It is the key of realizing high speed, large capacity fiber information transmission that achieve ultrashort
optical pulse by optical pulse compression. At present, the compression method that is achieving parabolic
pulse with linear chirp and compensating the linear chirp is paid more attention. Based on the two schemes for
the parabolic pulse with linear chirp by the normal dispersion decreasing fiber or the fiber amplifier with a
normal dispersion, more study on the characteristics of the parabolic pulse with linear chirp in the different
dispersion decreasing profiles (such as cosine, Gaussian, linear, exponential and hyperbolic) is showed; the
results show that, for different dispersion decreasing profiles, the good linear chirp and parabolic shapes that
are good for pulse compression can be generated. Moreover, a novel scheme for the parabolic pulse, which is
achieved by a dispersion decreasing fiber amplifier with a normal dispersion, is presented. Numerical
simulations show that, compared with the parabolic pulses generated in the normal dispersion decreasing fiber
or the fiber amplifier, the parabolic pulse generated by the novel scheme has the better linear chirp and the
more pulse energy; the gain has an obviously effect on the intensity and quality of the linear chirp, which is that
the output pulse has a smaller pulse width and higher pulse power after the chirp is compensated.
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