Proposal for diminishment of the polarization-dependency in a Si-nanowire multimode interference (MMI) coupler by tapering the MMI section

被引：18

作者：

Dai, Daoxin ^{[1
]}

He, Sailing

机构：

[1] Zhejiang Univ, State Key Lab Modern Opt Instrumentat, Ctr Opt & Electromagnet Res, Hangzhou 310027, Zhejiang, Peoples R China

来源：

IEEE PHOTONICS TECHNOLOGY LETTERS | 2008年 / 20卷 / 5-8期

基金：

中国国家自然科学基金;

关键词：

multimode interference (MMI); nanowire; polarization; Si; taper;

D O I：

10.1109/LPT.2008.918902

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：

This letter presents a design for diminishing the polarization-dependency of a Si nanowire-based multimode interference (MMI) coupler by using a tapered MMI section. The entrance width and waist width of the tapered MMI section are optimized to obtain a polarization-insensitive MMI length for N-fold self-imaging. The MMI section with a diminished polarization-dependency has a relatively large entrance width, which is beneficial to the separation of adjacent access waveguides for minimizing the coupling between them. One can tune the power splitting ratio of a 2 x 2 Si-nanowire MMI coupler by adjusting the entrance and the waist width of the tapered MMI section.

引用

页码：599 / 601

页数：3

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