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为了获得对温度变化不敏感和信道隔离度好的光滤波器,提出了一种基于高双折射光子晶体光纤的Sagnac环级联滤波器。运用Jones矩阵理论对二阶级联Sagnac环滤波器进行了理论分析和数值仿真,可得级联滤波器中两段高双折射光子晶体光纤长度之比为2:1时,透射谱的半峰全宽为0.4 nm,仅为单个Sagnac环滤波器的1/3,有效提高了滤波器的信道隔离度。结果表明,该级联滤波器有着良好的滤波效果,且对温度变化不敏感,可应用于50 GHz的密集波分复用系统。
In order to obtain an optical filter insensitive to temperature changes and good channel isolation, a Sagnac loop cascaded filter based on a high birefringence photonic crystal fiber is proposed. The theory and numerical simulation of the second-order cascaded Sagnac ring filter based on the Jones matrix theory show that when the ratio of the lengths of the two high-birefringence photonic crystal fibers in the cascaded filter is 2: 1, the half- 0.4 nm wide, only 1/3 of a single Sagnac loop filter, effectively increases the channel isolation of the filter. The results show that the cascaded filter has a good filtering effect and is insensitive to temperature changes and can be applied to a 50 GHz Dense Wavelength Division Multiplexing system.