Feedback control system and method for controlling output light intensity of dual-parallel MZM modulator

Abstract

The invention discloses a feedback control system and method for controlling output light intensity of a dual-parallel MZM modulator. The input end of an optical fiber coupler of the feedback control system is connected with an output end of the dual-parallel MZM modulator, the input end of an optical receiving module of the feedback control system is connected with a secondary output end of the optical fiber coupler, the output end of the optical receiving module is connected with the input end of an A / D converter, two output ends of the A / D converter are connected with one input end of a digital comparator and the input end of a memory respectively, the output end of the memory is connected with the other input end of the digital comparator, the output end of the digital comparator is connected with the input end of a microprocessor, and the output end of the microprocessor is connected with the power source end of the dual-parallel MZM modulator through a D / A converter. The feedback control system and method for controlling the output light intensity of the dual-parallel MZM modulator can carry out real-time monitoring on output optical power of the dual-parallel MZM modulator, signals are fed back to control the dual-parallel MZM modulator through the feedback control system, the output power can be constant, and system performance can be optimal.

Description

technical field [0001] The invention relates to microwave photon link technology, in particular to a feedback control system and method for controlling the output light intensity of a double-parallel MZM modulator. Background technique [0002] With the rapid development of Internet services and interactive multimedia services such as IPTV and video on demand (VOD), wireless communication systems have developed from traditional voice services to a new stage. There is an urgent need for simple, reliable and low-cost wireless communication services that can provide any media at any time and any place. With the continuous increase of users and bandwidth requirements, the available wireless spectrum resources will soon be exhausted, so broadband wireless communication technology must be extended to higher frequencies. In the optical fiber communication system, the laid optical fiber cables have not been fully utilized, and there are a large number of idle bandwidth resources. H...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problems of the dual-parallel MZM (Mach-Zehnder) modulator due to the accumulation of heat generated by long-term voltage application, which will cause the output optical power of the modulator to drift, the working state will change, and the performance will decline. Feedback control system and method for output light intensity of dual parallel MZM modulators

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