Discrete multipole dark solitons in saturable nonlinearity media with parity-time symmetric lattices
School of Electro-mechanical Engineering, Guangdong University of Technology, 510006, Guangzhou, China
2 School of Information Engineering, Guangdong University of Technology, 510006, Guangzhou, China
3 Department of Physics, Guangdong university of Education, 510303, Guangzhou, China
Accepted: 13 January 2017
Published online: 16 February 2017
We investigate numerically the existence and stability of discrete multipole dark solitons in saturable nonlinearity media with parity-time () symmetric lattices. The dipole and triple solitons share the same existence domain associated with the propagation constant, gain-loss coefficient and the degree of saturable nonlinearity. However, the solitons stably propagate in a different area of the aforementioned three parameters. The beam power monotonously increases with the increase of propagation constant and the saturable degree, but gently decreases with the gain-loss coefficient. Moreover, the power of the triple solitons is higher than that of dipole solitons under the same conditions.
© Società Italiana di Fisica and Springer-Verlag Berlin Heidelberg, 2017