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采用啁啾脉冲堆积的方法获得平顶宽脉冲,根据波包传输近似方程,数值模拟了堆积脉冲在线性介质中的传输特性,给出了初始堆积子脉冲延迟引入不同初始位相差和不同啁啾量情况下堆积脉冲时间波形传输的演变规律。结果表明,子脉冲间距差引入的初始延迟参数的细微变化就会引起初始位相差的显著变化,导致堆积脉冲包络相对子脉冲延迟参数不稳定;包络脉冲的特性与子脉冲的载频、脉冲形状、脉宽和啁啾量等子脉冲参数,及子脉冲间的延迟参数等有关;啁啾越大、子脉冲初始脉宽越短、传输介质色散系数越大,则传输后的堆积脉冲时间调制变化越严重。
According to the approximate equation of wave packet transmission, the propagation characteristics of the impulsive pulses in a linear medium are simulated. The delay of the initial impulsive sub-pulse is introduced to introduce the initial phase difference and the different chirp The Evolution of Waveforms of Accumulation Pulse Time in the Case of. The results show that the subtle variation of the initial delay parameter introduced by the interpulse spacing difference will lead to the significant change of the initial phase difference, resulting in the instability of the delay pulse parameters of the stacked pulse envelope; the characteristics of the envelope pulse and the sub-pulse carrier frequency, Pulse shape, pulse width and chirp and other sub-pulse parameters, and the delay between sub-pulse parameters; the larger the chirp, the shorter the initial pulse width of the sub-pulse, the larger the dispersion coefficient of the transmission medium, the accumulation of pulses after transmission The more time modulation changes.