Design for broadband high-efficiency grating couplers

• Main Authors: Xiao, Zhe, Luan, Feng, Liow, Tsung-Yang, Zhang, Jing, Shum, Perry Ping
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2013
• Subjects: DRNTU::Engineering::Electrical and electronic engineering
• Online Access: https://hdl.handle.net/10356/99207; http://hdl.handle.net/10220/10945
• Institution: Nanyang Technological University

In this Letter, we propose general optimization methods to design broadband high-efficiency grating couplers for planar waveguides. We attribute the coupling bandwidth to the mismatch of effective indices between the diffracted beam and the actual grating structure around the operation wavelength fo...