Abstract
We propose an improved method to compress high-order femtosecond solitons, which combines effects of negative third-order dispersion and Raman self-scattering in the fibers. Based on the results of the numerical simulations, we can conclude that given a dispersion decreasing parameter, the higher the soliton order is, the shorter the optimum fiber length is needed, and the greater the relative peak intensity is. For a given initial soliton width and a given dispersion decreasing parameter, there exist both an optimum dispersion decreasing fiber (DDF) length and an optimum value of the negative third-order dispersion coefficient of the DDF at which the enhancement in higher-order soliton compression is maximum. We have also studied the dependence of the compression enhancement on both the initial soliton width and the dispersion decreasing parameter and found for a certain input pulse, the relative peak intensity will increase with the dispersion decreasing parameter. It is also shown that both Gaussian pulses and solitons are favorable for the highest quality compression in fibers with slowly decreasing dispersion.
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