Solitary wave for a nonintegrable discrete nonlinear Schrödinger equation in nonlinear optical waveguide arrays

Ma Li-Yuan¹, Ji Jia-Liang², Xu Zong-Wei³, Zhu Zuo-Nong^{3, †}

(color online) (a) Stationary solitary wave of integrable discrete NLS equation (25) with parameters ω_s = 1 and h = 0.25. (b) Continuous spectrum and zero eigenvalue.