论文部分内容阅读
采用分步傅里叶方法数值研究了初始线性啁啾和非线性啁啾双曲正割光脉冲在单模光纤反常色散区的线性传输特性,并与啁啾高斯脉冲的线性传输特性作了比较.给出了双曲正割光脉冲频谱宽度和时间带宽积随初始线性啁啾变化的表达式.结果表明,双曲正割脉冲在线性啁啾|C|>0·1时随传输距离的增加逐渐演化成近高斯型,在0≤|C|≤0·1时最后将演化为近双曲正割脉冲.|C|越小,脉冲时域波形越趋近双曲正割曲线.负啁啾对脉冲时域展宽的影响比正啁啾要大得多.当|C|≥0·5时,初始啁啾对双曲正割光脉冲展宽的影响比对高斯脉冲的影响更大.非线性啁啾双曲正割光脉冲在线性传输过程中会出现时域波形分裂现象,比具有相同啁啾的高斯脉冲时域波形分裂严重.
The linear transmission characteristics of the initial linear chirp and the nonlinear chirped hyperbolic secant optical pulses in the anomalous dispersion region of single mode fiber are numerically studied by the step Fourier method and compared with the linear transmission characteristics of the chirped Gaussian pulse The expressions of spectral width and time bandwidth of hyperbolic secant optical pulse with initial linear chirp are given. The results show that the hyperbolic secant pulses with linear chirp | C |> 0.1 with the transmission distance And gradually evolve into nearly Gaussian, and finally evolve to near-hyperbolic secant when 0≤ | C | ≤0.1 The smaller the | C |, the closer the pulse waveform becomes to the hyperbolic secant curve. The effect of chirp on the pulse time domain broadening is much greater than that of the positive chirp. When | C | ≥0.5, the effect of the initial chirp on the pulse broadening of the hyperbolic secant is greater than that of the Gaussian pulse. Nonlinear chirped hyperbolic secant optical pulses appear time-domain waveform splitting phenomenon in the linear transmission process, which is more serious than the time-domain waveform splitting of Gaussian pulse with the same chirp.