基于混合导光型光子晶体光纤的波分解复用器研究  

A Novel Wavelength-Division Demultiplexer Based on Hybrid Photonic Crystal Fibers

作　　者：文科[1] 王荣[1] 汪井源[1] 李建华[1] 

机构地区：[1]解放军理工大学通信工程学院,江苏南京210007

出　　处：《光学学报》2009年第4期1088-1091,共4页Acta Optica Sinica

基　　金：江苏省自然科学基金(BK2008089)资助课题

摘　　要：设计了一种基于混合导光型光子晶体光纤的波分解复用器,该波分解复用器同时具有折射率导光型光子晶体光纤和带隙导光型光子晶体光纤的特点,可用于稀疏型波分复用系统中。设计的稀疏型波分解复用器由一段三芯光子晶体光纤组成,通过填充不同折射率的材料,形成了混合导光型光子晶体光纤。根据耦合模原理,在临近的波导中,当传播常数相等时,模式之间发生强烈耦合,能量在波导之间交替。由于填充的材料折射率不同,使得光功率在两个不同的波长上发生耦合,构成了两个不同响应波长的光滤波器。通过选择合适的光纤长度,使得在光纤的输出端,不同波长的光从不同的波导输出,实现波分解复用的功能。采用全矢量有限元法分析了光纤传输特性,计算了不同波长光的耦合长度。采用光束传播法仿真发现,长度为4.3 mm的光纤能实现波长为1.31 μm和1.55 μm光的解复用。A novel wavelength-division demultiplexer which is based on photonic crystal fibers （PCFs） with hybrid light-guiding mechanism has been proposed. Different from the traditional PCFs, hybrid light-guiding PCFs share the properties of both the index-guiding PCFs and the bandgap-guiding PCFs. The proposed wavelength-division demultiplexer can be used in the coarse wavelength-division multiplexing system. The proposed wavelength-division demultiplexer consists of three cores. High-index materials are filled into the circle of air holes around the three cores. Because the material＇s indices are different, the PCF operates by a hybrid light-guiding mechanism. According to the coupled-mode theory, the coupling happens when the propagation constants of two adjacent cores are equal at a particular wavelength λ0. There are two corresponding wavelengths, so two beams of light with different wavelengths can put out in different cores if choosing the appropriate parameters of PCFs. By full-vectorial finite element method （FEM）, the properties of PCF are be analyzed and the coupling lengths for different-wavelength lights were calculated. Numerical simulations by beam propagation method demonstrate that it is possible to obtain a 4.3 mm-long wavelength-division demultiplexer which can separate two lights with wavelength 1. 31 μm and 1.55 μm, respectively.

关 键 词：光纤光学 波分复用 有限元法 光束传播法 

分 类 号：TN253[电子电信—物理电子学]