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Proceedings Paper

Self-referencing intensity-encoded fibre-optic sensors using radio-frequency ring resonators
Author(s): J. Montalvo; C. Vazquez
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Paper Abstract

A Radio-Frequency (RF) Ring Resonator (RR) Fibre-Optic sensor (FOS) configuration is theoretically analyzed and a specific example to show the principle of operation is reported: an intensity-encoded fiber-optic sensor prototype based on the optical losses due to fibre curvature. The proposed configuration can be used for self-referencing purposes and to improve sensitivity as regards the measurand in any intensity fibre-optic sensor. Light intensity fluctuations to be measured are converted to ring resonator losses that produce high amplitude variations of the transfer function of the ring resonator. The use of an Erbium-Doped Waveguide Amplifier (EDWA) offers the theoretical possibility of increasing sensitivities to the greatest extent previously reported. A proper selection of the ring resonator point of operation is achieved using an optical attenuator, a variable coupling ratio coupler and an EDWA if needed. Modulation of the optical carrier by a RF signal allows overcoming possible instabilities due to environmental perturbations and simplifying the detection electronics. Two self-reference techniques to overcome unwanted source and local intensity fluctuations are developed. Both self-referencing techniques avoid possible intensity fluctuations because of long leads perturbations, in case of remote operation. Temperature effect on the measurements is also discussed.

Paper Details

Date Published: 7 July 2005
PDF: 12 pages
Proc. SPIE 5840, Photonic Materials, Devices, and Applications, (7 July 2005); doi: 10.1117/12.608329
Show Author Affiliations
J. Montalvo, Univ. Carlos III de Madrid (Spain)
C. Vazquez, Univ. Carlos III de Madrid (Spain)

Published in SPIE Proceedings Vol. 5840:
Photonic Materials, Devices, and Applications
Goncal Badenes; Derek Abbott; Ali Serpenguzel, Editor(s)

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