In this paper, the chirped- free optical pulses compression through propagating in silica ââ?¬â?? index guiding\nphotonic crystal fibers will be studied. The results show that the Raman Effect can enhances the quality of\ncompressed pulses and also the positive third-order dispersion (TOD) can be considered as the main reason\nin limiting the optical pulses compression. We will show that, the combined effects of the Raman\nscattering and negative TODs can causes generating much further compressed pulses in comparison with\napplying the only Raman effect or combination of that with the positive TODs. In this paper, We also\nnumerically present a novel technique to solve the wave propagation equation, which is known as the\nconcrete algorithms of split-step fourier method and fourth order Runge-Kutta (RK4) method. This method\nhas a higher accuracy, although the computational time is longer because the number of calculation steps is\nchosen very large.
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