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Proceedings Paper

Low-cost fully integrated fiber Bragg grating interrogation system
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Paper Abstract

Fiber Bragg gratings can be used for monitoring different parameters in a wide variety of materials and constructions. The interrogation of fiber Bragg gratings traditionally consists of an expensive and spacious peak tracking or spectrum analyzing unit which needs to be deployed outside the monitored structure. We present a dynamic low-cost interrogation system for fiber Bragg gratings which can be integrated with the fiber itself, limiting the fragile optical in- and outcoupling interfaces and providing a compact, unobtrusive driving and read-out unit. The reported system is based on an embedded Vertical Cavity Surface Emitting Laser (VCSEL) which is tuned dynamically at 1 kHz and an embedded photodiode. Fiber coupling is provided through a dedicated 45° micromirror yielding a 90° in-the-plane coupling and limiting the total thickness of the fiber coupled optoelectronic package to 550 μm. The red-shift of the VCSEL wavelength is providing a full reconstruction of the spectrum with a range of 2.5 nm. A few-mode fiber with fiber Bragg gratings at 850 nm is used to prove the feasibility of this low-cost and ultra-compact interrogation approach.

Paper Details

Date Published: 30 January 2012
PDF: 8 pages
Proc. SPIE 8351, Third Asia Pacific Optical Sensors Conference, 83510U (30 January 2012); doi: 10.1117/12.914253
Show Author Affiliations
B. Van Hoe, Imec, Ghent Univ. (Belgium)
E. Bosman, Imec, Ghent Univ. (Belgium)
J. Missinne, Imec, Ghent Univ. (Belgium)
S. Kalathimekkad, Imec, Ghent Univ. (Belgium)
G. Lee, Aston Univ. (United Kingdom)
Z. Yan, Aston Univ. (United Kingdom)
K. Sugden, Aston Univ. (United Kingdom)
D. J. Webb, Aston Univ. (United Kingdom)
G. Van Steenberge, Imec, Ghent Univ. (Belgium)
P. Van Daele, Imec, Ghent Univ. (Belgium)

Published in SPIE Proceedings Vol. 8351:
Third Asia Pacific Optical Sensors Conference
John Canning; Gangding Peng, Editor(s)

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