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提出一种利用周期性抛物线调制信号对光脉冲进行相位调制以获得周期性线性啁啾脉冲的方法,并对其进行了数值模拟与实验研究.数值模拟结果表明:增益饱和效应、群速度色散以及同步误差对啁啾脉冲的时间-光谱特性影响较大;自相位调制对啁啾脉冲的影响较小.实验获得了0.52nm带宽的周期性线性啁啾脉冲,与模拟结果符合较好.实验结果同时表明装置中存在较大的偏振模色散,导致幅频效应较大,后续的研究中需加入对此的考虑.模拟及实验研究表明:直接相位调制是一种新型的可方便地获得周期性线性啁啾脉冲的方法,其在光谱色散平滑中具有潜在应用.
A method for phase-modulating the optical pulse using a periodic parabolic modulation signal to obtain a periodic linearly chirped pulse is proposed, and the numerical simulation and experimental research are carried out.The numerical simulation results show that the gain saturation effect, group velocity dispersion, The synchronization error has a great influence on the chrono-spectral characteristics of the chirped pulse, and the self-phase modulation has little effect on the chirped pulse.The periodic linear chirp pulse with 0.52nm bandwidth is obtained experimentally, which is in good agreement with the simulation results.Experimental results At the same time, it shows that there is a large polarization mode dispersion in the device, which leads to a large amplitude-frequency effect, which needs to be considered in subsequent research.Modeling and experimental studies show that direct phase modulation is a new method to obtain periodicity A method of linearly chirped pulses that has potential applications in spectral dispersion smoothing.