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基于双折射铌酸锂(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域分析,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。
Based on the electro-optic effect of birefringent lithium niobate (LiNbO3) crystals, a polarization independent two-port waveguide multi-wavelength tunable filter was designed. In the asymmetric interferometer up and down branch waveguide, the coupling electrode and the phase shift electrode periodically cross-cascade to achieve the mode of polarization conversion. Z-domain analysis of the Jones matrix is used to solve the driving voltage simulation to achieve simultaneous selection of multiple wavelengths. The simulation enables arbitrary narrow-band multi-wavelength output to be distributed in the free spectral range (FSR). The transmission rate at the center of the wavelength is 100%; the size of the side lobe is affected by the number of selected wavelengths and the sidelobes of the three wavelengths are filtered simultaneously up to 12 dB. At the same time, the comb filter output spectrum is obtained. The top of the passband is flat and the side lobe can reach more than 20 dB.