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根据磁光材料的非互易特性和波导光栅的滤波特性,介绍了一种磁光波导光栅的非互易滤波特性及其应用。该磁光波导光栅采用法拉第旋转系数为4800°/cm的掺铈钇铁石榴石(Ce∶YIG)材料、单模的脊型补偿墙截面结构和cosine型变迹光栅结构的设计。利用有限差分法和等效折射率法模拟该磁光波导光栅非互易效应的大小,同时结合耦合模理论和转移矩阵法对该磁光波导光栅的非互易滤波特性进行分析。结果表明,对于TE模和1550 nm波段,该磁光波导光栅正反向传输的中心波长偏移0.8 nm,带宽0.4 nm(-20 dB)。这种非互易滤波特性可以用来实现波长选择光隔离器和光分插复用器(OADM)等集成光学器件。
According to the nonreciprocal characteristics of magneto-optical materials and the filtering characteristics of waveguide grating, a non-reciprocal filtering characteristic of a magneto-optical waveguide grating and its application are introduced. The magneto-optic waveguide grating is designed with a cerium-doped yttrium iron garnet (Ce: YIG) material with a Faraday rotation coefficient of 4800 ° / cm, a single-mode ridge compensation wall cross-section structure and a cosine-type apodized grating structure. The non-reciprocal effect of the magneto-optical waveguide grating is modeled by the finite difference method and the equivalent refractive index method, and the non-reciprocal filter characteristics of the magneto-optical waveguide grating are analyzed based on the coupled-mode theory and the transfer matrix method. The results show that for the TE mode and the 1550 nm band, the center wavelength of forward and backward transmission of the magneto-optical waveguide grating is shifted by 0.8 nm and the bandwidth is 0.4 nm (-20 dB). This non-reciprocal filtering feature can be used to implement integrated optics such as wavelength selective optoisolators and optical add / drop multiplexers (OADMs).