Irradiation effect on strain sensitivity coefficient of strain sensing fiber Bragg gratings

doi:10.1088/1674-1056/23/1/014206

Abstract The effect of irradiation on the strain sensitivity coefficient of strain sensing fiber Bragg gratings (FBGs) has been investigated through experiments. FBGs were fabricated in single mode fibers with 3 mol% Ge-concentration in the core and with a H₂-loading treatment. In experiments, the FBGs were subjected to γ-radiation exposures using a Co⁶⁰ source at a dose-rate of 25 Gy/min up to a total dose of 10.5 kGy. The GeO defect in fiber absorbs photons to form a GeE’ defect; the interaction with H₂ is a probable reason for the γ-radiation sensitivity of gratings written in hydrogen loaded fibres. The effect mechanism of radiation on the strain sensitivity coefficient is similar to that of radiation on the temperature sensitivity coefficient. Radiation affects the effective index n_eff, which results in the change of the thermo-optic coefficient and the strain-optic coefficient. Irradiation can change the strain sensitivity coefficient of FBGs by 1.48%–2.71%, as well as changing the Bragg wavelength shift (BWS) by 22 pm–25 pm under a total dose of 10.5 kGy. Our research demonstrates that the effect of irradiation on the strain sensitivity coefficient of FBG is small and that strain sensing FBGs can work well in the radiation environment.

Keywords: fiber Bragg grating irradiation effect strain sensitivity coefficient

Received: 17 April 2013
Revised: 03 June 2013
Accepted manuscript online:

PACS:	42.81.Cn	(Fiber testing and measurement of fiber parameters)
	42.82.Et	(Waveguides, couplers, and arrays)
	42.88.+h	(Environmental and radiation effects on optical elements, devices, and systems)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61007040).

Corresponding Authors: Lin Song
E-mail: linsong@aspe.buaa.edu.cn

Cite this article:

Jin Jing (金靖), Lin Song (林松), Song Ning-Fang (宋凝芳) Irradiation effect on strain sensitivity coefficient of strain sensing fiber Bragg gratings 2014 Chin. Phys. B 23 014206

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Irradiation effect on strain sensitivity coefficient of strain sensing fiber Bragg gratings

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