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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 wavelength division multiplexer based on a mixed light guide photonic crystal fiber is designed. The wavelength division demultiplexer also has the characteristics of a refractive index light guide photonic crystal fiber and a band gap light guide photonic crystal fiber, which can be used for sparse WDM system. The designed Sparse Wavelet Demultiplexer consists of a section of three-core photonic crystal fiber. By filling the material with different refractive index, a mixed light guide photonic crystal fiber is formed. According to the coupled mode principle, in the adjacent waveguides, when the propagation constants are equal, strong coupling occurs between the modes, and the energy alternates between the waveguides. Due to the different refractive indices of the filled materials, the optical power is coupled at two different wavelengths to form two optical filters with different response wavelengths. By selecting an appropriate fiber length, the light of different wavelengths is output from different waveguides at the output end of the fiber to realize the function of wave division multiplexing. The full-fiber finite element method is used to analyze the optical fiber transmission characteristics, and the coupling lengths of different wavelengths of light are calculated. Using beam propagation simulation, it was found that a 4.3 mm fiber length enables demultiplexing of wavelengths of 1.31 μm and 1.55 μm.