A novel multimode fiber for distributed temperature sensing based on anti-stokes Raman scattering

In order to study the influence of temperature sensing fiber on distributed temperature sensing, a specific experimental setup was constructed. A novel multimode fiber has been fabricated by plasma chemical vapor deposition process. Relative index profile and schematic cross-section of the novel multimode fiber were available. Higher content of Germanium doping in the fiber core is propitious to increase numerical aperture, which will enhance the acquisition capability of backscattering light signal. After hydrogen ageing, the signal attenuation coefficient of sample fiber is 0.29 ~ 0.35 dB/km or less in the wavelength range of 1450 to 1650 nm, which is measured by cut-back method. In the experimental system, the backscattering intensity of our novel multimode fiber is 2 ~ 3 times higher than that of conventional multimode fiber.