The characteristic of gap FBG and its application

Yuanhong Yang; Jun Hu; Xuejing Liu; Wei Jin

doi:10.1117/12.2183662

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1 July 2015 The characteristic of gap FBG and its application

Yuanhong Yang, Jun Hu, Xuejing Liu, Wei Jin

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Proceedings Volume 9655, Fifth Asia-Pacific Optical Sensors Conference; 96552U (2015) https://doi.org/10.1117/12.2183662
Event: Fifth Asia Pacific Optical Sensors Conference, 2015, Jeju, Korea, Republic of

Abstract

A gap fiber Bragg grating (g-FBG) is fabricated by cutting a uniform FBG in the middle to introduce a small air gap between the two sections. Numerical and experimental investigations show that the g-FBG has the characteristics of both a phase shifted FBG and a Fizeau interferometer. The influence of the air-gap shift longitudinally or transversely with respect to the fiber central axis and temperature to g-FBG's spectrums are investigated with numerical simulation and experiments, and the mathematic models are made. Based on g-FBG's different sensitivity to gap width and temperature, a micro-gap and temperature simultaneous measurement sensor was demonstrated. And a g-FBG based tunable fiber ring laser with a narrow line-width is demonstrated.

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Yuanhong Yang, Jun Hu, Xuejing Liu, and Wei Jin "The characteristic of gap FBG and its application", Proc. SPIE 9655, Fifth Asia-Pacific Optical Sensors Conference, 96552U (1 July 2015); https://doi.org/10.1117/12.2183662

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