针对现有模式复用器的不足,根据有效折射率匹配效应,设计一种非对称平面光波导型模式复用/解复用器。波导结构由1个波导主臂和2个波导分支臂组成。研究了波导各项参数的确定准则,仿真分析了不同的波导底面宽度比对模式复用/解复用性能的影响,确定了最佳的波导底面宽度比,分析了基模和一阶模在波导中的传输过程和光场能量流动情况。结果表明:非对称平面光波导型模式复用/解复用器具有良好的模式复用和解复用性能,并且可以高效率地实现模式之间的转换,具有结构简单、模式转换效率较高、易于集成等优点。 Aiming at the deficiency of the existing mode multiplexer, an asymmetric planar optical waveguide mode multiplexer / demultiplexer is designed according to the effective refractive index matching effect. The waveguide structure consists of a waveguide main arm and two waveguide branch arms. The criteria for the determination of waveguide parameters are studied. The effects of different waveguide bottom width ratios on the mode multiplexing / demultiplexing performance are analyzed. The best waveguide bottom width ratio is determined. The fundamental modes and the first order modes Waveguide transmission and optical field energy flow. The results show that the asymmetric planar optical waveguide mode multiplexer / demultiplexer has good performance of mode multiplexing and demultiplexing, and can realize the conversion between modes with high efficiency. The invention has the advantages of simple structure, high mode conversion efficiency, Easy to integrate and so on.