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

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, whi...

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Bibliographic Details
Published in:IEEE photonics technology letters 2013-02, Vol.25 (3), p.231-233
Main Authors: Lunlun Xian, Peng Wang, Ogusu, Kazuhiko, Hongpu Li
Format: Article
Language:English
Subjects:
Cladding-mode coupling
Couplings
fiber Bragg grating
Fiber gratings
Optical fiber sensors
power-interrogated temperature sensor
Temperature measurement
Temperature sensors
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Summary: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.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2012.2235062