Title :
Simultaneous refractive index and temperature measurement using a cascaded long-period grating device
Author :
Gwandu, B.A.L. ; Shu, X. ; Allsop, T.D.P. ; Zhang, W. ; Zhang, L. ; Webb, D.J. ; Bennion, I.
Author_Institution :
Photonics Res. Group, Aston Univ., Birmingham, UK
Abstract :
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.
Keywords :
diffraction gratings; fibre optic sensors; optical fibre amplifiers; refractive index measurement; temperature sensors; EDFA wavelength region; LPGs; cascaded long-period grating device; double-cladding fibre; gain flattening applications; optical sensors; resonance peak; spectral shift; surrounding refractive index measurement; temperature measurement; temperature sensor; Aluminum; Erbium-doped fiber amplifier; Gratings; Optical computing; Optical fiber devices; Optical refraction; Refractive index; Temperature measurement; Temperature sensors; Wavelength measurement;
Conference_Titel :
Sensors, 2002. Proceedings of IEEE
Print_ISBN :
0-7803-7454-1
DOI :
10.1109/ICSENS.2002.1037254
