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Title: Comparison between femtosecond laser and fusion-arc inscribed long period gratings in photonic crystal fibre
Authors: Allsop, Thomas D P 
Kalli, Kyriacos 
Zhou, Kaiming 
Smith, Graham N. 
Komodromos, Michael 
Sugden, Kate 
Dubov, Mykhaylo V. 
Webb, David J. 
Bennion, Ian 
Keywords: Femtosecond laser;Photonic crystal fibre
Category: Electrical Engineering - Electronic Engineering - Information Engineering
Field: Engineering and Technology
Issue Date: Apr-2009
Publisher: SPIE--The International Society for Optical Engineering
Source: The International Society for Optical Engineering, 7357, art. no. 73570J
Conference: The International Society for Optical Engineering 
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.
ISBN: 978-081947631-9
ISSN: 0277-786X
DOI: 10.1117/12.820790
Rights: © 2009 SPIE--The International Society for Optical Engineering
Type: Conference Papers
Appears in Collections:Δημοσιεύσεις σε συνέδρια/Conference papers

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