Figure 2. Dark solitons for Eq.(2) with b=1, c=1 (continuous curves) when solitons propagate.

From

New Meromorphic Solutions of the Cubic Nonlinear Schrödinger Equation by Using the Complex Method

Guoqiang Dang

Turkish Journal of Analysis and Number Theory. 2020, 8(4), 70-74 doi:10.12691/tjant-8-4-1