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在分析比较双折射晶体偏振光干涉型和平面波导环形格子结构型光交错复用滤波器原理的基础上 ,揭示了两者在光谱透射率的数学上的等效性 ,给出了两者结构参量之间的等效关系 ,可以直接利用经简单傅里叶级数对比法获得的晶体的结构参量对平面波导环形格子结构型光交错复用滤波器进行结构设计。利用该方法对一个两级平面波导环形格子结构型光交错复用滤波器进行了优化设计 ,信道隔离度比文献中结构提高了近 5dB ,而且结构参量有多种组合。与利用复杂的格子理论计算仅获得一组结构参量相比 ,该方法更加简单、有效。
Based on the comparison and analysis of the principle of the birefringent crystal polarization interferometer and the planar waveguide ring lattice structure optical interleaver, the mathematic equivalence between the two in spectral transmittance is revealed. Equivalent relationship between the parameters can be directly used by the simple Fourier series of the crystal structure parameters obtained by the planar waveguide ring grating structure type optical interleaved filter structure design. By using this method, a two-stage planar waveguide circular lattice structure optical interleaver is optimized. The channel isolation is improved by nearly 5dB compared with that in the literature, and the structure parameters have many combinations. Compared with using complex lattice theory to obtain only one set of structural parameters, this method is simple and effective.