title: High-extinction-ratio silicon polarization beam splitter with tolerance to waveguide width and coupling length variations.
abstract: We demonstrate a compact silicon polarization beam splitter (PBS) based on grating-assisted contradirectional couplers (GACCs). Over 30-dB extinction ratios and less than 1-dB insertion losses are achieved for both polarizations. The proposed PBS exhibits tolerance in width variation, and the polarization extinction ratios remain higher than 20 dB for both polarizations when the width variation is adjusted from + 10 to -10 nm. Benefiting from the enhanced coupling by the GACCs, the polarization extinction ratio can be kept higher than 15 dB and the insertion loss is lower than 2 dB for both polarizations when the coupling length varies from 30.96 to 13.76 μm.
authors.forename: Yong
authors.initials: Y
authors.lastname: Zhang
authors.forename: Yu
authors.initials: Y
authors.lastname: He
authors.forename: Jiayang
authors.initials: J
authors.lastname: Wu
authors.forename: Xinhong
authors.initials: X
authors.lastname: Jiang
authors.forename: Ruili
authors.initials: R
authors.lastname: Liu
authors.forename: Ciyuan
authors.initials: C
authors.lastname: Qiu
authors.forename: Xiaoqing
authors.initials: X
authors.lastname: Jiang
authors.forename: Jianyi
authors.initials: J
authors.lastname: Yang
authors.forename: Christine
authors.initials: C
authors.lastname: Tremblay
authors.forename: Yikai
authors.initials: Y
authors.lastname: Su