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本文提出的基于长周期光纤光栅 (L PFG)的全光纤宽阻带滤波器的制做方法 ,基本原理是在光纤纤芯中引入周期性的非对称形变 ,从而使光纤纤芯的折射率发生周期性变化 ;提出了两种实现光纤纤芯非对称形变的方法 ,进而制做出阻带中心波长分别为 1310 nm和 15 5 0 nm的全光纤宽阻带滤波器插入损耗分别小于 0 .8d B和 1.4 d B,后向反射损耗小于 - 70 d B。这样的器件可用于提高 WDM系统的隔离度
In this paper, the fabrication method of all-fiber wide-band stopband filter based on long period fiber grating (L PFG) is proposed in this paper. The basic principle is to introduce periodic asymmetrical deformation into the fiber core so that the refractive index of the fiber core Periodic changes are proposed. Two methods to realize the asymmetric deformation of the fiber core are proposed. Then the insertion loss of the all-fiber wide-band stop-band filter with the stopband center wavelengths of 1310 nm and 1550 nm is respectively less than 0.8 d B and 1.4 d B, the retroreflective loss is less than -70 d B. Such a device can be used to improve the isolation of a WDM system