004] However, when using Mach-Zehnder modulator or IQ modulator for optical carrier suppression modulation, the optical carrier cannot be completely suppressed after modulation, and there is still a residual optical carrier

Causes waste of transmit power, reduces signal modulation quality and signal transmission performance

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