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Cladding Mode Coupling in a Wide-Band Fiber Bragg Grating and its Application to a Power-Interrogated Temperature Sensor

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4 Author(s)
Lunlun Xian ; Grad. Sch. of Sci. & Technol., Shizuoka Univ., Hamamatsu, Japan ; Peng Wang ; Ogusu, K. ; Hongpu Li

Quantitative analysis for the cladding mode coupling in a linearly chirped fiber Bragg grating (FBG) with broad bandwidth is theoretically and experimentally demonstrated for the first time. It is found that due to the cladding mode effect, there exists a strong slope in the reflection spectrum, which could be larger than 5 dB within the 10-nm bandwidth of FBG. Based on this phenomenon, a novel temperature sensor working in the range of 17°C-181°C is first demonstrated by using a power-interrogation technique. Unlike most of the previous FBG-based sensors, here the proposed FBG is simultaneously utilized as both the sensing and the interrogating element.

Published in:

Photonics Technology Letters, IEEE  (Volume:25 ,  Issue: 3 )

Date of Publication:

Feb.1, 2013

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