摘要
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。
A kind of three modes tapered fiber mode multiplexer/demultiplexer is developed based on mode coupling theory for realizing modes multiplexing and demultiplexing between a few-mode fiber （FMFs） and three single-mode fibers （SMFs）. It is significant to improve the transmission capacity of optical transmission system. When the fundamental mode lights are input into three SMFs with the diameters of 10μm, 8.4 μm and 7.2μm, the lights will couple in the tapered area and convert into higher order modes. The similarity between optical field at output port and standard mode field is further calculated by overlap integral. As a consequence, the fundamental modes can be converted into LP01 mode and two degenerate LP11 modes at the output port, i.e. realization of modes multiplexing. When the LP01 mode and two LP11 modes are separately input into the FMF, the output light power of corresponding port is the maximum, i.e. realization of modes demultiplexing. Finally, the multiplexer＇s tolerance is calculated with different parameters. Calculation results show that 3.88 cm and 3. 8931 cm are the tapered structure＇s length of the multiplexer for best effect of mode converting and demultiplexing.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2016年第6期185-190,共6页
Chinese Journal of Lasers
基金
国家自然科学基金(61571035)
关键词
光纤通信
模式复用
模式转换
解复用
模式鉴别
optical communications
mode multiplexing
mode conversion
demultiplexing
mode identification
