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Proceedings Paper

Discrimination between the refractive index and temperature by using a sandwiched structure of long-period gratings
Author(s): Li-Yang Shao; A. Ping Zhang; Jin-Hua Yan; Sailing He
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Paper Abstract

We present a novel scheme for simultaneous measurement of the external RI and temperature by using the sandwiched long-period gratings (SLPGs). An LPG pair coupling between the guided mode and the low-order cladding mode acts a temperature reference element, and another LPG in-between coupling with the higher-order cladding mode performances an RI sensor. The period and length of the paired LPG (with a center to center distance 47.5mm) are 643 μm and 22.5mm, respectively, and those of LPG in-between are chosen to be 428 μm and 23mm, respectively. The experimental results show that the RI sensitivities of a paired LPG coupling with the third order cladding mode is -6.71 nm/R.I.U (refractive index unit), and the sensitivity of the LPG in between coupling with the ninth order cladding mode is -27.77 nm/R.I.U. The temperature sensitivities of these LPGs are -0.315nm/°C; and -0.337nm/°C;, respectively.

Paper Details

Date Published: 5 December 2005
PDF: 8 pages
Proc. SPIE 6019, Passive Components and Fiber-based Devices II, 60191S (5 December 2005);
Show Author Affiliations
Li-Yang Shao, Zhejiang Univ. (China)
A. Ping Zhang, Zhejiang Univ. (China)
Jin-Hua Yan, Zhejiang Univ. (China)
Sailing He, Zhejiang Univ. (China)

Published in SPIE Proceedings Vol. 6019:
Passive Components and Fiber-based Devices II
Yan Sun; Jianping Chen; Sang Bae Lee; Ian H. White, Editor(s)

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