Mathematical model of distributed temperature sensor based on spontaneous Raman scattering is described in this paper. The concept uses Stokes and anti-Stokes scattered signals as reference and detection signals respectively. Model is completed by experimental results coming from setup of 200 m G.652 sensing fiber tested in temperatures 3°C, 15°C, 23 °C and 30°C and 2500 m reference fiber preserved in 22°C. Parameters of the scattered signal source in used setup configuration allow to achieve distributed temperature profile with spatial resolution up to 50 m.
Numerical modelling of the Raman polarization attraction and amplification process in the telecommunication band
around 1550 nm is presented. Possibility of achieving both polarization pulling and amplification in Polarization
Division Multiplexing transmission system by exploiting the polarization dependence of stimulated Raman scattering is
investigated. Analysis is made both for co- and counter- propagation configuration with standard and highly nonlinear
fiber. Different input pump polarization states are tested for best polarization pulling effectiveness.