Spectrotemporal measurement of picosecond pulses propagating in nonlinear single-mode fibers.
The combined effects of positive group-velocity dispersion, self-phase modulation, and stimulated Raman scattering experienced by 85-psec pulses propagating along a 960-m-long single-mode fiber are experimentally studied. The use of a spectrograph followed by a streak camera provides measurements in the spectrotemporal domain of the induced frequency modulation of a pump pulse. As a result, optical wave breaking, depletion of the leading edge with symmetrical spectral broadening, and complex instantaneous frequency structures are observed when the peak power of the input pulse is gradually increased to 435 W. The experimental method is also adapted for single-shot event analysis.
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JP
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