Abstract
Raman amplification is considered as an effective approach to prolong the sensing distance based on Brillouin optical time domain reflectometer (BOTDR) technology. We theoretically simulate the characteristics of BOTDR with Raman amplification by using the principle of spontaneous Brillouin scattering and the coupled mode theory. The simulation results indicate that Raman amplification can effectively increase the BOTDR sensing distance. The optimal incident Raman pump power is 480 mW for first-order Raman amplification, while the optimal incident primary pump and secondary pump powers are 1200 mW and 5 mW respectively for dual-order Raman amplification. Compared with the first-order Raman amplification, the dual-order Raman amplification method has a flatter probe power distribution, and indirectly optimize the signal-to-noise ratio of the received Stokes light.
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