The optical fiber communication system is one of the components of the supporting system in the modern Internet fields. Under investigation in this paper is a coupled fourth-order nonlinear Schrödinger system, which describes the ultrashort optical pluses in a birefringent optical fiber. By virtue of the existing Lax pair, generalized Darboux transformation, two- and three-soliton solutions are derived. Based on such solutions, we graphically display (1) the elastic interactions between/among the two/three solitons on a zero-intensity background, where amplitudes of the solitons remain unchanged; (2) the inelastic interactions between/among the two/three solitons, where amplitudes of the solitons change; (3) the bound states among the three solitons.

光纤通信系统是现代互联网领域中支持系统的组成部分之一。本文正在研究的是耦合的四阶非线性Schrödinger系统，该系统描述了双折射光纤中的超短光学脉冲。借助于现有的Lax对，广义Darboux变换，导出了二孤子解和三孤子解。基于这样的解决方案，我们以图形方式显示（1）在零强度背景下，两个/三个孤子之间/之中的弹性相互作用，其中孤子的振幅保持不变；（2）两个/三个孤子之间/之中的非弹性相互作用，其中孤子的振幅发生变化；（3）三个孤子之间的束缚态。