Temperature Tuning Properties of π Phase-Shifted Fiber Bragg Gratings

Junjie, 孙俊杰 Sun; Zefeng, 王泽锋 Wang; Meng, 王蒙 Wang; Xiaoming, 奚小明 Xi; Jinbao, 陈金宝 Chen

doi:10.3788/aos201737.1006004

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“…The resonance wavelength of an FBG is expressed as (16) 2 eff n λ Λ = , where Λ is the grating period and n eff is the effective index. Any change in either of these two parameters will cause the resonant wavelength to change.…”

Section: Resultsmentioning

confidence: 99%

“…(9)(10)(11) The transmission peak undergoes a certain amount of shift with a change in the external environment, which is utilized to measure temperature, strain, and magnetic field. (12)(13)(14)(15)(16) Because of its very narrow transmission peak, a PS-FBG has a high resolution. To improve the sensing performance, the diameter of a PS-FBG needs to be decreased to expose the evanescent field to the surrounding environment.…”

Section: Introductionmentioning

confidence: 99%

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Sensing Properties of Thinned Phase-shifted Fiber Bragg Gratings

Yao¹,

Pu²,

Li³

et al. 2020

Sensors and Materials

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A π phase-shifted fiber Bragg grating (PS-FBG) with reduced diameter is proposed for sensing applications. To achieve high sensitivity, etching and side polishing are used to decrease the diameter of the PS-FBG. The transmission peak undergoes a clear redshift with refractive index increase, and the sensitivity is 3815 pm/RIU when the surrounding refractive index ranges from 1.41514 to 1.45450. The structure is also sensitive to ambient temperature from 25 to 55 °C. Experimental results show that the temperature sensitivities are 12.26, 12.54, and 19.51 pm/℃ for PS-FBGs with diameters of 125, 87, and 52 μm, respectively. The effect of the pump power on the sensing performance is also studied.

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Section: Resultsmentioning

confidence: 99%