Study on the multi-signal processing performance of optical coherent detection systems
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摘要: 针对复杂而密集的电磁环境下多信号共存与传输的特点,为解决光学相干接收系统多信号的同时处理能力,基于声光偏转原理,设计了采用声光偏转技术和光纤相干光探测相结合的测频系统,对不同频率信号的声光互作用和光束偏转进行分析,通过对多频互调的数值仿真,给出了减小多信号互作用下互调现象的解决方案。构建了实验平台,将空间光注入到光纤进行信号复用和传输处理。结果表明,系统对信号的实时捕获能力强,在系统带宽内实现了多信号载频的同时测量,经测试频率分辨率优于0.1MHz,截获率为100%。Abstract: In order to solve multi-signal processing simultaneously in an optical coherent receiver system,a frequency measurement system that employs acousto-optic deflection technology and fiber-based coherent optical detection was designed based on acousto-optic deflection principle and characteristics of multiple signals co-existing and transmitting in the complex and dense electromagnetic environment.The acousto-optic interaction and beam deflection of different frequency signals were analyzed in theory.Through numerical simulation of multi-frequency intermodulation,the solution of reducing intermodulation of multiple signals was obtained.An experimental platform for handling multiple signals was constructed with space light injecting into fiber. Experimental result shows that real-time signal capture capability of the system is very strong and carrier frequency measurement of multi-signal can be realized in the system bandwidth.The test data displays that the frequency resolution is less than 0.1 MHz and the interception rate is up to 100%.
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