High-performance ultra-compact polarization splitterrotators based on dual-etching and tapered asymmetrical directional coupler  

作　　者：Changjian Xie Xihua Zou Fang Zou Yong Zhang 解长健;邹喜华;邹放;张永(Center for Information Photonics and Communications,School of Information Science and Technology,Southwest Jiaotong University,Chengdu 611756,China;State Key Laboratory of Advanced Optical Communication Systems and Networks,Department of Electronic Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]Center for Information Photonics and Communications,School of Information Science and Technology,Southwest Jiaotong University,Chengdu 611756,China [2]State Key Laboratory of Advanced Optical Communication Systems and Networks,Department of Electronic Engineering,Shanghai Jiao Tong University,Shanghai 200240,China

出　　处：《Chinese Optics Letters》2021年第12期21-25,共5页中国光学快报（英文版）

基　　金：supported by the National Key Research and Development Program of China(No.2019YFB2203600)。

摘　　要：High-performance ultra-compact polarization splitter-rotators(PSRs)are designed and experimentally demonstrated,using dual etching and a tapered asymmetrical directional coupler.First,two novel PSRs are designed with nanowire and subwavelength grating cross-port waveguides and verified in simulations.Then,one of the two PSRs is fabricated.Experiment results reveal that the extinction ratio is higher than 28 dB or 32 dB at 1550 nm for the launched fundamental transverse magnetic or the transverse electric modes,while the corresponding insertion loss and polarization conversion loss are 0.33 dB and 0.18 dB,respectively.

关 键 词：polarization splitter and rotator silicon photonics asymmetrical directional coupler dual etching 

分 类 号：TN256[电子电信—物理电子学]