Design for broadband high-efficiency grating couplers
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...
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sg-ntu-dr.10356-992072020-09-26T22:04:21Z Design for broadband high-efficiency grating couplers Xiao, Zhe Luan, Feng Liow, Tsung-Yang Zhang, Jing Shum, Perry Ping School of Electrical and Electronic Engineering Research Techno Plaza DRNTU::Engineering::Electrical and electronic engineering 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°. Published version 2013-07-04T03:50:38Z 2019-12-06T20:04:38Z 2013-07-04T03:50:38Z 2019-12-06T20:04:38Z 2012 2012 Journal Article 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. 0146-9592 https://hdl.handle.net/10356/99207 http://hdl.handle.net/10220/10945 10.1364/OL.37.000530 en Optics letters © 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: [http://dx.doi.org/10.1364/OL.37.000530]. 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. application/pdf |
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DRNTU::Engineering::Electrical and electronic engineering Xiao, Zhe Luan, Feng Liow, Tsung-Yang Zhang, Jing Shum, Perry Ping Design for broadband high-efficiency grating couplers |
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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°. |
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School of Electrical and Electronic Engineering |
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School of Electrical and Electronic Engineering Xiao, Zhe Luan, Feng Liow, Tsung-Yang Zhang, Jing Shum, Perry Ping |
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Article |
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Xiao, Zhe Luan, Feng Liow, Tsung-Yang Zhang, Jing Shum, Perry Ping |
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Xiao, Zhe |
title |
Design for broadband high-efficiency grating couplers |
title_short |
Design for broadband high-efficiency grating couplers |
title_full |
Design for broadband high-efficiency grating couplers |
title_fullStr |
Design for broadband high-efficiency grating couplers |
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Design for broadband high-efficiency grating couplers |
title_sort |
design for broadband high-efficiency grating couplers |
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2013 |
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https://hdl.handle.net/10356/99207 http://hdl.handle.net/10220/10945 |
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1681056974182023168 |