偏振无关的电光多波长滤波器设计

偏振无关的电光多波长滤波器设计

内容简介：基双折射铌酸锂(LiNbO3)晶体的电光效应,设计了一种偏振无关的二端口波导型多波长可调谐滤波器.在非对称干涉仪的上下分支波导上,耦合电极与相移电极周期性交叉级联实现模式的偏振转换.利用琼斯矩阵的Z分析,求解驱动电压模拟实现多个波长的同时选择.仿真实现了自由光谱范围(FSR)内分布任意的窄带多波长输出.波长中心处传输率为100%;旁瓣大小受到所选波长个数的影响,三个波长同时滤波的旁瓣可达12 dB.同时得到了梳状滤波输出谱,其通带顶部平坦,旁瓣可达20 dB以上.

Abstract：In order to increase the flexibility of optical signal demultiplex, a polarization-independent two-port multi-wavelength tunable filter was designed based on the electro-optic effect of birefringent lithium niobate (LiNbO3) crystal. On each arm of an asymmetric interferometer, mode-coupled electrode and phase-shifted electrode periodically alternated cascaded were set to realize mode conversion. Z-transform was utilized in analysis of Jones matrix to get the values of needed driving voltages to select wavelengths simultaneously. Narrow-band multi-wavelength with arbitrary distribution was simulated successfully in free spectrum range (FSR). 100% transmittance was obtained at each wavelength. The number of wavlengths had an influence on sidelobe of each wavelength. And sidelobe of 12 dB could be realized when three wavelengths were selected. Interleaver could also be obtained using this method, which had a flat passband and sidelobe of more than 20 dB.

作者：刘群,

关键词：光电器件, 偏振无关, 多波长滤波, 在域变换