双偏振光纤陀螺光源特性研究

偏振非互易误差是光纤陀螺中的主要误差来源之一。双偏振光纤陀螺中两正交偏振态所含偏振非互易误差存在反号特性，因此可利用光域补偿抑制偏振非互易误差。基于双偏振光纤陀螺理论和模型，研究光源特性对双偏振光纤陀螺性能的影响，发现相干长度小且偏振度（DOP）低的光源有利于补偿偏振非互易误差，从而改善双偏振光纤陀螺的长时间稳定性性能。实验表明，双偏振光纤陀螺中采用超荧光光纤光源或消偏的超辐射发光二极管，可实现偏振非互易误差的有效补偿。

Abstract

Polarization nonreciprocal phase error is one of major errors in fiber optic gyroscope (FOG). In dual polarization FOG, the polarization nonreciprocal phase error in two orthogonal polarization modes possesses opposite signs, which can be compensated optically. The influences of light source on performance of dual polarization FOG are discussed based on the dual polarization FOG theory and model, which shows that the bias stability of dual polarization FOG is improved by short coherence length and low degree of polarization (DOP). Experiment results show that super luminescent diode (SLD) or super-fluorescent sources (SFS) can be adopted to compensate polarization nonreciprocal error effectively under conditions of short coherence length and low DOP in dual polarization FOG.

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