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建立了布里渊光纤陀螺环形腔中泵浦光及布里渊激光的偏振传输模型,推导出了2本征态的本征值,分析了环境因素波动引起的偏振误差.研究结果表明:采用保偏光纤构建光纤环形腔并旋转熔接点偏振主轴90°能使泵浦光及布里渊激光2本征偏振态在激光器中保持稳定的谐振间距,从而消除偏振串扰给陀螺带来的误差;采用单偏振单模光纤构建布里渊光纤陀螺环形腔能消除偏振串扰.针对2种消除偏振串扰的方法进行了实验,实验结果与理论分析相符.
The polarization transmission model of the pump light and the Brillouin laser in the annular cavity of Brillouin FOG was established and the eigenvalues of the two eigenstates were deduced.The polarization errors caused by the fluctuation of the environmental factors were analyzed.The results show that: Polarization-maintaining fiber to construct optical fiber annular cavity and rotating 90 ° polarization main axis of polarization can make pump laser and Brillouin laser 2 intrinsic polarization state keep stable resonance distance in laser, so as to eliminate the error caused by polarization crosstalk to gyro; Polarization crosstalk can be eliminated by using a single polarization single-mode fiber to create a ring cavity of Brillouin fiber optic gyroscope. Two kinds of methods to eliminate polarization crosstalk have been tested. The experimental results are consistent with the theoretical analysis.