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基于模式耦合理论,研究了一种3个模式的锥形光纤模式复用/解复用器,可以实现1根少模光纤与3根单模光纤之间的模式复用及解复用,有利于提升光纤传输系统的传输容量。当基模光场分别输入3根直径为10、8.4、7.2μm的单模光纤时,会在锥形结构中发生耦合并转换为高阶模式场。利用重叠积分计算该复用器输出端口光场与标准模式场的相似度,检测出输入的基模在输出端分别转换为LP_(01)和两个简并的LP_(11)模式,即实现模式复用。当LP_(01)和两个LP_(11)模式分别输入到少模光纤时,从解复用器输出端相应端口输出的光功率最大,即实现模式解复用。最后改变复用器的结构参数来计算该器件的容差比,计算出该器件实现模式转换以及解复用效果最好的拉锥长度分别为3.88cm和3.8931cm。
Based on the theory of mode coupling, a 3-mode tapered fiber mode multiplexer / demultiplexer is studied, which can realize the mode multiplexing and demultiplexing between 1 mode-less fiber and 3 single-mode optical fibers. There are Which will help to improve the transmission capacity of optical fiber transmission system. When three fundamental mode optical fields are input into three single-mode optical fibers with diameters of 10, 8.4 and 7.2μm respectively, they will couple into the tapered structure and transform into high-order mode fields. The overlapping integral is used to calculate the similarity between the optical field at the output port of the multiplexer and the standard mode field. It is detected that the input fundamental mode is converted to LP_ (01) and two degenerate LP_ (11) modes respectively at the output end, that is, Mode reuse. When LP_ (01) and two LP_ (11) modes are input to the MMF respectively, the optical power output from the corresponding port at the output end of the demultiplexer is the maximum, ie, the mode demultiplexing is realized. Finally, the structure parameters of the multiplexer were changed to calculate the device’s tolerance ratio. The best taper length of the device for mode conversion and demultiplexing was calculated to be 3.88cm and 3.8931cm respectively.