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Coupling to nanophotonic waveguides using a dual grating-assisted directional coupler

Coupling to nanophotonic waveguides using a dual grating-assisted directional coupler
Coupling to nanophotonic waveguides using a dual grating-assisted directional coupler
An analysis of a device we have called a dual grating-assisted directional coupler (DGADC) in silicon-on-insulator technology is presented. The device enables efficient coupling from optical fibres to small waveguides, typically <1 µm in cross-sectional dimensions. Coupling efficiency and device length are determined as functions of layer thicknesses and refractive indices, grating periods, depths and duty ratios, and finally wavelength. For our example calculation of coupling to a 250 nm silicon waveguide, this efficient and robust coupler can have coupling efficiency as high as 90%, while the wavelength range can have an FWHM of ~1.6 nm at resonance. Fabrication tolerances have also been analysed and they are up to two orders of magnitude larger than those of a GADC with only one grating.
1350-2433
41-48
Mashanovich, G.Z.
c806e262-af80-4836-b96f-319425060051
Passaro, V.M.N.
828f0106-cfbc-47ea-b672-7185387214e5
Reed, G.T.
ca08dd60-c072-4d7d-b254-75714d570139
Mashanovich, G.Z.
c806e262-af80-4836-b96f-319425060051
Passaro, V.M.N.
828f0106-cfbc-47ea-b672-7185387214e5
Reed, G.T.
ca08dd60-c072-4d7d-b254-75714d570139

Mashanovich, G.Z., Passaro, V.M.N. and Reed, G.T. (2005) Coupling to nanophotonic waveguides using a dual grating-assisted directional coupler. IEE Proceedings - Optoelectronics, 152 (1), 41-48. (doi:10.1049/ip-opt:20055006).

Record type: Article

Abstract

An analysis of a device we have called a dual grating-assisted directional coupler (DGADC) in silicon-on-insulator technology is presented. The device enables efficient coupling from optical fibres to small waveguides, typically <1 µm in cross-sectional dimensions. Coupling efficiency and device length are determined as functions of layer thicknesses and refractive indices, grating periods, depths and duty ratios, and finally wavelength. For our example calculation of coupling to a 250 nm silicon waveguide, this efficient and robust coupler can have coupling efficiency as high as 90%, while the wavelength range can have an FWHM of ~1.6 nm at resonance. Fabrication tolerances have also been analysed and they are up to two orders of magnitude larger than those of a GADC with only one grating.

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More information

Published date: 27 February 2005
Organisations: Optoelectronics Research Centre, NANO

Identifiers

Local EPrints ID: 356517
URI: https://eprints.soton.ac.uk/id/eprint/356517
ISSN: 1350-2433
PURE UUID: 5cccd5d8-dea5-46d2-aeb2-e6f67201d3cd

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Date deposited: 24 Oct 2013 13:57
Last modified: 22 Oct 2018 16:33

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Contributors

Author: V.M.N. Passaro
Author: G.T. Reed

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