Ultrahigh-resolution interrogation of a fiber Bragg grating sensor based on higher order four-wave mixing

The performance of a highly sensitive strain sensor based on nonlinear four-wave mixing (FWM) using a fiber Bragg grating (FBG) is investigated. The power change due to the wavelength shift induced by very small strain over the FBG is significantly magnified by a higher order FWM process. Strain sen...

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Bibliographic Details
Published in:Applied optics (2004) 2018-11, Vol.57 (31), p.9388
Main Authors: Ghosh, Chiranjit, Priye, Vishnu
Format: Article
Language:English
Subjects:
Four-wave mixing
Interrogation
Sensitivity
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Summary:The performance of a highly sensitive strain sensor based on nonlinear four-wave mixing (FWM) using a fiber Bragg grating (FBG) is investigated. The power change due to the wavelength shift induced by very small strain over the FBG is significantly magnified by a higher order FWM process. Strain sensitivity of 5.547  dBm/μϵ is achieved and minimum wavelength shift of 2.18×10   nm (which corresponds to a strain of 1.80×10   μϵ) is detected with uniform FBG, whereas in case of chirped FBG (CFBG) strain sensitivity of 0.3  dBm/μϵ with minimum detectable wavelength shift of 4×10   nm (which corresponds to a strain of 0.033  μϵ) is obtained.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.57.009388