CAJ | 학술논문

由于变系数非线性Schr?dinger方程的增益、色散和非线性项都是变化的，根据方程这一特点可以研究光脉冲在非均匀光纤中的传输特性。本文利用Hirota方法，得到非线性Schr?dinger方程的解析暗孤子解。然后根据暗孤子解对暗孤子的传输特性进行讨论，并且分析各个物理参量对暗孤子传输的影响。经研究发现，通过调节光纤的损耗、色散和非线性效应都能有效的控制暗孤子的传输，从而提高非均匀光纤中的光脉冲传输质量。此外，本文还得到了所求解方程的解析双暗孤子解，最后对两个暗孤子相互作用进行了探讨。本文得到的结论有利于研究非均匀光纤中的孤子控制技术。
유우변계수비선성Schr?dinger방정적증익、색산화비선성항도시변화적，근거방정저일특점가이연구광맥충재비균균광섬중적전수특성。본문이용Hirota방법，득도비선성Schr?dinger방정적해석암고자해。연후근거암고자해대암고자적전수특성진행토론，병차분석각개물리삼량대암고자전수적영향。경연구발현，통과조절광섬적손모、색산화비선성효응도능유효적공제암고자적전수，종이제고비균균광섬중적광맥충전수질량。차외，본문환득도료소구해방정적해석쌍암고자해，최후대량개암고자상호작용진행료탐토。본문득도적결론유리우연구비균균광섬중적고자공제기술。
The terms of gain(or absorption), dispersion, and nonlinearity in the nonlinear Schr?dinger equation are usually variables, which can be used to study the propagation of optical pulses in inhomogeneous optical fibers. In this paper, with the aid of the Hirota method, the bilinear forms of the Schr?dinger equation are derived. Based on the bilinear form, the analytic dark soliton solutions to the nonlinear Schr?dinger equation are obtained. The properties of dark solitons are discussed. Stable dark solitons are observed in the normal dispersion regime. In addition, corresponding parameters for controlling the propagation of dark solitons are analyzed. Results of our research show that the propagation route of solitons can be effectively controlled by the gain(or absorption), dispersion, and nonlinearity, which can improve the quality of signal transmission in optical communications. When the amplitude of the loss coe?cient increases, the amplitude of the dark soliton increases suddenly during the transmission process.By means of changing the type of dispersion, the purpose of controlling the dark soliton phase and phase oscillation is achieved. The possibly applicable soliton control techniques, which are used to design dispersion and nonlinearity-managed systems, are proposed. The proposed techniques may find applications in soliton management communication links, like soliton control.In addition, two-soliton solution is obtained. With the dark two-soliton solution, the interaction between two solitons is discussed in the paper. The result may be of potential application in the ultralarge capacity transmission systems.