Two-Dimensional Apodized Grating Coupler for Polarization-Independent and Surface-Normal Optical Coupling

被引：20

作者：

Zhang, Zanyun ^{[1
]}

Chen, Xia ^{[2
]}

Cheng, Qian ^{[1
]}

Khokhar, Ali Z. ^{[2
]}

Zhang, Zan ^{[4
]}

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] Tiangong 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

[4] Changan Univ, Sch Elect & Control Engn, Xian 710064, Peoples R China

来源：

JOURNAL OF LIGHTWAVE TECHNOLOGY | 2020年 / 38卷 / 15期

基金：

英国工程与自然科学研究理事会; 国家重点研发计划; 中国国家自然科学基金;

关键词：

Apodized grating coupler; polarization independent; surface-normal; 2-D grating coupler; DEPENDENT-LOSS; FIBER; SOI;

D O I：

10.1109/JLT.2020.2986043

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A four-port grating coupler with etched square holes is proposed and demonstrated for surface-normal and polarization independent coupling. Benefiting from the perfectly vertical coupling and 1x4 power splitting/combing scheme, efficient polarization independent operation was achieved. The coupling efficiency was further improved by grating apodization. According to the simulations, the proposed 2D apodized grating coupler can achieve a coupling efficiency (CE) of 64.5% (-1.9 dB), a low upward back-reflection of 8.5% (-11 dB), and polarization-dependent loss (PDL) lower than 0.04 dB across the wave length range of 1520-1620 nm. A CE of 56.3% (-2.5 dB) was experimentally measured, with PDL below 0.3 dB within the C-band and lower than 0.5 dB within the L-band. Waveguide delay lines were used to compensate the waveguide channel phase differences at the output port.

引用

页码：4037 / 4044

页数：8