The Soliton-Effect Picosecond Pulse Compression In Conventional Fibers And Dispertion Decreasing Fibers

The pulse compressors based on the nonlinear effects in optical fibers can be classified into two broad categories, referred to here as fiber-grating compressors and soliton-effect compressors. The soliton-effect compressors consist of only a piece of fiber whose length is suitably chosen. The input pulse propagates in the anomalous-dispersion regime of the fiber and is compressed through an interplay between SPM and GVD. The compression is due to an initial narrowing phase through which all higher-order solitons go before the initial shape is restored after one soliton period .In this paper, by analyzing the change of compression factor, optimum Fiber length, peak power of compressed pulse and compression quality, the soliton-effect picosecond pulse compression is studied by simulating the transmission of picosecond pulse in conventional fibers and dispersion decreasing fibers numerically with the method of split-step Fourier. Jn conventional fibers, the effect of initial chirp and fiber loss on the quality of soliton-effect picsecond pulse compression are studied respectively. We have studied the soliton-effect compression in fibers with slowly decreasing dispersion in two different mathematic models. Given input pulse, we found that the highest compression ratio corresponds to an optimal decrement velocity of the fiber dispersion. At last, the effect of initial chirp on the quality of pulse compression is also studied by analyzing the change of parameters introduced above.