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本文提出了一种 1550nm 波长的二维正方晶格光子晶体三模式模分复用/解复用器。该器件由两个非对称定向耦合结构组成，可以实现 TE0、TE1和 TE2模式的模分复用与解复用。同时为了防止波导耦合处的模式失配问题，本文在波导耦合处采用了渐变结构。利用时域有限差分法(FDTD)和平面波展开法(PWM）对其性能进行分析，结果表明：该器件在1550nm 波长TE0、TE1和TE2模式的模分复用/解复用的插入损耗低于0.14d B，信道串扰低于-20d B。
This paper presents a 1550nm wavelength two-dimensional square lattice photonic crystal three mode D / M. The device consists of two asymmetric directional coupling structure, can be achieved TE0, TE1 and TE2 mode division multiplexing and demultiplexing. In the meantime, in order to prevent the mode mismatch problem at the waveguide coupling, a gradient structure is adopted in the waveguide coupling. The performance of the device is analyzed by the finite difference time domain (FDTD) and the plane wave expansion (PWM) method. The results show that the insertion loss of the device in the mode-division multiplexing / demultiplexing of TE0, TE1 and TE2 at 1550nm is lower than 0.14d B, channel crosstalk less than -20d B.