title: Efficient silicon nitride grating coupler with distributed Bragg reflectors.
abstract: In this paper we have designed, fabricated and characterized a high efficiency Silicon nitride grating coupler at 1490 nm. Distributed Bragg reflectors as bottom mirrors are employed to improve the coupling efficiency by reflecting the downward traveling light. The peak coupling efficiency obtained is about -2.5 dB and the 1-dB bandwidth is 53 nm. The fabrication process is CMOS-compatible and is ready to be integrated with photonic circuits.
authors.forename: Huijuan
authors.initials: H
authors.lastname: Zhang
authors.forename: Chao
authors.initials: C
authors.lastname: Li
authors.forename: Xiaoguang
authors.initials: X
authors.lastname: Tu
authors.forename: Junfeng
authors.initials: J
authors.lastname: Song
authors.forename: Haifeng
authors.initials: H
authors.lastname: Zhou
authors.forename: Xianshu
authors.initials: X
authors.lastname: Luo
authors.forename: Ying
authors.initials: Y
authors.lastname: Huang
authors.forename: Mingbin
authors.initials: M
authors.lastname: Yu
authors.forename: G Q
authors.initials: GQ
authors.lastname: Lo