R. Boyed, Nonlinear Optics , third edition. Academic Press, 2009, 336-383.
 Y. Kivshar, G. P. Agrawal, Optical Solitons from fibers to photonic crystals, Academic Press, 2003.
 L. Feng, Z. J. Wong, R. M. Ma, Y. Wang and X. Zhang, Single-mode laser by parity-time symmetry breaking, Science, 346 (2014) 972.
 A. Zakeri and M. Hatami, Design of an ultra-fast all-optical dark soliton switch in a nonlinear directional coupler (NLDC) made of chalcogenide glasses, Applied Physicd D. 12 (2007) 591.
 G. P. Agrawal, Application of nonlinear fiber optics, Academic Press, 2001.
 J. S. Russell, British association reports, John Murray, London, 1984.
 T. Dauxois, M. Peyrard, Physics of Solitons, Cambridge University Press, 2006.
 A.C. Newell, Solitons in Mathematics and Physics, SIAM, Philadelphia, 1985.
 G. Agrawal, Nonlinear fiber optics, 4th Edition, Academic Press, 2007.
 L. Safaei, M. Hatami and M. Borhani Zarandi, Pt-Symmetric Nonlinear Directional Fiber Couplers with Gain and Loss for Ultrashort Optical Pulses, J Laser Opt Photonics, 4 (2017)155.
 J. C. Bender and S. Boettcher, Real spectra in non- Hermitian Hamiltonians having PT- symmetry, Phys. Rev. Lett. 80(1998) 5243.
 E. Rueter, K. G. Makris, R. El-Ganainy, D. N. Christodoulides, M. Segev and D. Kip, “Observation of parity-time symmetry in optics”, Nat. Phys. 6 (2010)192.
 S. Suchkov, A. Sukhorukov, J. Huang, S. Dmitriev, C. Lee andY. Kivshar, Nonlinear switching and solitons in PT-symmetric photonic systems, Laserand Photonics Rev. 10 (2015).
 L. Safaei, M. Hatami and M. B. Zarndi, Stability of Temporal Dark Soliton in PT-Symmetric Nonlinear Fiber Couplers in Normal Dispersion Regime, J Laser Opt Photonics, 3 (2016) 141.
 J. Yang, Nonlinear Wavesin Integrable and Nonintegrable Systems, SIAM Press, (2010) 119-162.
 E. Gromov, B. Malomed and V. Tyutin, Vector solitons in coupled nonlinear Schrodinger equations with spatial stimulated scattering and inhomogeneous dispersion, Communications in Nonlinear Science and Numerical Simulation, 54(2017).
 X. Chen and J. Yang, A direct perturbation theory for solitons of the derivative nonlinear Schrodinger equation and the modified nonlinear Schrodinger equation, Phys. Rev. E., 65 (2002) 066608.
 M. Hatami, Sh. Gharibnavaz, A. Keshavarz, Coupling Coefficient and Nonlinear Characteristics of Nanowire Directional Coupler, International conference on nanotechnology, Tbilisi, Georgia, (2017).