法拉第磁光波导的耦合模分析

The Coupling Mode Analysis of Faraday Magnetooptic Waveguides

利用法拉第磁光效应可以设计光纤磁场传感器。在磁场传感过程中 ,磁光晶体薄膜波导的TE模和TM模式之间将发生转换 ,其转换效率与磁光晶体的法拉第旋转角度和双折射有关。本文建立了磁光波导的耦合模方程 ,分析了磁光波导中的TE TM模转换 ,提出了通过减小线性双折射和增大法拉第旋转角来提高TE TM模耦合效率的措施 。

Fiber magnetic field sensor may be achieved by using Faraday magneto optic effect. The energy is exchanged between TE mode and TM mode in film waveguide, the exchange efficiency relates to the Faraday rotate angle and birefringence of the crystal. In this paper, the coupling mode equations are established, the exchange between TE mode and TM mode of film waveguide is analyzed, the methods of improving exchange efficiency are provided, the output power of TM mode and sensitivity of magnetic field sensor can be enhanced by these steps.