title: Characteristics of transverse-stress-induced phase change through a distinct dual-mode fiber in a Sagnac loop.
abstract: We report here the experimental realization of a fiber-optic transverse-stress sensor devised by a dual-mode optical-fiber segment in a standard Sagnac interferometer loop. The intermodal interference of the LP01 and LP02 modes of the dual-mode fiber (DMF) configuration is analyzed theoretically in the platform of polarization transmittance of the Sagnac loop in implementing the theoretical model. Several experimental measurements for various conditions of applied birefringence are studied at length and the results are compared with those estimated theoretically toward configuring a stress-measuring device. The study provides an understanding of the underlying physics of the working of DMF interference in a Sagnac configuration.
authors.affiliation: Department of Physics and Meteorology, Indian Institute of Technology Kharagpur, Kharagpur 721302, India.
authors.forename: Saba N
authors.initials: SN
authors.lastname: Khan
authors.forename: Sudip Kr
authors.initials: SK
authors.lastname: Chatterjee
authors.forename: Kajal
authors.initials: K
authors.lastname: Mondal
authors.forename: Partha Roy
authors.initials: PR
authors.lastname: Chaudhuri