In New J. Phys. 16, 053048 (2014), Wang et al. have experimentally demonstrated the formation of bright solitons with repulsive nonlinearity and compared their results numerically by making use of the modified nonlinear Schrödinger equation (NLSE) with constant coefficients. We have extended their study by making the coefficients of NLSE time dependent, as they represent more realistic scenarios and are helpful in understanding the physics of the system in a better way. We have then analytically presented the bright soliton solutions with repulsive nonlinearity for the variable coefficient NLSE. These results have been obtained for the small variation of the time-dependent localized cubic and quintic nonlinearities. Additionally, we have discussed other possibilities which may support the formation of bright solitons in yttrium iron garnet thin film strips.

• Received 18 June 2015

DOI:https://doi.org/10.1103/PhysRevA.92.033811