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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。
Polarization Non-reciprocal error is one of the main sources of error in fiber optic gyroscopes. The polarization nonreciprocal error contained in the two orthogonal polarization states of the dual-polarization fiber optic gyroscope has the sign of opposite sign, so the optical domain compensation can be used to suppress the polarization nonreciprocal error. Based on the theory and model of double-polarization fiber gyroscope, the effect of light source characteristics on the performance of dual-polarization fiber optic gyroscope is studied. It is found that light source with small coherence length and low polarization (DOP) is good for compensating polarization nonreciprocal error and improving the performance of dual- Long-term stability performance. Experiments show that the use of super-polarized fiber light source or depolarized superluminescent diode in dual-polarization fiber optic gyroscope can effectively compensate the polarization nonreciprocal error.