Mode control in planar waveguide grating couplers with double surface corrugation

Mode control in planar waveguide grating couplers with double surface corrugation

Grating couplers with double surface corrugation are proposed to adjust the resonance behavior of both TE and TM modes simultaneously. Through proper selection of parameters, we designed a polarization-independent grating coupler operating at 1.55-μm telecommunication wavelength. Efficiency is achie...

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Bibliographic Details
Main Authors: Xiao, Zhe, Liow, Tsung-Yang, Zhang, Jing, Silalahi, Samson T. H., Shum, Perry Ping, Luan, Feng
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/10356/102731
http://hdl.handle.net/10220/16419
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Institution: Nanyang Technological University
Language: English
Description
Summary:Grating couplers with double surface corrugation are proposed to adjust the resonance behavior of both TE and TM modes simultaneously. Through proper selection of parameters, we designed a polarization-independent grating coupler operating at 1.55-μm telecommunication wavelength. Efficiency is achieved at around 55% for both TE and TM modes, and the polarization-dependent loss is <; 0.05 dB within the spectral window from 1544 to 1561 nm. Furthermore, a double-channel grating coupler is proposed to excite the TE and TM modes at 1.31 and 1.49 μm, respectively. The achievable efficiency is around 60% for both channels with good uniformity.

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