We demonstrate the possible use of the Wigner-Ville transformation for describing ultrashort light pulses in both time and frequency and give support to the intuitive pictures used by experimentalists in the field. Two cases are considered: the effect of linear dispersion and self phase modulation. Various characteristics can be extracted from the Wigner-Ville distribution, e.g., time broadening, power spectrum broadening and reshaping, instantaneous frequency time variation.
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