Polarization-insensitive ultra-short waveguide taper

作者：Jingjing Zhang, Xiaodong Shi, Zhaojian Zhang, Chao Ma, Xuefeng Chen, Liping Liu, Xiaoxian Song, Haiting Zhang, Yu Yu, Haiyan Ou, Kai Guo, Junbo Yang · 发表于：Optics Letters · 年份：2021 · DOI：10.1364/ol.436223 · 被引用次数：11 · 研究领域：Photonic and Optical Devices、Optical Network Technologies、Microwave Engineering and Waveguides

Waveguide taper, a key component in the photonic integrated circuit (PIC), enables on-chip mode conversion, but large-footprint tapers are detrimental to the PIC, which desires compact and efficient devices. Polarization sensitivity also limits the tapers in the applications involving orthogonal modes. In this work, we design an efficient polarization-insensitive ultra-short MMI-based waveguide taper, through the mode spreading principle and the self-image principle. The proposed taper is 26.3 µm long, one order of magnitude shorter than the standard linear taper. We fabricate the taper, and experimentally demonstrate that it exhibits a high transmission efficiency of ∼ 70 % and a wide 1 dB bandwidth of > 54 n m , for both TE and TM polarizations.