Pottiez O, Deparis O, Kiyan R, Mégret P, Blondel M
Opt Lett. 2001 Nov 15;26(22):1779-81. doi: 10.1364/ol.26.001779.
We propose a technique for measuring both pulse width and amplitude jitter noises of high-repetition-rate optical pulse trains and the cross correlation between these noises as well. The technique is based on time-domain amplitude demodulation of three harmonic components of the detected pulse train. We applied this technique to characterize noises of a gigahertz optical pulse train generated by an actively mode-locked Er-doped fiber laser. Correlation between pulse width jitter and pulse amplitude jitter was observed at low frequencies in this laser. Unlike relaxation oscillation noise, low-frequency noise is free from pulse energy jitter. Owing to its ability to measure pulse width jitter in addition to amplitude and phase jitters, this technique is of great interest for characterizing noises of a wide variety of optical pulse train sources.
我们提出了一种用于测量高重复率光脉冲序列的脉宽和幅度抖动噪声以及这些噪声之间互相关性的技术。该技术基于对检测到的脉冲序列的三个谐波分量进行时域幅度解调。我们将此技术应用于表征由主动锁模掺铒光纤激光器产生的千兆赫兹光脉冲序列的噪声。在该激光器中，在低频处观察到了脉宽抖动和脉冲幅度抖动之间的相关性。与弛豫振荡噪声不同，低频噪声不存在脉冲能量抖动。由于该技术除了能够测量幅度和相位抖动外，还能测量脉宽抖动，因此对于表征各种光脉冲序列源的噪声具有重要意义。
