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Analysis of the Lowest Order Cladding Mode of Long Period Fiber Gratings Near Turn Around Point

Tanoy Kumar Dey, Sara Tombelli, Palas Biswas, Ambra Giannetti, Nandini Basumallick, Francesco Baldini, Somnath Bandyopadhyay, Cosimo Trono

Journal of Lightwave Technology（2021）

Cited 17|Views21
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Abstract
A long period fiber grating (LPFG) sensor has been fabricated, after theoretical analysis, obtaining the maximum enhancement of the evanescent field working with the lowest order cladding mode (LP0,2 cladding mode) near turn around point. Both the wavelengths of the dual peak resonance and the coupling conditions of the mode have been analyzed in detail. A flow cell has been fabricated to characterize the sensor in term of surrounding refractive index (SRI) sensitivity. The sensitivity of the sensor resulted to be similar to 8751 nm/SRIU, with a resolution in the order of 10(-5), within the SRI range of 1.333 to 1.3335.
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Key words
Fiber gratings,Sensitivity,Etching,Optical fiber dispersion,Couplings,Gratings,Optical fiber sensors,Long period fiber gratings,turn around point,evanescent field,etching
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