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运用分步Fourier算法求解非线性薛定谔方程,研究了非零色散光纤中三阶色散系数对孤子脉冲在光纤中传输的影响。结果表明,通过数值模拟,在三阶色散作用下,孤子在光传输中脉冲的能量、脉冲频移、脉冲宽度、中心位置都随传输距离呈现振荡式变化.与零色散光纤对比,分析了孤子间相互作用随传输距离变化的特性,证明在非零色散位移中孤子间距和增加二阶滤波器能有效保持信号稳定的传输;这对实现超远距离光纤传输,提高通信系统超高码率有一定实际意义。
The staged Fourier algorithm was used to solve the nonlinear Schrödinger equation, and the influence of the third-order dispersion coefficient on the propagation of soliton pulses in the fiber was studied. The results show that with the third-order dispersion, the energy, pulse frequency shift, pulse width and center position of the soliton oscillate with the transmission distance in optical transmission.Compared with the zero-dispersion optical fiber, the soliton It is proved that the soliton spacing and the second-order filter can effectively maintain the stable signal transmission in the non-zero dispersion displacement. It is very important to realize the ultra-long-distance optical fiber transmission and improve the high bit rate of the communication system Some practical significance.