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Planar surface implanted diffractive grating couplers in SOI

Planar surface implanted diffractive grating couplers in SOI
Planar surface implanted diffractive grating couplers in SOI
Grating couplers are used to efficiently couple light from an optical fibre to a silicon waveguide as they allow light to be coupled into or out from any location on the device without the need for cleaving. However, using the typical surface relief grating fabrication method reduces surface planarity and hence makes further processing more difficult. The ability to manufacture high quality material layers on top of a grating coupler allows multiple active optical layers to be realized for multi-layer integrated optical circuits, and may enable monolithic integration of optical and electronic circuits on separate layers. Furthermore, the nature of the refractive index change may enable removal via rapid thermal annealing for wafer scale testing applications. We demonstrate for the first time a coupling device utilising a refractive index change introduced by lattice disorder. Simulations show 44% of the power can be extracted from the waveguide by using uniform implanted gratings, which is not dissimilar to the performance of typical uniform surface relief gratings currently used. Losses determined empirically, of 5.5dB per coupler have been demonstrated.
1094-4087
1077-1084
Topley, R.
f43e052f-31c2-47a5-a627-3ce44fbc99a1
O'Faolain, L.
a3225d11-a3e4-47bc-a601-e2dca9020ad3
Thomson, D.J.
17c1626c-2422-42c6-98e0-586ae220bcda
Gardes, F.Y.
7a49fc6d-dade-4099-b016-c60737cb5bb2
Mashanovich, G.Z.
c806e262-af80-4836-b96f-319425060051
Reed, G.T.
ca08dd60-c072-4d7d-b254-75714d570139
Topley, R.
f43e052f-31c2-47a5-a627-3ce44fbc99a1
O'Faolain, L.
a3225d11-a3e4-47bc-a601-e2dca9020ad3
Thomson, D.J.
17c1626c-2422-42c6-98e0-586ae220bcda
Gardes, F.Y.
7a49fc6d-dade-4099-b016-c60737cb5bb2
Mashanovich, G.Z.
c806e262-af80-4836-b96f-319425060051
Reed, G.T.
ca08dd60-c072-4d7d-b254-75714d570139

Topley, R., O'Faolain, L., Thomson, D.J., Gardes, F.Y., Mashanovich, G.Z. and Reed, G.T. (2014) Planar surface implanted diffractive grating couplers in SOI. Optics Express, 22 (1), 1077-1084. (doi:10.1364/OE.22.001077).

Record type: Article

Abstract

Grating couplers are used to efficiently couple light from an optical fibre to a silicon waveguide as they allow light to be coupled into or out from any location on the device without the need for cleaving. However, using the typical surface relief grating fabrication method reduces surface planarity and hence makes further processing more difficult. The ability to manufacture high quality material layers on top of a grating coupler allows multiple active optical layers to be realized for multi-layer integrated optical circuits, and may enable monolithic integration of optical and electronic circuits on separate layers. Furthermore, the nature of the refractive index change may enable removal via rapid thermal annealing for wafer scale testing applications. We demonstrate for the first time a coupling device utilising a refractive index change introduced by lattice disorder. Simulations show 44% of the power can be extracted from the waveguide by using uniform implanted gratings, which is not dissimilar to the performance of typical uniform surface relief gratings currently used. Losses determined empirically, of 5.5dB per coupler have been demonstrated.

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More information

Accepted/In Press date: 8 December 2013
e-pub ahead of print date: 10 January 2014
Published date: 10 January 2014
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 367455
URI: https://eprints.soton.ac.uk/id/eprint/367455
ISSN: 1094-4087
PURE UUID: 44177227-f123-47c1-9fc9-85d383782f93

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Date deposited: 30 Jul 2014 10:51
Last modified: 19 Jul 2019 21:06

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Contributors

Author: R. Topley
Author: L. O'Faolain
Author: D.J. Thomson
Author: F.Y. Gardes
Author: G.T. Reed

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