Opt Lett. 2018 Sep 1;43(17):4176-4179. doi: 10.1364/OL.43.004176.
A compact hybrid wavelength- (WDM) and mode-division (de)multiplexer (MDM) is proposed, and its performance is evaluated. The design of the device is based on 2D photonic crystals with a square lattice and Si rods. The device can multiplex two eigenmodes, TM and TM, and two wavelengths, 1550 and 1300 nm. Two identical multimode interference couplers and an asymmetric directional coupler are used in implementing both the wavelength- and mode-division multiplexing functions, respectively. To avoid back-reflections, tapers are used at waveguide junctions. The structure is compact with dimensions of 29 μm×12 μm, which is suitable for on-chip integration. Simulation results reveal that the insertion losses and crosstalks are less than -1.0927 and -11.9024 dB, respectively, for all four channels.
提出并评价了一种紧凑的混合波分（WDM）和模式分（de）复用器（MDM）。该器件的设计基于具有正方形晶格和 Si 棒的二维光子晶体。该器件可以复用两个本征模式 TM 和 TM，以及两个波长 1550nm 和 1300nm。两个相同的多模干涉耦合器和一个非对称定向耦合器分别用于实现波长和模式的复用功能。为了避免反射，在波导连接处使用了锥形结构。该结构紧凑，尺寸为 29μm×12μm，适用于芯片集成。模拟结果表明，对于所有四个通道，插入损耗和串扰均小于-1.0927dB 和-11.9024dB。
