基于谐振耦合现象的三芯光子晶体光纤带通滤波器  

Bandpass filter based on resonant tunneling phenomenon in three-core photonic crystal fibers

作　　者：余学权[1] 刘明礼[1] 汪昊[1] 陈伟[1] 

机构地区：[1]江苏大学机械工程学院光信息科学与技术系,江苏镇江212013

出　　处：《应用光学》2010年第2期305-308,共4页Journal of Applied Optics

摘　　要：设计了一种三芯光子晶体光纤带通滤波器结构。利用纤芯间的谐振耦合,实现了滤波。当3个纤芯基模模式有效折射率在同一频率点实现匹配时,将产生谐振现象。通过合理选取光纤结构参数,可以使3个模式满足谐振条件。由于3个纤芯基模只在工作波长处实现有效折射率的匹配,因而纤芯间发生波长的选择性耦合。应用全矢量光束传播法(BPM)分析了这种光纤带通滤波器的性能。结果表明:在1.55μm工作波长上,光纤耦合长度为22.8 mm;在损耗低于-3 dB前提下,通带带宽为8.9 nm。A bandpass filter based on resonant tunneling phenomenon in three-core photonic crystal fibers （PCFs） is presented. Resonance will occur if the effective refractive indices of the fundamental modes of three-core PCFs match at the same wavelength. By choosing the proper parameters of PCFs, all the three modes could meet the resonant condition. The effective refractive indices of the three-cores match only at the wavelength of 1. 55 um. As a result, wavelength-selective coupling is achieved. Full-vector beam propagation method （BPM） is employed to analyze the performance of the filter. Numerical investigation demonstrates that the coupling length is 22. 8 mm, and the bandwidth of the bandpass filter is 8. 9 nm with the loss of -3 dB at 1.55 um.

关 键 词：三芯光子晶体光纤 滤波器 光束传播法 窄带 

分 类 号：TN252[电子电信—物理电子学]