【摘要】 从光纤中非线性薛定谔方程出发,采用分步傅里叶算法数值模拟了具有高斯型连续谱的光脉冲扰动下连续波在光纤中的波形和频谱演化。结果表明,在光纤负色散区,由于调制不稳定性,该脉冲扰动下的连续波也可能像正弦波扰动下的那样演化成高重复率超短脉冲串,但构成脉冲串的各脉冲并不像正弦波扰动时那样等宽、等高、等间距。当孤子参数太小或在正色散区时,则不能形成脉冲串,只能形成衰减的振荡结构。随着孤子参数的不同,超短脉冲串及振荡结构的特点也会不同。这些演化规律与传统正弦光扰动连续波及高斯光脉冲的情形明显不同。更多还原

【Abstract】 Based on the nonlinear Schrdinger equation and the stepped Fourier method,the shape and spectrum evolutions of continuous-wave perturbed by an optical pulse with Gaussian-typed continuum spectrum in an optical fiber are numerically simulated.The results show that,due to modulation instability in the anomalous dispersion region of the optical fiber,this pulse perturbed continuous-wave can also evolve into high-repetition-rate pulse trains,which is similar to the case of sine perturbed one.Being different from the latter case,however,the generated pulses are not equal to each other in terms of widths,intensities,and intervals.When soliton parameters are too small or the optical wave is in the normal dispersion region,only attenuation oscillation structures instead of pulse trains can be generated.And the characteristics of pulse trains or oscillation structures will vary with the soliton parameters.These evolution characteristics are obviously different from those of conventional sine perturbed continuous-waves and Gaussian optical pulses.更多还原