基于光子晶体光纤Sagnac环梳状滤波器的设计

Design of comb filter based on photonic crystal fiber Sagnac loop

提出了由两段高双折射光子晶体光纤构成的Sagnac环滤波器,利用Jones矩阵理论对所提出的Sagnac环滤波器的传输函数进行了理论推导,并分析了光子晶体光纤双折射大小、两段光子晶体光纤的长度,以及偏振控制器的偏转角度对滤波器透射光谱特性的影响,并以此为基础设计出平顶梳状交错滤波器。此类滤波器在密集波分复用系统中有着广阔的应用前景。

A novel all- fiber comb filter is proposed based on Sagnac loop intefferometer of photonic crystal fiber （PCF）. The transmission function of the proposed Sagnac loop filter is expressed theoretically by Jones trasmit - matrix. The influences of birefringence of PCF, the lengths of two sections of PCF and the rotatable angle of polarization controllers on its output spectra are numerically studied. On the basis of this result, a wavelength switchable comb filter with flat - top spectral response is realized. This kind of filter can be expected to be used widely in DWDM systems in the future.