An optical soliton pulse can be effectively used as an information-carrying signal in a nonlinear optical fiber medium. We propose an analytical model for phase-sensitive switching by the use of two mutually orthogonal polarized Gaussian pulses. To realize it we consider a Gaussian pulse first propagating through an electro-optic modulator. The orthogonal components of the pulse are introduced into the optical fiber. By controlling the applied voltage across the modulator we can change the phase relation between the components. By this method, switching at a very long distance can be implemented in the optical fiber.