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Modelling and performance analysis of a fibre-grating interrogation system using an acousto-optic tunable filter

Modelling and performance analysis of a fibre-grating interrogation system using an acousto-optic tunable filter
Modelling and performance analysis of a fibre-grating interrogation system using an acousto-optic tunable filter
The performance of a fiber grating interrogation system using an acousto-optic tunable filter (AOTF) is analyzed. An equivalent linear circuit is presented to describe the system, which tracks the wavelength of a fiber Bragg grating (FBG) sensor in a FBG sensor array. From the model, the tracking resolution of a shot-noise-limited system has been determined for both transmissive and reflective interrogation of FBG's. An optimum ratio between the bandwidths of the FBG and the AOTF has been derived. Experimental results of a tracking system are presented to validate the theoretical predictions. The theory should also be suitable for interrogation systems using other forms of tunable bandpass filters for tracking the FBG wavelength.
0733-8724
391-396
Xu, M.G.
9cd111ff-5235-42c8-8a89-47899e7e8a26
Geiger, H.
ed078c74-a1f0-4816-aee5-6adec67b9ed3
Dakin, J.P.
04891b9b-5fb5-4245-879e-9e7361adf904
Xu, M.G.
9cd111ff-5235-42c8-8a89-47899e7e8a26
Geiger, H.
ed078c74-a1f0-4816-aee5-6adec67b9ed3
Dakin, J.P.
04891b9b-5fb5-4245-879e-9e7361adf904

Xu, M.G., Geiger, H. and Dakin, J.P. (1996) Modelling and performance analysis of a fibre-grating interrogation system using an acousto-optic tunable filter. IEEE Journal of Lightwave Technology, 14 (3), 391-396. (doi:10.1109/50.485598).

Record type: Article

Abstract

The performance of a fiber grating interrogation system using an acousto-optic tunable filter (AOTF) is analyzed. An equivalent linear circuit is presented to describe the system, which tracks the wavelength of a fiber Bragg grating (FBG) sensor in a FBG sensor array. From the model, the tracking resolution of a shot-noise-limited system has been determined for both transmissive and reflective interrogation of FBG's. An optimum ratio between the bandwidths of the FBG and the AOTF has been derived. Experimental results of a tracking system are presented to validate the theoretical predictions. The theory should also be suitable for interrogation systems using other forms of tunable bandpass filters for tracking the FBG wavelength.

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Published date: March 1996
Organisations: Optoelectronics Research Centre

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Local EPrints ID: 78177
URI: http://eprints.soton.ac.uk/id/eprint/78177
ISSN: 0733-8724
PURE UUID: c8dea3c8-b21b-4a33-b276-67c8c9d904c0

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Date deposited: 11 Mar 2010
Last modified: 14 Mar 2024 00:08

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Contributors

Author: M.G. Xu
Author: H. Geiger
Author: J.P. Dakin

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