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提出了一种调控脉冲光纤放大器时域特性的新方法。根据光纤放大器中脉冲时域波形畸变的基本原理以及实际应用中对输出脉冲的具体要求,采用随机并行梯度下降(SPGD)算法获取生成目标输出脉冲所需要的最优输入脉冲。通过数值仿真,实现了多种指定脉冲的输出,证明了所提方法的有效性。利用SPGD算法可不断改变输入脉冲,使光纤放大器的真实输出逼近目标输出,该控制策略简单且输出脉冲收敛迅速。利用该方法获取直线边界脉冲(如矩形、M型和三角型脉冲)和曲线边界脉冲(如抛物线型和椭圆型脉冲)时均取得较好的效果,因此该方法适用于多种类型目标脉冲的生成。
A new method to control the time-domain characteristics of pulsed fiber amplifiers is proposed. According to the fundamental principle of pulse time domain waveform distortion in fiber amplifier and the practical requirements of output pulse, we use the algorithm of SPGD (Random Gradient Degradation) to get the optimal input pulse needed to generate the target output pulse. Through numerical simulation, the output of a variety of designated pulses is achieved, which proves the effectiveness of the proposed method. By using SPGD algorithm, the input pulse can be continuously changed so that the real output of the fiber amplifier approaches the target output. The control strategy is simple and the output pulse converges rapidly. This method can achieve good results when obtaining linear boundary pulses (such as rectangular, M-type and triangular-type pulses) and curve boundary pulses (such as parabolic and elliptical pulses), so this method is suitable for many types of target pulses generate.