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Proceedings Paper

A simple interrogation technique for refractive index measurement using multimode interference structure
Author(s): Susana Silva; O. Frazão; J. L. Santos; F. X. Malcata
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Paper Abstract

A simple interrogation technique for refractive index measurement is proposed, using a multimode interference-based fiber tip structure. The fiber probe is a section of a multimode fiber, spliced to a single-mode fiber and interrogated in reflection. The interrogation technique uses two fiber Bragg gratings as discrete optical sources; by means of relative intensity variation of the reflected signals, those sources will provide a measurement of refractive index changes, while taking advantage of the MMI-based fiber tip. The read-out system uses a WDM and two photodetectors to separate both signals. A sensitivity of -5.87/RIU, in the refractive index range 1.30- 1.38, was achieved with the proposed configuration.

Paper Details

Date Published: 26 July 2011
PDF: 7 pages
Proc. SPIE 8001, International Conference on Applications of Optics and Photonics, 80011I (26 July 2011); doi: 10.1117/12.890150
Show Author Affiliations
Susana Silva, INESC Porto (Portugal)
Univ. do Porto (Portugal)
O. Frazão, INESC Porto (Portugal)
J. L. Santos, INESC Porto (Portugal)
Univ. do Porto (Portugal)
F. X. Malcata, ISMAI (Portugal)
CIMAR/CIIMAR (Portugal)


Published in SPIE Proceedings Vol. 8001:
International Conference on Applications of Optics and Photonics
Manuel Filipe Costa, Editor(s)

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