SENSITIVITY ENHANCEMENT OF D-FIBER METHANE GAS SENSOR USING HIGH-INDEX OVERLAY

Citation
Fa. Muhammad et al., SENSITIVITY ENHANCEMENT OF D-FIBER METHANE GAS SENSOR USING HIGH-INDEX OVERLAY, IEE proceedings. Part J, Optoelectronics, 140(2), 1993, pp. 115-118
Citations number
7
Categorie Soggetti
Engineering, Eletrical & Electronic",Optics,Telecommunications
ISSN journal
02673932
Volume
140
Issue
2
Year of publication
1993
Pages
115 - 118
Database
ISI
SICI code
0267-3932(1993)140:2<115:SEODMG>2.0.ZU;2-S
Abstract
The authors determine that the sensitivity of a D-fibre methane gas se nsor can be improved by overcoating the flat surface of the fibre with a high index layer. Using the finite-difference/perturbation theory t echnique, the enhancement factor over uncoated D-fibre is computed. Th e results compare favourably with those obtained from analytical expre ssions and the matrix method for a planar waveguide structure which mo dels the overcoated D-fibre. From theoretical results it is concluded that the sensitivity can realistically be improved by an order of magn itude over an uncoated fibre.