光纤陀螺用集成光收发模块耦合移位对耦合损耗和平均波长的影响研究

Examining the Influence of Coupling Displacement on Coupling Loss and Mean Wavelength in Integrated Optical Transceiver Modules for Fiber Optic Gyroscopes

集成光收发模块作为集成化光纤陀螺的关键器件之一,能够实现光源、探测器和耦合器等功能,其光路的耦合移位会显著影响光路耦合效率和平均波长,从而影响陀螺的零偏和标度因数等性能。文章对空间光路进行理论建模,使用重叠积分法计算耦合效率;使用Beamprop方法进行仿真分析,得到不同耦合位移下的耦合损耗以及平均波长漂移;最后通过对比实验对理论和仿真情况进行了验证。结果表明,耦合损耗受y轴方向耦合移位的影响最大,平均波长漂移受z轴方向耦合移位的影响最大,并给出了不同耦合损耗下的平均波长漂移,为集成光收发模块的光路耦合及优化工作提供参考。

Integrated fiber-optic gyroscopes have considerable application prospects in miniature weapon systems and commercial domains.The integrated optical transceiver module,which is a key component of the integrated fiber-optic gyroscope,incorporates the functionalities of the light source,detector,and coupler.The coupling shift in the optical path can significantly affect the optical coupling efficiency and average wavelength,which in turn affect the zero bias and scale factor of the fiberoptic gyroscope.In this study,theoretical modeling of the spatial optical path is conducted,and the overlap integral method is used to calculate the coupling efficiency.The BeamProp method is utilized for simulation analysis to determine the coupling loss and average wavelength drift under various coupling displacements.Comparative experiments are conducted to verify the theoretical and simulation results.The findings indicate that the coupling shift in the y-direction has the most significant effect on the coupling loss,whereas the z-direction shift has the most substantial influence on the average wavelength drift.Data for the average wavelength drift at different coupling losses are provided,offering guidance for the coupling and optimization of the optical path of the integrated optical transceiver module.