Experiments that produced 100-fsec pulses by a single-pass Raman amplification process did not lead to the expected self-frequency shift induced by intrapulse Raman scattering. We show that under conditions in which a Stokes pulse continues to receive frequency-dependent gain from a pump, a balance can be achieved between the two competing processes. Hence the progressive self-frequency shift of a soliton along a fiber can be suppressed.
© 1988 Optical Society of America
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