In this paper, we investigate the propagation characteristics of femtosecond pulses using the proposed silicon nanowire embedded photonic crystal fiber (SN-PCF). The pulse propagation in SN-PCF is governed by the well known higher order nonlinear Schrödinger (HNLS) equation. Using variational analysis, we study the propagation characteristics of an hyperbolic secant pulse, namely, pulse amplitude, width, chirp and phase.