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Power-efficiency enhanced thermally tunable Bragg grating for silica-on-silicon photonics

Power-efficiency enhanced thermally tunable Bragg grating for silica-on-silicon photonics
Power-efficiency enhanced thermally tunable Bragg grating for silica-on-silicon photonics
A thermally tunable Bragg grating device has been fabricated in a silica-on-silicon integrated optical chip, incorporating a suspended microbeam improving power efficiency. A waveguide and Bragg grating are defined through the middle of the microbeam via direct ultraviolet writing. A tuning range of 0.4 nm (50 GHz) is demonstrated at the telecommunication wavelength of 1550 nm. Power consumption during wavelength tuning is measured at 45 pm/mW, which is a factor of 90 better than reported values for similar bulk thermally tuned silica-on-silicon planar devices. The response time to a step change in heating is longer by a similar factor, as expected for a highly power-efficient device. The fabrication procedure involves a deep micromilling process, as well as wet etching and metal deposition. With this response, the device would be suitable for trimming applications and wherever low modulation frequencies are acceptable. A four-point-probe-based temperature measurement was also done to ascertain the temperature reached during tuning and found an average volume temperature of 48 °C, corresponding to 0.4 nm of tuning. The role of stress-induced buckling in device fabrication is included.
1943-0655
1-12
Cooper, Peter
29354b98-c117-4ace-9ca4-1d3ad531485f
Carpenter, Lewis
0daa548e-0d42-4b06-b914-45bfbec41759
Holmes, Chris
16306bb8-8a46-4fd7-bb19-a146758e5263
Sima, Chaotan
f756f89a-ef24-4164-911e-793aac6bf949
Gates, James C.
b71e31a1-8caa-477e-8556-b64f6cae0dc2
Smith, Peter G.R.
8979668a-8b7a-4838-9a74-1a7cfc6665f6
Cooper, Peter
29354b98-c117-4ace-9ca4-1d3ad531485f
Carpenter, Lewis
0daa548e-0d42-4b06-b914-45bfbec41759
Holmes, Chris
16306bb8-8a46-4fd7-bb19-a146758e5263
Sima, Chaotan
f756f89a-ef24-4164-911e-793aac6bf949
Gates, James C.
b71e31a1-8caa-477e-8556-b64f6cae0dc2
Smith, Peter G.R.
8979668a-8b7a-4838-9a74-1a7cfc6665f6

Cooper, Peter, Carpenter, Lewis, Holmes, Chris, Sima, Chaotan, Gates, James C. and Smith, Peter G.R. (2015) Power-efficiency enhanced thermally tunable Bragg grating for silica-on-silicon photonics. IEEE Photonics Journal, 7 (2), 1-12. (doi:10.1109/JPHOT.2015.2415673).

Record type: Article

Abstract

A thermally tunable Bragg grating device has been fabricated in a silica-on-silicon integrated optical chip, incorporating a suspended microbeam improving power efficiency. A waveguide and Bragg grating are defined through the middle of the microbeam via direct ultraviolet writing. A tuning range of 0.4 nm (50 GHz) is demonstrated at the telecommunication wavelength of 1550 nm. Power consumption during wavelength tuning is measured at 45 pm/mW, which is a factor of 90 better than reported values for similar bulk thermally tuned silica-on-silicon planar devices. The response time to a step change in heating is longer by a similar factor, as expected for a highly power-efficient device. The fabrication procedure involves a deep micromilling process, as well as wet etching and metal deposition. With this response, the device would be suitable for trimming applications and wherever low modulation frequencies are acceptable. A four-point-probe-based temperature measurement was also done to ascertain the temperature reached during tuning and found an average volume temperature of 48 °C, corresponding to 0.4 nm of tuning. The role of stress-induced buckling in device fabrication is included.

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More information

Accepted/In Press date: 14 March 2015
Published date: April 2015
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 382593
URI: https://eprints.soton.ac.uk/id/eprint/382593
ISSN: 1943-0655
PURE UUID: 4d7a7efc-1207-41b2-b02d-a5dd06a9a8c7
ORCID for James C. Gates: ORCID iD orcid.org/0000-0001-8671-5987

Catalogue record

Date deposited: 30 Oct 2015 11:28
Last modified: 31 Jul 2019 00:46

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Contributors

Author: Peter Cooper
Author: Lewis Carpenter
Author: Chris Holmes
Author: Chaotan Sima
Author: James C. Gates ORCID iD

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