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研究了4路偏振切换技术在光纤干涉仪中的应用,建立了基于4路偏振切换的抗偏振衰落的理论模型,运用了复数运算的方法解决4路信号的合成问题,对偏振诱导信号衰落的抑制效果进行了仿真。偏振衰落实验搭建了基于非平衡的迈克尔孙干涉仪的实验系统,采用相位产生载波技术(PGC)外调制方案解调信号,对4路偏振切换技术抗偏振衰落效果进行了实验测试。结果表明,4路干涉信号合成后,可以消除传输光纤双折射的影响,合成干涉信号的解调结果与单路解调结果一致;合成干涉信号的等效干涉度可以稳定在0.838,验证了偏振切换技术抗偏振衰落的有效性。
The application of 4-polarization switching technology in optical fiber interferometer is studied. The theoretical model of polarization-dependent fading based on 4-way polarization switching is established. The complex operation method is used to solve the 4-channel signal synthesis problem. Suppression effects were simulated. Polarization Fading Experiment An experimental system based on the unbalanced Michelson interferometer was set up. The phase modulation carrier (PGC) modulation scheme was used to demodulate the signal, and the anti-polarization fading effect of the 4-polarization switching technology was experimentally tested. The results show that after the 4-way interference signal is synthesized, the influence of the birefringence of the transmission fiber can be eliminated. The demodulation result of the synthesized interference signal is consistent with that of the single channel demodulation. The equivalent interference of the synthesized interference signal can be stabilized at 0.838. The effectiveness of switching techniques against polarization fading.