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The optical propagation in the birefringence polarization-preserving fiber is modeled by the nonlinear Schrödinger equations system including the effect of four-wave mixing. A general trial equation method for complex coupled system is introduced to give the optical solitons and envelope solutions. These rich results show a varied of optical propagation patterns of the model. Under the concrete parameters, we give representations of these optical propagation patterns. Keywords: Optical soliton, Trial equation method, Envelope solution, Nonlinear Schrödinger’s equation