Temporal Imaging of Optical Asymmetric Waveform Pulses With a Time Lens
Temporal Imaging of Optical Asymmetric Waveform Pulses With a Time Lens
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使用时间透镜对光学不对称波形脉冲进行时间成像
DOI：
10.1109/jphot.2015.2464078
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发表时间：
2015
影响因子：
2.4
通讯作者：
and Takashi Kurokawa
中科院分区：
文献类型：
--
作者：
Azusa Hasegawa;Ken Kashiwagi;Yosuke Tanaka;and Takashi Kurokawa
在本文中，我们研究了由两根光纤和一个相位调制器组成的时间成像（TI）系统上不对称脉冲的成像条件。我们引入了适应度函数来评估目标波形和输出波形之间的差异，从而定量估计 TI 特性。通过模拟适应度函数，我们成功确定了相位调制指数和相位偏差的最佳组合，以提供良好的TI。我们使用在线波导脉冲合成器（即光脉冲合成器）基于脉冲整形生成具有对称和非对称波形的无啁啾脉冲，并通过实验证实了时间透镜系统中的 TI 条件。此外，TI不仅在满足TI条件的调制指数的理论值下实现，而且在比时间反转模式的理论值小得多的值下实现。实验输出的测量波形与仿真结果一致。这对于实际应用可能很重要，因为 TI 系统需要小得多的调制功率。
In this paper, we investigated the imaging condition of asymmetric pulses on a temporal imaging (TI) system comprising two optical fibers and a phase modulator. We introduced a fitness function to evaluate the difference between target and output waveforms to quantitatively estimate TI characteristics. We successfully determined the optimal combination of phase modulation index and phase deviation to provide good TI by simulating the fitness function. We generated chirp-free pulses with symmetric and asymmetric waveforms using an in-line waveguide pulse synthesizer, i.e., an optical pulse synthesizer, based on pulse shaping and experimentally confirmed the TI condition in a time lens system. Moreover, TI was achieved not only at a theoretical value of the modulation index satisfying the TI condition but at a much smaller value than the theoretical value for a time-reversal mode as well. Measured waveforms of the experimental output agreed with simulation results. This may be important for practical applications because a TI system requires a much smaller modulation power.