Abstract:In this paper, the relationship between the frequency shift of stokes in a single mode fiber (SMF) and the operating environment temperature was deduced theoretically, which are deduced from the wave-vector relations between acoustic phonons, pump photons and stokes photons in SMF. Then an experimental structure of a multi-wavelength erbium doped fiber laser based on the stimulated Brillouin scattering effect was designed. The curve between the Stokes optical frequency shift and the external temperature was experimentally measured. The experimental results showed that: there is a good linear relationship between the Stokes optical frequency drift and the external temperature, and with the increasing of temperature, the frequency shift coefficient of the high-order Stokes light shift is becoming higher than the low-order Stokes light.