A design method for high fabrication tolerance integrated optical mode multiplexer

被引：6
|
作者：
Shen, Bitao [1 ,2 ]
Shu, Haowen [1 ,2 ]
Zhou, Linjie [3 ]
Wang, Xingjun [1 ,2 ]
机构：
[1] Peking Univ, Sch Elect Engn & Comp Sci, Dept Elect, State Key Lab Adv Opt Commun Syst & Networks, Beijing 100871, Peoples R China
[2] Peking Univ, Minist Educ, Nanooptoelect Frontier Ctr, Beijing 100871, Peoples R China
[3] Shanghai Jiao Tong Univ, Dept Elect Engn, State Key Lab Adv Opt Commun Syst & Networks, Shanghai 200240, Peoples R China
来源：
SCIENCE CHINA-INFORMATION SCIENCES | 2020年 / 63卷 / 06期
基金：
中国国家自然科学基金;
关键词：
mode multiplexer; directional coupler; taper structure; coupled-mode theory; genetic algorithm; SILICON MODE; EFFICIENT;
D O I：
10.1007/s11432-020-2888-2
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
The tapered asymmetric directional coupler has the potential to realize high fabrication tolerance and high transmission efficiency on-chip mode multiplexer. However, the geometry parameter selection of tapered structure remains empirical. In this paper, we propose a design method for the tapered structure based on genetic algorithm. Combined with the adjusted coupling equations and interpolation method, lowtime- cost optimization can be realized. Three mode multiplexers (TE0&TE1, TE0&TE2 and TE0&TE5) are designed by our method. According to simulation results, the insertion loss of the designed devices is lower than 1.8 dB and the crosstalk is lower than -15 dB when the fabrication error is within required range (+/- 10 nm for TE0&TE2 and TE0&TE5, and +/- 20 nm for TE0&TE1) in the bandwidth of 1.5-1.6 mu m. In addition, the entire optimization process takes only 2 h for each device, which is around the time cost of a single 3D simulation.
引用
收藏
页数：11
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