Single mode fibers are being installed in nearly all communication lines. For the purpose of maintenance and observation of line, data of the installed fiber condition is needed. Distributed temperature sensing for single mode fiber is expected in this field. Special wavelength light sources are necessary to measure the temperature distribution by Raman ratiomelry because of avoiding the single mode fiber's cut-off wavelength Distributed temperature sensing of the single mode fiber is perceived using fiber Raman laser. Fiber Raman laser is pumped by the LD pumped solid state laser source. l400nm pulse light is coupled into a single mode fiber, and the 1320 Anti-Stokes and l500nm Stokes light are detected to calculate the temperature. Temperature accuracy is with the average time of 3mm and maximum measurable range is 3 km.

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