Wang Xiaofei, Yu Hui, Zhang Qiang, Fu Zhilei, Xia Penghui, Huang Qikai, Ning Nannan, Wei Zhujun, Wang Yuehai, Jiang Xiaoqing, Yang Jianyi
Opt Lett. 2022 May 1;47(9):2198-2201. doi: 10.1364/OL.449493.
Asymmetrical directional couplers aided with subwavelength sidewall corrugations are used to realize ultra-compact silicon mode (de)multiplexers at C-band. Three mode (de)multiplexers with ultra-short coupling lengths of 5.6/6.5/7.7 m are designed to enable low-loss mode conversions between TE and TE modes. They are then cascaded to build a four-channel mode-division-multiplexing (MDM) link. The four mode channels present minimal on-chip insertion losses of 0.2/0.7/0.7/0.9 dB at their peak wavelengths. Measured cross talk levels of the four mode channels are better than -18.0/-19.1/-16.0/-18.2 dB within the wavelength range from 1530 nm to 1580 nm.
带有亚波长侧壁波纹的非对称定向耦合器被用于在C波段实现超紧凑硅模式复用/解复用器。设计了三种具有5.6/6.5/7.7μm超短耦合长度的模式复用/解复用器，以实现TE和TE模式之间的低损耗模式转换。然后将它们级联以构建一个四通道模式分割复用（MDM）链路。这四个模式通道在其峰值波长处的片上插入损耗最小，分别为0.2/0.7/0.7/0.9dB。在1530nm至1580nm的波长范围内，四个模式通道的测量串扰水平优于-18.0/-19.1/-16.0/-18.2dB。
