High-efficiency apodized bidirectional grating coupler for perfectly vertical coupling

被引：33

作者：

Zhang, Zanyun ^{[1
,2
]}

Chen, Xia ^{[2
]}

Cheng, Qian ^{[1
]}

Khokhar, Ali Z. ^{[2
]}

Yan, Xingzhao ^{[2
]}

Huang, Beiju ^{[3
]}

Chen, Hongda ^{[3
]}

Liu, Hongwei ^{[1
]}

Li, Hongqiang ^{[1
]}

Thomson, David J. ^{[2
]}

Reed, Graham T. ^{[2
]}

机构：

[1] Tianjin Polytech Univ, Tianjin Key Lab Optoelect Detect Technol & Syst, Tianjin 300387, Peoples R China

[2] Univ Southampton, Optoelect Res Ctr, Southampton SO17 1BJ, Hants, England

[3] Chinese Acad Sci, Inst Semicond, State Key Lab Integrated Optoelect, Beijing 100083, Peoples R China

来源：

OPTICS LETTERS | 2019年 / 44卷 / 20期

基金：

英国工程与自然科学研究理事会; 中国国家自然科学基金; 国家重点研发计划;

关键词：

SILICON; DIRECTIONALITY; INTEGRATION;

D O I：

10.1364/OL.44.005081

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We propose and experimentally demonstrate an apodized bidirectional grating coupler for high-efficiency, perfectly vertical coupling. Through grating apodization, the coupling efficiency (CE) can be notably improved, and the parasitic reflections can be minimized. For ease of fabrication, subwavelength gratings are introduced, which are also beneficial for the coupling performance. Simulation shows a record CE of 72%. We found that the coupler is quite robust to the variation of incidence mode field diameter and fiber misalignment. A CE of -1.8 dB is experimentally measured with a 1-dB bandwidth of 37 nm. (C) 2019 Optical Society of America

引用

页码：5081 / 5084

页数：4