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Mode Control in Planar Waveguide Grating Couplers With Double Surface Corrugation

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6 Author(s)
Zhe Xiao ; OPTIMUS Photonics Centre of Excellence, Nanyang Technol. Univ., Singapore, Singapore ; Tsung-Yang Liow ; Jing Zhang ; Silalahi, S.T.H.
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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.

Published in:

Photonics Technology Letters, IEEE  (Volume:24 ,  Issue: 19 )

Date of Publication:

Oct.1, 2012

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