Manipulation of beat length and wavelength dependence of a polarization beam splitter using a subwavelength grating

被引：79

作者：

Liu, Lu ^{[1
]}

Deng, Qingzhong ^{[1
]}

Zhou, Zhiping ^{[1
]}

机构：

[1] Peking Univ, Sch Elect Engn & Comp Sci, State Key Lab Adv Opt Commun Syst & Networks, Beijing 100871, Peoples R China

来源：

OPTICS LETTERS | 2016年 / 41卷 / 21期

基金：

中国国家自然科学基金;

关键词：

PLASMONIC WAVE-GUIDE; SILICON-ON-INSULATOR; DIRECTIONAL COUPLER; MULTIMODE INTERFERENCE; MU-M; COMPACT; ULTRACOMPACT;

D O I：

10.1364/OL.41.005126

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A polarization beam splitter assisted by a subwavelength grating (SWG) is proposed. The SWG enables nearly 20-fold beat length reduction for TE, which makes the high extinction ratio (ER) possible. On the other hand, the embedded SWG preferably affects the refractive index of the even mode in the coupling region and broadens the bandwidth of the splitter. As a result, the ER of 28.7 dB (24.8 dB) for TE (TM) is obtained, while the insertion loss is only 0.10 dB (0.11 dB) at the wavelength of 1550 nm. The ER is more than 10 dB in the wavelength range of 1450-1625 nm for TE and 1495 1610 nm for TM. (C) 2016 Optical Society of America

引用

页码：5126 / 5129

页数：4

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