Sensitivity Analysis of Sidelobes of the Lowest Order Cladding Mode of Long Period Fiber Gratings at Turn Around Point

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

doi:10.3390/s22082965

Sensitivity Analysis of Sidelobes of the Lowest Order Cladding Mode of Long Period Fiber Gratings at Turn Around Point

Sensors (Basel). 2022 Apr 12;22(8):2965. doi: 10.3390/s22082965.

Authors

Tanoy Kumar Dey¹, Sara Tombelli², Arpan Roy¹, Palas Biswas¹, Ambra Giannetti², Nandini Basumallick¹, Francesco Baldini², Somnath Bandyopadhyay¹, Cosimo Trono²

Affiliations

¹ Central Glass and Ceramic Research Institute, CSIR-CGCRI, 196 Raja S C Mullick Road, Kolkata 700032, India.
² Institute of Applied Physics "Nello Carrara", CNR-IFAC, Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy.

Abstract

A new methodology to enhance the sensitivity of a long period fiber grating sensor (LPFG) at the Turn Around Point (TAP) is here presented. The LPFG sensor has been fabricated by etching the fiber up to 20.4 µm, until the sidelobes of dispersed LP_0,2 cladding mode appeared near TAP in aqueous medium. The dual peak sensitivity of the sidelobes was found to be 16,044 nm/SRIU (surrounding refractive index units) in the RI range from 1.333 to 1.3335.

Keywords: cladding mode; etching; long period fiber grating; sensitivity enhancement; sidelobes.