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Simultaneous refractive index and temperature measurement using a cascaded long-period grating device

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7 Author(s)
Gwandu, B.A.L. ; Photonics Res. Group, Aston Univ., Birmingham, UK ; Shu, X. ; Allsop, T.D.P. ; Zhang, W.
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We present a compact scheme for simultaneous temperature and surrounding refractive index (SRI) measurement using two long period gratings (LPGs) of different periods inscribed side-by-side in a single piece of a double-cladding fibre. One of the LPGs is sensitive to both SRI and temperature changes whilst the second is SRI-insensitive but shows spectral shift with temperature changes. In addition, we show that a resonance peak of the SRI-insensitive LPG can be designed to appear in the EDFA wavelength region with potential use for gain flattening applications.

Published in:

Sensors, 2002. Proceedings of IEEE  (Volume:2 )

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