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建立了基于3×3耦合器的光纤Mach-Zehnder(MZ)干涉型传感系统。在对3×3耦合器信号解调方案进行了推导和分析后,对干涉信号中偏振衰落现象进行了理论分析和实验研究,并指出了它对3×3耦合器信号解调方案的影响。针对偏振衰落现象的特点,提出了消除这一问题的方案,实现了干涉仪信号的无偏振衰落输出。
An optical fiber Mach-Zehnder (MZ) interference sensing system based on 3 × 3 coupler was established. After deducing and analyzing the demodulation scheme of 3 × 3 coupler signal, the phenomenon of polarization fading in the interference signal is theoretically analyzed and experimentally studied, and its influence on the signal demodulation scheme of 3 × 3 coupler is pointed out. Aiming at the characteristics of polarization fading phenomenon, a scheme to eliminate this problem is proposed, and the unpolarized fading output of the interferometer signal is achieved.