Effect of radiative loss on pulses in periodically inhomogeneous birefringent optical fibers

The evolution of coupled pulses in a nonlinear birefringent optical fiber with a periodic modulation of the group velocity birefringence is considered. By using a trial function consisting of coupled pulses with variable parameters in the two modes in an averaged Lagrangian, ordinary differential equations for the pulse parameters are obtained. Furthermore, by considering linearized equations the effect of the dispersive radiation shed as the pulses evolve is calculated and the ordinary differential equations are augmented to include mass and momentum loss due to dispersive radiation. It is found that the inclusion of this dispersive radiation is necessary in order to obtain good agreement with full numerical solutions of the governing equations.

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