Modelling of long-period fibre grating response to refractive index higher than that of cladding

HOU, R., GHASSEMLOOY, Z., HASSAN, A. K., LU, C. and DOWKER, K. P. (2001). Modelling of long-period fibre grating response to refractive index higher than that of cladding. Measurement science and technology, 12 (10), 1709-1713.

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Link to published version:: 10.1088/0957-0233/12/10/314

Abstract

In this paper we introduce a new mathematical model, which can be used to investigate the response of a long-period fibre grating to changes in ambient refractive indices of values both greater and less than that of the cladding. A numerical method to calculate the HE core and cladding modes is presented. The results show that even when the ambient refractive index is higher than that of the cladding, the coupling (resonance) wavelengths experience a measurable shift (a few nm). The result obtained suggests that LPGs coated with a material of higher refractive index than the cladding may be used as index sensors.

Item Type: Article
Research Institute, Centre or Group: Materials and Engineering Research Institute > Thin Films Research Centre > Electronic Materials and Sensors Research Group
Identification Number: 10.1088/0957-0233/12/10/314
Depositing User: Helen Garner
Date Deposited: 20 May 2010 15:17
Last Modified: 16 Aug 2010 17:09
URI: http://shura.shu.ac.uk/id/eprint/1991

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