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

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Rollinson, Claire M, Wade, Scott A, Dragomir, Nicoleta, Baxter, Gregory W, 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

Abstract

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.

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Item type Article
URI https://vuir.vu.edu.au/id/eprint/2111
DOI https://doi.org/10.1016/j.optcom.2005.07.008
Official URL http://dx.doi.org/10.1016/j.optcom.2005.07.008
Subjects Historical > Faculty/School/Research Centre/Department > School of Engineering and Science
Current > FOR Classification > 0205 Optical Physics
Keywords ResPubID: 16367, ResPubID18572, fibre bragg grating, optical fibre sensors, higher-order grating reflections
Citations in Scopus 33 - View on Scopus
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