Indian Journal of Science and Technology

Abstract

Objective: In this paper, the author has used the coherent anti-stokes Raman scattering and the time correlated single photon count technique to locate the fault position and fault in fiber optic communication cable. Method/Statistical Analysis: The coherent anti-stokes Raman scattering where used to measure the single photon count and the counts are correlated with time to measure the position of the fault in fiber optical cable. The proposed method is experimented on a 4 meter length fiber optic cable which is under test. The experiment is performed by considering prefixed faults at different length of the fiber optic cable under test. The author has done one of its kinds of experimentation to measure the faults and fault position in the fiber optical cables, lay underneath the ground. Findings: The experimented results have shown a clear cut edge with the technique that the photon count rate is decreased at the fault position of the optical fiber cable under test. The sharp increase of counts after the fault position and sharp decrease of counts before the fault position strongly supports the proposed method for fault finding in fiber optic cable. Application/Improvement: The proposed method is much more accurate in finding faults which is not possible by the pervious technology or devices. The proposed method can be applied to lengthy fiber optic cables by selecting high range pump lasers and advanced filters.
Keywords: Coherent Raman Scatterings, Detection Efficiency, Photon Count Rate, Superconducting Nanowire Single –Photon Detector ,.