Modeling of Spontaneous Raman Scattering in silica light guides for Distributed Temperature Sensing

Silica optical fibers are used as sensors in the Distributed Temperature Sensing (DTS) systems today. They are durable and immune to electromagnetic interferences, and it results in their reliability and the potential of application in rough industrial environments. The temperature profile along the fiber is obtained by applying the Optical Time Domain Reflectometry (OTDR). There is alternative method using Optical Frequency Domain Reflectometry (OFDR). Both methods allow estimating the temperature and the distance of hot spots. This paper presents simulation models of OTDR and OFDR for the single-ended DTS system with pulse and continuous laser light generation.