The forward and backward cascaded stimulated Brillouin scattering (SBS) in the backward pumped S band distributed G652 fiber Raman amplifier have been researched, pumped by the tunable power 1428nm fiber Raman laser and signal source is a tunable narrow spectral bandwidth (<100MHz)ECL. The forward SBS does not obey the common theory, that only weaken backward-SBS lines existed, according to conservation of energy and momentum and wave vector selected rule. Because the wave-guide character weaken the wave vector rule, the forward transmit sound wave-guide forward Brillouin scattering lines are generated and amplified in S band G652 FRA. Forward SBS that is amplified phenomena of transmit sound wave Brillouin scattering in the G652 FRA, during pump power is larger than the threshold value of SBS in a S band G652 FRA. Two-order SBS in the Stokes region is observed during the pump power is increased. When the FRA pump power is further increased, Cascaded SBS lines and comb profile are observed.
The cascaded forward stimulated Brillouin scattering (SBS) in the S band distributed G652 fiber Raman amplifier forward pumped and backward pumped by the tunable power fiber laser and signal source is a tunable narrow spectral bandwidth(<100MHz)ECL have been studied. Forward SBS does not obey the common theory, that only weaken backward-SBS lines existed, according to conservation of energy and momentum and wave vector selected rule. Because the wave-guide character weaken the wave vector rule. The forward transmit sound wave-guide Brillouin scattering lines are generated and amplified in FRA. Forward SBS that is amplified phenomena of transmit sound wave Brillouin scattering in the FRA, during pump power is larger than the threshold value of SBS in a S band G652 FRA. The 2 orders Stokes forward Brillouin lines are present during forward pump power of FRA is 920mW, the pump power of BP line is 7.7dBm and the FRA gain is 15.05dB, the power of first order Brillouin lines is smaller than the second Brillouin scattering line. When pump power is further increased, cascaded SBS lines and comb profile are observed. The even order SBS lines is stronger than odd order SBS lines, The odd order SBS lines are named Brillouin- Rayleigh scattering lines.
5kmDCF-50kmG652 fiber dispersion compensation FRA pumped by three-wavelength Raman fiber laser has been researched. Dispersion and dispersion slope can be compensated in the dispersion compensation FRA simultaneously. Cascaded pump fiber laser is an all fiber technology, and high output power above 3W can be achieved. The Raman fiber lasers which operating at wavelengths of 1428,1455 and 1466nm have been used to simultaneously pump dispersion compensation fiber Raman amplifier. Simulated annealing algorithm is adopted to give automatic pump power configuration in multiwave backward-pumped dispersion compensation FRA. Simulated annealing algorithm imitates physical annealing process in order to seek the most optimal key. We studied the dispersion compensation FRA with the pump power configuration of optimal design in experiment, and the spectrums of gain and noise figure (NF) have been measured. When pump power is 1250mw and signal power is 0dBm,we get 55nm flat-gain bandwidth, and noise figure is less than -0.93dB, while the gain flatness is less than 3dB and gain is more than 21.32dB;when pump power is 1500mw,we get 45nm flat-gain bandwidth, and noise figure is less than -1.79dB,while the gain flatness is less than 3dB and gain is more than 27.77dB.
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