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Proceedings Paper

Design and realization of a side-polished single-mode fiber optic high-sensitive temperature sensor
Author(s): B. Nagaraju; R. K. Varshney; B. P. Pal; A. Singh; G. Monnom; B. Dussardier
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Paper Abstract

A high sensitive temperature sensor based on evanescent field coupling between a side-polished fiber half-coupler (SPFHC) and a thermo-optic multimode overlay waveguide (MMOW) is designed and demonstrated. Such a structure essentially functions as an asymmetric directional coupler with a band-stop characteristic attributable to the wavelengthdependent resonant coupling between the mode of the SPFHC and one or more modes of the MMOW. A slight change in temperature leads to a significant shift in the phase resonance-coupling wavelength ( λr ) between the MMOW and SPFHC λr, which is easily measurable. The wavelength sensitivity of the device is measured to be ~ 5.3 nm/°C within the measurement range of 26-70°C; this sensitivity is more than 5 times higher compared to earlier reported temperature sensors of this kind. The SPFHC was fabricated by selective polishing of the cladding from one side of a bent telecommunication standard single-mode fiber and the MMOW was formed on top of the SPFHC through spin coating. A semi- numerical rigorous normal mode analysis was employed at the design stage by including the curvature effect of the fiber lay in the half-coupler block and the resultant z-dependent evanescent coupling mechanism. An excellent agreement between theoretical and experimental results is found.

Paper Details

Date Published: 18 November 2008
PDF: 6 pages
Proc. SPIE 7138, Photonics, Devices, and Systems IV, 71381H (18 November 2008); doi: 10.1117/12.818039
Show Author Affiliations
B. Nagaraju, Indian Institute of Technology Delhi (India)
R. K. Varshney, Indian Institute of Technology Delhi (India)
B. P. Pal, Indian Institute of Technology Delhi (India)
lab. de Physique de la Matiere Condensee, CNRS, Univ. de Nice Sophia Antipolis (France)
A. Singh, Indian Institute of Technology Delhi (India)
G. Monnom, Univ. de Nice Sophia Antipolis (France)
B. Dussardier, Univ. de Nice Sophia Antipolis (France)

Published in SPIE Proceedings Vol. 7138:
Photonics, Devices, and Systems IV
Pavel Tománek; Dagmar Senderáková; Miroslav Hrabovský, Editor(s)

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