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

Ruozhou Hou, Zabih Ghassemlooy, Aseel Kadhim Hassan, Chao Lu, K. Dowker

Research output: Contribution to journalArticlepeer-review

76 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)1709-1713
JournalMeasurement Science and Technology
Volume12
Issue number10
DOIs
Publication statusPublished - 2001

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