Acta Photonica Sinica ›› 2019, Vol. 48 ›› Issue (10): 1048006-1048006.doi: 10.3788/gzxb20194810.1048006

• Special Issue on Optical Soliton • Previous Articles    

Properties of Multipolar Bright Solitons in Non-local Nonlinear Coupling Medium

FANG Ping-ping, JIN Xin-wei, LIN Ji   

  1. Department of Physics, Zhejiang Normal University, Jinhua, Zhejiang 321004, China
  • Received:2019-09-16 Online:2019-10-25 Published:2019-10-10
  • Contact: 2019-10-10 E-mail:linji@zjnu.edu.cn
  • Supported by:

    The National Natural Science Foundation of China (No.11675146)

Abstract:

The existence conditions and stable propagation of multipole bright solitons in the one dimensional nonlocal nonlinear couple are reported. By means of Newton iterative method, the dipolar and tripolar bright solitons are obtained. Because the attraction of solitons is larger than their repellant due to the strong nonlocal response, the propagation of the dipolar soliton is unstable, and two solitons attract each other and then merge into one soliton. With the decrease of the nonlocal parameters, the propagations of the dipolar solitons are stable when the balance of the nonlinear effect and diffraction effect is achieving. On the other hand, with the decrease of the propagation constant, the amplitude of solitons increases and the beamwidth is changed to be narrow, the propagation of solitons is stable. For tripolar bright solitons, the coupled tripole solitons can not propagate steadily when the nonlocal parameters are small. After a distance of propagation, the tripole solitons collide and merge into dipolar solitons, finally the dipolar solitons merge into an oscillatory beam. With the nonlocal parameters increasing, the propagation of the tripolar bright solitons come to be more stable. Taking the propagation constant negative and decreasing its absolute value, the amplitudes of solitons increase, the beamwidths decrease, and the propagation stability of the tripole solitons is increasing. Finally, the propagation stability of these bright solitons is further verified by adding white noise.

Key words: Multipolar bright soliton, Stability, Propagation characteristics, Nonlinear, Nonlocal nonlinear coupler

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