Photonic crystal fibers (PCFs) have attracted much attention due to their unique features that are not available with conventional single-mode fibers (CSMFs). The ability to design PCFs with controllable dispersion properties and small effective area enhances the nonlinear properties in these fibers. Thus PCFs are expected to be suitable for optical soliton transmission links where the group velocity dispersion (GVD) of the fiber link balances its optical nonlinearity effect. This thesis addresses optical soliton transmission in PCFs. The effect of fiber parameters such as fiber loss, GVD, effective area is investigated for Ist-order and higher- order soliton transmission. The results are compared with those related to CSMFs designed with GVD=17ps/(nm.km) and effective area=80um2. The results can be used as a guideline to achieve soliton transmission over PCF using lower input peak power compared with a standard CSMF. Simulation results are obtained by solving the nonlinear Schrodinger (NLS) equation, which describes pulse propagation along the fiber, using split- step Fourier method in the MATLAB 7 environmental. The simulation takes into account different fiber parameters along with input pulse parameters. Simulation results are reported for both Gaussian and hyperbolic secant input pulses. The simulation results are compared with published experimental data reported for 10 Gb/s penalty- free dispersion managed soliton transmission over a low loss 100 km PCF. The results indicate clearly that the theoretical results reported are in acceptable agreement with the experimental published data.