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光纤陀螺光路结构中,Y波导器件与保偏光纤环通过尾纤熔接的方式连接形成闭合回路来敏感系统相对惯性空间的转动信息,而熔接点引入的偏振交叉耦合以及背向反射是制约光纤陀螺测量精度进一步提高的主要因素。为此,提出了一种实现保偏光纤环与Y波导芯片直接耦合的方法,并制作了两者直接耦合的敏感环光路。经实验测试,光路中Y波导器件的插入损耗典型值为2.7dB,分光比优于48/52~52/48,偏振串音优于-30dB,性能指标与常规的Y波导器件相当。该光路模块理论上有利于减小光纤陀螺系统噪声和提高测量精度。
In the optical fiber gyroscope optical path structure, the Y waveguide and the polarization-maintaining optical fiber loop are connected by pigtail fusion to form a closed loop to sense the rotation information of the relative inertial space of the system. The polarization cross-coupling and back-reflection introduced by the fusion splice are constraints on the optical fiber gyroscope Measurement accuracy to further improve the main factors. Therefore, a method to realize the direct coupling between the polarization maintaining fiber ring and the Y waveguide chip is proposed, and a direct-coupling sensitive ring optical path between the two is proposed. The experimental results show that the insertion loss of the Y waveguide in the optical path is 2.7dB, the spectral ratio is better than 48/52 ~ 52/48 and the polarization crosstalk is better than -30dB. The performance index is comparable to that of the conventional Y waveguide. The optical path module is theoretically beneficial to reduce the noise and improve the measurement accuracy of the optical fiber gyroscope system.