Abstract
Parabolic pulse generation by Raman amplification has been numerically and experimentally investigated around 1550 nm using a standard normally dispersive nonzero dispersion shifted fiber (NZ-DSF). The output pulses, characterized in intensity and phase using frequency-resolved optical gating, exhibit parabolic features in good agreement with numerical simulations based on two coupled extended nonlinear Schro/spl uml/dinger equations. The influence of the energy and duration of the input pulse has been studied. The ability of the parabolic pulses to propagate self-similarly during additional propagation over 800 m of NZ-DSF has also been demonstrated.
Highlights
P ARABOLIC pulses in normally dispersive optical fibers with gain have generated considerable interest since their first experimental demonstration [1]
Theoretical studies [2], [3] based on the self-similarity analysis of the nonlinear Schrödinger equation (NLSE) with constant gain, have revealed that the interplay of normal dispersion, nonlinearity, and gain produces a linearly chirped pulse with a parabolic intensity profile which resists the deleterious effects of optical wave-breaking [4]
Experimental studies of parabolic pulse generation have been restricted to fiber amplifiers where the gain and normal group velocity dispersion (GVD) are associated with the addition of dopants, such as Erbium [1] or Ytterbium [5]–[7], in the fiber core
Summary
P ARABOLIC pulses in normally dispersive optical fibers with gain have generated considerable interest since their first experimental demonstration [1]. Experimental studies of parabolic pulse generation have been restricted to fiber amplifiers where the gain and normal group velocity dispersion (GVD) are associated with the addition of dopants, such as Erbium [1] or Ytterbium [5]–[7], in the fiber core. It should be noted that the fiber gain mechanism that is used for the parabolic pulse generation need not necessarily be based on a resonant amplification process, and this opens up the possibility to consider the use of Raman amplifiers to provide gain where no conventional amplifiers are possible.
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