Lida Safaei - Faculty of Science, Department of Physics, Yazd University, Yazd, Iran
Mahmood Borhani Zarandi - Faculty of Science, Department of Physics, Yazd University, Yazd, Iran
Mohsen Hatami - Faculty of Physics, Shiraz University of Technology, Shiraz, Iran

In this paper, we study the higher-order nonlinear Schrdinger (HNLS)equations for a directional ber optic coupler with the third-order dispersion(TOD), self-steeping (SS) and stimulated Raman scattering (SRS) effects and gainin one waveguide and loss in the other. We have reduced the system equations toan uncoupled HNLS equation which has bright and dark soliton solutions. It isshown that the Hamiltonian for this equation has a PT - Symmetric form.Furthermore the equilibrium points are found and the discussion about theirstability is presented.

Fibers, Nonlinear optics, Directional Coupler, Photonic, Nano Thechnology, Ultrashort Optical Pulses, PT -Symmetry