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Sandwiched long-period gratings for simultaneous measurement of refractive index and temperature

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4 Author(s)
Zhang, A.P. ; Dept. of Opt. Eng., Zhejiang Univ., China ; Li-Yang Shao ; Jin-Fei Ding ; Sailing He

A simultaneous measurement of external refractive-index (RI) and temperature is presented by using a sandwiched structure of long-period gratings (LPGs). An LPG pair with codirectional coupling between the guided mode and a low-order cladding mode acts as a temperature sensor with low RI sensitivity, whereas another in-between LPG which couples the guided mode with a higher order cladding mode performs as an RI sensing element. The experimental results show such an all-LPG structure is not only suitable for use as a compact temperature-compensated RI sensor, but also convenient for fabrication.

Published in:

Photonics Technology Letters, IEEE  (Volume:17 ,  Issue: 11 )