Controlled linearly chirped similaritons in inhomogeneous birefringent optical fibers

Abstract

By similarity transformation, optical similaritons in a nonlinear birefringent optical fiber are investigated within the framework of two coupled nonlinear Schrödinger equations with space-modulated self- and cross-phase modulation nonlinearities, group velocity dispersion, external electro-optic phase modulation, and gain/loss. We find that the birefringent nonlinear medium with spatial parameter variations supports the existence of linearly chirped similariton structures of the W-shaped-dipole and bright-dipole types. These important results indicate that in addition to the usual single-humped localized waves such as bright-bright and dark-dark type waveforms, multihump chirped similaritons can also exist in the inhomogeneous birefringent fiber in the presence of all physical effects. The similariton parameters such as the amplitude, width, phase, and inverse group velocity are found to be dependent on certain controllable fiber parameters, thus enabling us to manage their intensity and consequently their subsequent dynamical evolution. Finally, we investigate the transmission of similaritons for different choices of material parameters.