逐渐变细
模式(计算机接口)
绝热过程
光学
选择性
多路复用
芯(光纤)
材料科学
光束传播法
作者
Li Shen,Lin Gan,Liang Huo,Chen Yang,Weijun Tong,Songnian Fu,Ming Tang,Deming Liu
出处
期刊:Applied Optics
[The Optical Society]
日期:2018-08-20
卷期号:57 (24): 7065-7065
被引量:6
摘要
Highly mode group selective photonic lanterns (PLs) are desired for mode-division multiplexing transmission systems. Usually, mode selectivity is achieved by using input fibers with different core diameters or refractive indices to break degeneracy between mode groups. We demonstrate that mode group selectivity can be greatly improved by optimizing core geometry of PLs. For three-mode PLs with optimized core geometry, based on beam propagation method (BPM) simulation results, mode selectivity is improved from 23.8 dB to 43.9 dB for LP01 mode, and mode selectivity of LP11 mode is improved from 26.8 dB to 45.5 dB. The reason is the optimized core geometry can significantly slow down the changing of mode profile along the taper of the PL; thus adiabatic tapering requirement can be greatly alleviated. It can also be observed that the simulation results by the BPM are in good agreement with calculation of coupled-mode theory.
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