Drastic enhancement of Brillouin Stokes signal using pulsed pump and low-power erbium-doped fiber amplifier

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Brillouin scattering properties of optical fibers should be precisely investigated in advance for their applications to distributed strain/temperature sensing. Especially when the fibers are short, high-loss, or multi-mode, as in the case of polymer optical fibers, high-power pump is required, but commercially-available high-power lasers or optical amplifiers are expensive. In this paper, we propose a new method to enhance Brillouin scattering signals with a relatively low-cost low-power erbium-doped fiber amplifier by using pulsed pump light. When pulsed pump light with average optical power of 20 mW, duty ratio of 20%, and pulse period of 2 μs, was injected into a silica single-mode fiber, the Brillouin signal was enhanced by 25 dB compared to that with continuous-wave pump light having the same average power.

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