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High sensitivity evanescent field fiber Bragg grating sensor

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5 Author(s)
Chryssis, A.N. ; Dept. of Electr. & Comput. Eng., Univ. of Maryland, College Park, MD, USA ; Lee, S.M. ; Lee, S.B. ; Saini, S.S.
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Increased sensitivity to change in surrounding index is shown by etching the core of a fiber Bragg grating. A maximum sensitivity of 1394 nm/riu is achieved as the surrounding index approaches the core index. Assuming a detectable spectral resolution of 0.01 nm realized in the experiment, the sensor achieves a minimum detectable index resolution of 7.2×10-6 when the index of the surrounding medium is 1.44. The sensor can be used as a chemical and biosensor and multiple sensors can be multiplexed and interrogated along a single fiber.

Published in:

Photonics Technology Letters, IEEE  (Volume:17 ,  Issue: 6 )