基于正三角型三芯光纤的波分解复用器

Wavelength-Division Demultiplexer Based on Equilateral Three-Core Fiber

设计了基于正三角排列三芯光纤的新型波分解复用器,比起基于多芯光子晶体光纤的波分解复用器,该波分解复用器有着容易制作、且易于与常规光纤对接的优点。通过设计使两个非对称平行纤芯在某波长处的传播常数(或有效折射率)匹配,此时两个纤芯就可完全耦合,从而实现滤波。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纤芯端口输出,从而实现波分解复用的功能。利用全矢量光束传播法仿真发现,长度为10.25 mm的正三角排列三芯光纤可以实现波长为1.31μm和1.55μm光波的解复用。

A novel wavelength-division demultiplexer based on equilateral three-core optical fiber is proposed. Compared to the wavelength-division demultiplexer based on photonic crystal fiber, it has the advantage of being easier to make and to link with conventional optical fiber. Two parallel mismatched cores are designed to be phase-matched （or index-matched） at certain wavelength. Then the light in the two cores will be fully coupled, which will lead to filtering. By selecting a suitable fiber length, different wavelengths of the input light can be output at different cores end of the optical fiber to achieve the function of wavelength- division demultiplexer. Numerical simulation by beam propagation method demonstrates that a 10.25 mm long wavelength-division demultiplexer based on equilateral triangle arrangement three-core optical fiber can separate 1.31 I-~m wavelength light from 1.55μm wavelength light.