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Reflections near 1030 nm from 1540 nm fibre Bragg gratings: evidence of a complex refractive index structure

Rollinson, C. M and Wade, Scott A and Dragomir, Nicoleta and Baxter, Gregory W and Collins, Stephen F and Roberts, A (2005) Reflections near 1030 nm from 1540 nm fibre Bragg gratings: evidence of a complex refractive index structure. Optics communications, 256 (4-6). pp. 310-318. ISSN 0030-4018

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Reflections at wavelengths other than the expected harmonics of phase-mask-written fibre Bragg gratings (FBGs) have been observed. It is argued that these are a consequence of the complex structure induced in the fibre core during fabrication. Various FBGs have been investigated, involving different formation regimes and fibre types, different writing wavelengths, exposure sources (e.g., pulsed and continuous wave) and different phase masks. The experiments showed that no specific observation could be attributed to a particular aspect of the fabrication process except the phase mask. The lack of higher diffraction order suppression of the phase mask is suggested as the origin of the complex structure in refractive index modulation that is induced within the fibre core, giving rise to more than one set of harmonic reflections that would be expected from a simple, single period grating.

Item Type: Article
Uncontrolled Keywords: ResPubID: 16367, ResPubID18572, fibre bragg grating, optical fibre sensors, higher-order grating reflections
Subjects: Faculty/School/Research Centre/Department > School of Engineering and Science
FOR Classification > 0205 Optical Physics
Depositing User: VUIR
Date Deposited: 07 Dec 2009 22:52
Last Modified: 15 Jan 2015 01:14
DOI: 10.1016/j.optcom.2005.07.008
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Citations in Scopus: 18 - View on Scopus

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