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为了解决单个均匀光纤光栅Sagnac环信道隔离度差的缺点,提出了级联Sagnac环组成梳状滤波器的方案。采用Jones矩阵理论分别对单个光纤光栅Sagnac环和二阶、三阶级联时的频谱特性进行了理论分析和数值仿真。对于三阶Sagnac环级联时的情形,实现了通道间隔为0.8 nm、FWHM为0.1 nm的梳状滤波器,在相同信道间隔下使得FWHM降低为单个光纤光栅Sagnac环的1/4,从而有效提高了系统信道隔离度。得到了具有均匀通带间隔、信道隔离度高、光谱半高宽度FWHM窄等特性的梳状滤波器,使其性能能够更好地满足WDM的使用要求。
In order to solve the shortcomings of poor channel isolation of single uniform FBG Sagnac ring, a comb-like Sagnac loop comb filter is proposed. The Jones matrix theory is applied to the theoretical analysis and numerical simulation of the single-fiber grating Sagnac rings and the second-order and third-order cascades respectively. For cascaded third-order Sagnac rings, a comb filter with a channel spacing of 0.8 nm and a FWHM of 0.1 nm is achieved, reducing the FWHM to ¼ of a single FBG Sagnac loop at the same channel spacing to be effective Improve the system channel isolation. A comb filter with uniform passband spacing, high channel isolation and narrow FWHM of half-width of the spectrum is obtained, which can better meet the requirements of WDM.