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Title: Design for broadband high-efficiency grating couplers
Authors: Xiao, Zhe
Luan, Feng
Liow, Tsung-Yang
Zhang, Jing
Shum, Perry Ping
Keywords: DRNTU::Engineering::Electrical and electronic engineering
Issue Date: 2012
Source: Xiao, Z., Luan, F., Liow, T.-Y., Zhang, J., & Shum, P. (2012). Design for broadband high-efficiency grating couplers. Optics Letters, 37(4), 530-532.
Series/Report no.: Optics letters
Abstract: 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 for fiber to waveguide excitation. The coupling bandwidth formula is deduced. A simple parameter-separate optimization procedure is proposed for general layered grating couplers for high coupling efficiency. Using our principle, we optimized a grating coupler for a horizontal slot waveguide operating at wavelength 1.55 μm for TM polarization. The grating coupler has 1 dB bandwidth of 60 nm and coupling efficiency of 65% with incident light from single-mode optical fiber (SMF) at 8°.
ISSN: 0146-9592
DOI: 10.1364/OL.37.000530
Rights: © 2012 Optical Society of America. This paper was published in Optics Letters and is made available as an electronic reprint (preprint) with permission of Optical Society of America. The paper can be found at the following official DOI: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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