In this paper

we investigate the temporal waveform

phase

time-bandwidth product of the short pulses（10GHz） before and after their propagations in dispersion-flattened fibers by using a novel method for measuring and analyzing their characteristics

compare them with the linear propagation characteristics of the hyperbolic secant and Gaussian pulses resulted from numerical calculations and evaluate more exactly their temporal waveform and frequency chirp

which further verifies the reliability and accuracy of the new method for the second-harmonic frequency-resolved optical gating.