光纤线性偏振模式组合对模分复用系统的影响研究

Research on the Influence of Fiber Linear Polarized Mode Combination on Mode Division Multiplexing System

在纤芯直径为50μm的多模光纤中研究了7个光纤线性偏振(LP)模式的6种四模式组合对模分复用系统的影响。这7个LP模式由已报道的3个低阶模式(LP_(01)、LP_(11)、LP_(21))和4个传播常数(β)相差较大的模式(LP_(02)、LP_(12)、LP_(13)、LP_(14))组成,根据模式光斑形状及耦合特性选择6种不同的四模式组合并在Optisystem平台进行仿真。结果表明,在进行模分复用短距离传输时,选择LP_(01)、LP_(11b)、LP_(12a)以及LP_(21b)的模式组合,其Q因子最高,眼图效果最好,即该模式组合传输效果最佳。

A research has been carried out on the influence of six four-mode combinations of sevenfiber linear-polarization(LP)modes on the mode division multiplexing system in the multi-modefiber with a core diameter of 50μm.The seven-LP modes are composed of three reported low-order modes(LP_(01)、LP_(11)、LP_(21))and four modes(LP_(02)、LP_(12)、LP_(13)、LP_(14))with significant differences in propagation constants(β).Six different four-mode combinations are selected according to the pattern spot shape and mode coupling characteristics,followed by a simulation test on the Optisystem platform.The results show that with short distance transmission performed in modular division multiplexing,the mode combination o fLP_(01)、LP_(11b) , LP_(12a) and LP_(21b) is characterized with the highest Q factor and the optimal eye diagram effect,indicating that this mode combination achieves the best transmission effect.