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Thermal performance of metal-clad fiber Bragg grating sensors

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5 Author(s)
Gang-Chih Lin ; Inst. of Electro-Opt. Eng., Nat. Taiwan Univ., Taipei, Taiwan ; L. Wang ; C. C. Yang ; M. C. Shih
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We demonstrate the higher temperature sensitivity of a fiber Bragg grating (FBG) sensor when it is clad with a metal of a large thermal expansion coefficient. With lead (solder) cladding, the sensitivity of Bragg wavelength shift can be enhanced by about five (four) times. A theoretical model was adopted to show quite consistent results. It was found that thermal annealing was crucial for preparing high-quality fiber Bragg grating sensors with metal claddings.

Published in:

IEEE Photonics Technology Letters  (Volume:10 ,  Issue: 3 )