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Proceedings Paper

Comparison between femtosecond laser and fusion-arc inscribed long period gratings in photonic crystal fibre
Author(s): T. Allsop; K. Kalli; K. Zhou; G. Smith; M. Komodromos; K. Sugden; M. Dubov; D. J. Webb; I. Bennion
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Paper Abstract

The use of high intensity femtosecond laser sources for inscribing fibre gratings has attained significant interest. The principal advantage of high-energy pulses is their ability for grating inscription in any material type without preprocessing or special core doping. In the field of fibre optical sensing LPGs written in photonic crystal fibre have a distinct advantage of low temperature sensitivity over gratings written in conventional fibre and thus minimal temperature cross-sensitivity. Previous studies have indicated that LPGs written by a point-by-point inscription scheme using a low repetition femtosecond laser exhibit post-fabrication evolution leading to temporal instabilities at room temperatures with respect to spectral location, strength and birefringence of the attenuation bands. These spectral instabilities of LPGs are studied in photonic crystal fibres (endlessly single mode microstructure fibre) to moderately high temperatures 100°C to 200°C and their performance compared to fusion-arc fabricated LPG. Initial results suggest that the fusion-arc fabricated LPG demonstrate less spectral instability for a given constant and moderate temperature, and are similar to the results obtained when inscribed in a standard single mode fibre.

Paper Details

Date Published: 6 May 2009
PDF: 10 pages
Proc. SPIE 7357, Photonic Crystal Fibers III, 73570J (6 May 2009); doi: 10.1117/12.820790
Show Author Affiliations
T. Allsop, Aston Univ. (United Kingdom)
K. Kalli, Cyprus Univ. of Technology (Cyprus)
K. Zhou, Aston Univ. (United Kingdom)
G. Smith, Aston Univ. (United Kingdom)
M. Komodromos, Frederick Institute of Technology (Cyprus)
K. Sugden, Aston Univ. (United Kingdom)
M. Dubov, Aston Univ. (United Kingdom)
D. J. Webb, Aston Univ. (United Kingdom)
I. Bennion, Aston Univ. (United Kingdom)


Published in SPIE Proceedings Vol. 7357:
Photonic Crystal Fibers III
Kyriacos Kalli, Editor(s)

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