Second-order Optical Soliton Transmission Characteristics

For the issue of the interaction of optical solitons, there have been many studies focusing on the interaction of fundamental solitons, but few is on the interaction of higher-order solitions. In this paper, the propagation of two neighboring second-order solitons in single-mode fiber is investigated with Split-step Fourier Algorithm. On the basis of summarizing the reported research results, some useful results were obtained.Under the influence of third-order dispersion, the interaction of second order solitons in dispersion-shifted fibers is investigated numerically. The characteristics of second order solitions split is studied in the time and frequency domain. It is found that under the influence of third-order dispersion, tow second order solitons are both split and apart from each other. But the frequency shift is decreased. A nonlinear gain and periodical alternation of third-order dispersion can be used to effectively suppress soliton interactions and the effects of third-order dispersion, and stabilize the soliton propagation.Temporal phase conjugation(TPC) was proposed to compensate for group-velocity dispersion, self-phase modulation, and intrapulse Raman scattering of an optical pulse. However, when the pulse width is sufficiently short or the center wavelength is near the zero-dispersion point, third-order dispersion becomes more prominent and limits the reshaping performance of TPC. We propose to use a spectral phase conjugation(SPC) method that conjugations of the optical pulse in the frequency domain. With this method dispersion of all orders, self-phase modulation, and self-steepening in a fiber are automatically compensated. A hybrid scheme combining SPC and nonlinear gain can offer superior performance.