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Proceedings Paper

Interrogation and mitigation of polarization effects for standard and birefringent FBGs
Author(s): Selwan K. Ibrahim; Jan Van Roosbroeck; John A. O'Dowd; Bram Van Hoe; Eric Lindner; Johan Vlekken; Martin Farnan; Devrez M. Karabacak; Johannes M. Singer
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Paper Abstract

Optical sensors based on Fiber Bragg Gratings (FBGs) are used in several applications and industries. Several inscription techniques and type of fibers can be used. However, depending on the writing process, type of fiber used and the packaging of the sensor a Polarization Dependent Frequency Shift (PDFS) can often be observed with polarized tunable laser based optical interrogators. Here we study the PDFS of the FBG peak for the different FBG types. A PDFS of <1pm up to >20pm was observed across the FBGs. To mitigate and reduce this effect we propose a polarization mitigation technique which relies on a synchronous polarization switch to reduce the effect typically by a factor greater than 4. In other scenarios the sensor itself is designed to be birefringent (Bi-FBG) to allow pressure and/or simultaneous temperature and strain measurements. Using the same polarization switch we demonstrate how we can interrogate the Bi-FBGs with high accuracy to enable high performance of such sensors to be achievable.

Paper Details

Date Published: 12 May 2016
PDF: 12 pages
Proc. SPIE 9852, Fiber Optic Sensors and Applications XIII, 98520H (12 May 2016); doi: 10.1117/12.2223002
Show Author Affiliations
Selwan K. Ibrahim, FAZ Technology Ltd. (Ireland)
Jan Van Roosbroeck, FBGS International NV (Belgium)
John A. O'Dowd, FAZ Technology Ltd. (Ireland)
Bram Van Hoe, FBGS International NV (Belgium)
Eric Lindner, FBGS International NV (Belgium)
FBGS Technologies GmbH (Germany)
Johan Vlekken, FBGS International NV (Belgium)
Martin Farnan, FAZ Technology Ltd. (Ireland)
Devrez M. Karabacak, FAZ Technology Ltd. (Ireland)
Fugro Technology BV (Netherlands)
Johannes M. Singer, FAZ Technology Ltd. (Ireland)
Fugro Technology BV (Netherlands)

Published in SPIE Proceedings Vol. 9852:
Fiber Optic Sensors and Applications XIII
Eric Udd; Gary Pickrell; Henry H. Du, Editor(s)

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