Spectral theory of stimulated light scattering by a broadband pump

Wang Shi-He, Ren Li-Yong, Liu Yu +1 more

We analyse the stimulated Brillouin scattering （SBS） slow light using double broadband pumps in a single mode fiber. A new SBS gain spectrum tailoring method is proposed using two Gaussian-shaped broadband pumps with different powers and spectral widths, and the central frequency interval of them is carefully set at two Brillouin frequency shifts to make sure that the gain of one pump has the same center with the loss of the other. The top of the gain spectrum of the strong pump beam can be counteracted by the loss spectrum of the weak pump beam to construct a flat top gain spectrum. We give the optimized conditions of the laser powers and spectral widths between two broadband pumps to obtain a flat gain. Distortions of signal pulse under this flat top gain are studied and compared with that obtained using a single broadband pump. We find that the flat top gain profile can effectively reduce the pulse distortions.

Boris Ya Zel'dovich, Nikolai F. Pilipetsky, Vladimir V. Shkunov

B. Livshitz, V. N. Tsikunov

Daniel J. Gauthier, Zhaoming Zhu, Andrew M. C. Dawes +2 more

We describe how to optimize slow-light via stimulated Brillouin scattering in a room temperature optical fiber that is pumped with a spectrally broadened laser. Our recent experimental results on broadband SBS slow-light will be discussed.

Partha Sarathi Gupta, B. K. Mohanty

Liyong Ren, Yasuo Tomita

We describe a theoretical analysis of broadband stimulated Brillouin scattering (SBS) slow light delay in a single-mode optical fiber. A flat-top broadband SBS gain spectrum can be constructed by use of two broadband pump beams. We propose two schemes of the double broadband pumping. We show that, for each scheme, the spectral profile of the total SBS gain becomes wide and symmetric when the appropriate architecture of the two broadband pump beams is adopted accordingly. Our schemes can effectively reduce or even eliminate the broadening of signal pulse. It provides the use of shorter signal pulses for slow light control.