title: Silicon waveguide grating coupler for perfectly vertical fiber based on a tilted membrane structure.
abstract: A grating coupler for interfacing between a silicon-on-insulator waveguide and a single-mode fiber located at a perfectly vertical direction is demonstrated based on a tilted membrane structure. The proposed design is compatible with that of conventional grating couplers for oblique fibers and facilitates mass production. A peak coupling efficiency of 28.5% and 1 dB bandwidth of 38 nm are obtained experimentally for transverse-electrics polarized light. Back reflection in the SOI waveguide is also estimated to be 1.4%. The present grating coupler for perfectly vertical fiber exhibits similar performances to the conventional grating coupler for oblique fiber concerning coupling efficiency, bandwidth, and back reflections.
authors.forename: Liu
authors.initials: L
authors.lastname: Liu
authors.forename: Jianhao
authors.initials: J
authors.lastname: Zhang
authors.forename: Chenzhao
authors.initials: C
authors.lastname: Zhang
authors.forename: Siya
authors.initials: S
authors.lastname: Wang
authors.forename: Chichao
authors.initials: C
authors.lastname: Jin
authors.forename: Yujie
authors.initials: Y
authors.lastname: Chen
authors.forename: Kaixuan
authors.initials: K
authors.lastname: Chen
authors.forename: Tuowen
authors.initials: T
authors.lastname: Xiang
authors.forename: Yaocheng
authors.initials: Y
authors.lastname: Shi