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Proceedings Paper

Numerical investigation of multimode interference in a multimode fiber and its applications in optical sensing
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Paper Abstract

Multimode interference occurring in a singlemode-multimode-singlemode fiber structure is numerically investigated with a wide-angle beam propagation method using the cylindrical coordinate. Two application examples in optical sensing are presented. 1) The wavelength sensitivity of the singlemode-multimode-singlemode structure is utilized and with an appropriate length of the multimode fiber section, the device is developed as an edge filter for a ratiometric wavelength measurement system. 2) When the multimode fiber cladding is removed, it becomes the singlemode-multimode core-singlemode structure and can be developed as an all-fiber refractometer sensor with an optimal length of multimode core section. The designed refractometer can offer an estimated resolution of about 5.4x10-5 for refractive index from 1.33 to 1.45, which is competitive as compared to existing waveguide based optical refractometer sensors while offering a much simpler configuration.

Paper Details

Date Published: 22 April 2006
PDF: 10 pages
Proc. SPIE 6189, Optical Sensing II, 61891N (22 April 2006); doi: 10.1117/12.662197
Show Author Affiliations
Qian Wang, Dublin Institute of Technology (Ireland)
Gerald Farrell, Dublin Institute of Technology (Ireland)

Published in SPIE Proceedings Vol. 6189:
Optical Sensing II
Brian Culshaw; Anna G. Mignani; Hartmut Bartelt; Leszek R. Jaroszewicz, Editor(s)

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