Some types of dark soliton interactions in inhomogeneous optical fibers

• Published in: Optical and quantum electronics Vol. 50; no. 7; pp. 1 - 8
• Main Authors: Zhang, Yujia, Yang, Chunyu, Yu, Weitian, Liu, Mengli, Ma, Guoli, Liu, Wenjun
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.07.2018; Springer Nature B.V
• Subjects: Arches; Characterization and Evaluation of Materials; Computer Communication Networks; Electrical Engineering; Lasers; Nonlinear optics; Optical Devices; Optical fibers; Optics; Order parameters; Photonics; Physics; Physics and Astronomy; Schrodinger equation; Solitary waves; Switches; Variable-coefficient higher-order nonlinear Schrödinger equation; Dark solitons; Inhomogeneous optical fibers; Soliton interactions
• ISSN: 0306-8919; 1572-817X
• DOI: 10.1007/s11082-018-1560-7

Dark solitons are the subject of intense theoretical and experimental studies in nonlinear optics due to their unique characteristics compared with bright solitons. In this paper, the variable coefficient high-order nonlinear Schrödinger equation in the inhomogeneous optical fiber is investigated. Via the Hirota bilinear method and symbolic computation, the analytic dark two-soliton solutions are obtained. With the suitable choices of functions and coefficients for the obtained dark two-soliton solutions, some new phenomena are presented for the first time. The influences on phases and amplitudes of soliton interactions are detailed analyzed. Moreover, sets of double-triangle structures and methods of changing the propagation direction of dark solitons are introduced. Finally, by choosing suitable functions of the fourth-order dispersion parameter, the arch-structure and M-structure interactions are revealed. Results may be potentially useful in designing all-optical switches and optical fibers.