Abstract

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.

© 2016 Optical Society of America

Compact and high extinction ratio polarization beam splitter using subwavelength grating couplers

Yin Xu and Jinbiao Xiao
Opt. Lett. 41(4) 773-776 (2016)

Compact and broadband silicon-based polarization beam splitter using asymmetric directional couplers embedded with subwavelength gratings and slots

Sijie Dai and Jinbiao Xiao
Appl. Opt. 61(1) 126-134 (2022)

Ultra-broadband polarization beam splitter with silicon subwavelength-grating waveguides

Chenlei Li, Ming Zhang, John E. Bowers, and Daoxin Dai
Opt. Lett. 45(8) 2259-2262 (2020)

Subwavelength-grating-assisted broadband polarization-independent directional coupler

Lu Liu, Qingzhong Deng, and Zhiping Zhou
Opt. Lett. 41(7) 1648-1651 (2016)

Broadband and high-extinction-ratio polarization beam splitter on tilted subwavelength gratings waveguides

Jinye Yang, Yue Dong, Yin Xu, Bo Zhang, and Yi Ni
Appl. Opt. 59(25) 7705-7711 (2020)