The influence of forward Raman amplification on Brillouin scattering signal of pulse light was investigated in
experiments, including the spontaneous Brillouin scattering and the stimulated Brillouin scattering (SBS). The results of
experiments show that the spontaneous Brillouin scattering is amplified by fiber Raman amplifier and fiber Brillouin
amplifier, consequently the gain is high. For the amplification of SBS signal, it is only amplified by Raman amplifier in
the fiber. As the Raman pump power reaches 600mW, it causes multi-order Brillouin scattering, and then the gain of the
first order Stokes SBS starts to saturate and decline.
The theory of fiber Brillouin amplifier is investigated by numerical solution combinating interpolation method and
Runge-Kutta method. Meanwhile, the most complete characterization and comparison of FBAs for pump power, initial
signal power and fiber length is obtained. Through the analysis and comparison, the results show that the amplification
efficiency can reach 90% based on the SBS and the most of the power transfer occurs within the first 20% of the fiber
length. The output signal power is linear increased with increasing of the initial pump and initial signal, respectively. The
high-gain Brillouin amplifier can be obtained when then fiber length is about 26km.
The influence of the fiber length and input power on pulse light stimulated Brillouin scattering effect was investigated.
Laser with the wavelength 1550nm emitted a continuous optical input electro-optic modulator, and then is modulated
into pulsed light. The pulsed signal is provided by the signal generator, pulse width 200ns, repetition frequency 2 KHz.
The results show that the threshold of pulse light stimulated Brillouin scattering is 3.1dBm with the 25 Km single-mode
optical fiber, and the light intensity of stimulated Brillouin scattering starts to grow slowly when the pump power is
beyond 8.1dBm. It can be seen that Brillouin Stokes power increases with the growth of fiber length, but when the fiber
is longer than 31km, the Brillouin Stokes power reaches saturation.
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