摘要
声光可调谐滤波器的设计关键是它的各个模块,包括光波导、模分离器、声波导和叉指换能器的参数设计。采用BPM方法计算了模分离器中对称模和非对称模的相位差,得到了TE模具有100%的转换率,而TM模的转换率为0时所对应的中央耦合部分长度Lc和分叉角θ之间的关系曲线。从该曲线可以得到同时满足TE模叉通和TM模直通条件的Lc和θ。最后,再次利用BPM这一工具,对所设计的模分离器进行了性能分析。
The modules of optical waveguide,surface acoustic waveguide and mode splitter,and the parameter design of interdigital transducer are most important in the design of acousto-optical tunable filter（AOTF）.The phase difference between symmetrical mode and asymmetric mode in the mode-splitter was calculated with BPM method.The design results that TE mode has 100% conversion efficiency,and the relation curve of coupling length and forficate angle（while the conversion efficiency of TM mode is zero） were obtained.From the curve,and which satisfy the condition of TE mode and TM mode simultaniously can be obtained.The performance analysis of the mode-splitter designed in this way was carried out by the aid of BPM.
出处
《现代电子技术》
2012年第10期112-114,共3页
Modern Electronics Technique
基金
杭州科技职业技术学院课题(KZYYB-2010-9)
