Coherent light communication system and method for high-speed PON

Abstract

A coherent light communication system and method for a high-speed PON, the system comprising: a first optical transmitter, a first wavelength division multiplexer WDM, a second wavelength division multiplexer WDM, a first optical receiver, a second optical transmitter and a second optical receiver, in which both the first optical transmitter and the second optical transmitter use auxiliary light waves to reversely inject SOA, facilitating linearization of SOA optical gain; a first optical receiver of a downlink ONU jointly uses optical polarization tracking and optical injection to lock a local laser and an optical phase-locked loop, so that optical phase noise is minimized, and homodyne detection is realized; in a second optical receiver of the OLT in the uplink direction, an optical polarization tracking technology is combined with an optical mixing module and a quadratic sum arithmetic unit, a complex frequency estimation and phase estimation algorithm in a traditional digital signal processor is abandoned, and inner difference detection with frequency offset and optical phase noise nonlinear offset functions is realized. Hardware and a signal processing method of the coherent receiver are simplified.

Description

technical field [0001] The present application relates to the technical field of optical communication, in particular to a coherent optical communication system used in a high-speed passive optical network (PON), and also to a communication method of the system. Background technique [0002] At present, the take-off of communication capacity has led to the fact that the direct detection of the light wave envelope (electric field amplitude) alone is not enough to solve the problem of information carrying. However, due to the complexity and cost of the hardware and software of the optical coherent detection technology, the optical coherent communication system has only been applied to ultra-long The land and submarine cable trunk lines have not been commercially available in the optical access network. [0003] The advantage of optical coherent detection is that the output voltage of the optical receiver is proportional to the multiplication of the optical field of the receive...

AI Technical Summary

Problems solved by technology

[0004] The present application provides a coherent optical communication system and method for high-speed PON to solve the problem that the existing coherent optical communication hardware system has complex structure, high cost, high power consumption and complicated communication methods, which are not suitable for use in high-speed PON question

Images