We present a solitary solution of the three-wave nonlinear partial differential equation ͑PDE͒ modelgoverning resonant space-time stimulated Brillouin or Raman backscattering-in the presence of a cw pump and dissipative material and Stokes waves. The study is motivated by pulse formation in optical fiber experiments. As a result of the instability any initial bounded Stokes signal is amplified and evolves to a subluminous backscattered Stokes pulse whose shape and velocity are uniquely determined by the damping coefficients and the cw-pump level. This asymptotically stable solitary three-wave structure is an attractor for any initial conditions in a compact support, in contrast to the known superluminous dissipative soliton solution which calls for an unbounded support. The linear asymptotic theory based on the Kolmogorov-Petrovskii-Piskunov assertion allows us to determine analytically the wave-front slope and the subluminous velocity, which are in remarkable agreement with the numerical computation of the nonlinear PDE model when the dynamics attains the asymptotic steady regime. ͓S1063-651X͑97͒13201-9͔
International audienceWe experimentally and theoretically demonstrate the SOA gain recovery time dependency on the probe signal wavelength and power, when injecting a continuous wave (CW) high power assist light in the device. In our study, pump, probe and assist light waves are all co-propagative. Experimental and numerical results show that the gain recovery time is significantly reduced over a wideband of probe wavelengths, due to the assist light use. The reduction is more pronounced for low probe powers. A theoretical evaluation of the transparency wavelength dependency on both the probe wavelength and power is presented. Then, a study on assist light power effects on the SOA dynamics as well as pump and probe wavelengths effects on SOA gain recovery time is performed
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