Abstract
A coherent cw-pump launched into a single mode optical fiber cavity generates backward propagating Stokes pulses, called dissipative three- wave Brillouin solitons, by stimulated Brillouin scattering (SBS) on the electrostrictively created hypersound waves (tens of GHz) guided in the fiber core. Due to the transverse intensity gradient of the optical field guided in the fiber, these pulses may also electrostrictively excite lower frequency sound waves (5 MHz to 1 GHZ) transversally propagating in the fiber cladding. We show that transverse resonances due to this cladding Brillouin scattering (CBS) yield a very rich four-wave dynamics in Brillouin fiber ring lasers; pulses become often chaotic, but within finite frequency ranges there are stable trains of Brillouin solitons either spread or compressed (by a factor 2). A four-wave model is developed and the dynamics analysed in a stability map. We obtain both numerically and experimentally trains of pulses of peak intensity up to 14 times higher than the cw launched pump.
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