Noise-related polarization dynamics for femto and picosecond pulses in normal dispersion fibers.
Noise-related polarization dynamics for femto and picosecond pulses in normal dispersion fibers.
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DOI：
10.1364/oe.396404
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发表时间：
2020-07
期刊：
影响因子：
3.8
通讯作者：
J. Feehan;E. Brunetti;S. Yoffe;Wentao Li;S. M. Wiggins;D. Jaroszynski;J. Price
中科院分区：
文献类型：
--
作者：
J. Feehan;E. Brunetti;S. Yoffe;Wentao Li;S. M. Wiggins;D. Jaroszynski;J. Price
我们报告了在飞秒和皮秒泵浦脉冲中，全正常色散（ANDi）光纤中相干光破波和非相干拉曼放大过程的复杂脉冲内偏振动力学是如何变化的。利用高时间分辨率矢量超连续介质模拟，我们确定了飞秒脉冲由破波和自相位调制引起的确定性极化动力学，以及皮秒脉冲由量子噪声拉曼放大驱动的准混沌极化演化。与交叉相位调制不稳定性相比，基于拉曼的偏振噪声没有功率阈值，可以通过将高能偏振分量对准光纤的低折射率轴来降低。利用新的时域参数对偏振稳定度进行量化，该参数建立在超连续谱研究中用于量化输出光谱稳定性的光谱平均相干度的基础上。研究表明，光谱相干性与偏振噪声有着内在的联系，并且噪声将发生在保偏振（PM）和非保偏振光纤中，其脉冲能量、持续时间和光纤双折射值的范围很广。这一分析提供了对ANDi光纤中相干和非相干传播相关的非线性极化动力学的深入理解。
We report how the complex intra-pulse polarization dynamics of coherent optical wavebreaking and incoherent Raman amplification processes in all-normal dispersion (ANDi) fibers vary for femto and picosecond pump pulses. Using high temporal resolution vector supercontinuum simulations, we identify deterministic polarization dynamics caused by wavebreaking and self-phase modulation for femtosecond pulses and quasi-chaotic polarization evolution driven by Raman amplification of quantum noise for picosecond pulses. In contrast to cross-phase modulation instability, the Raman-based polarization noise has no power threshold and is reduced by aligning the higher energy polarization component with the lower index axis of the fiber. The degree of polarization stability is quantified using new time domain parameters that build on the spectrally averaged degree of coherence used in supercontinuum research to quantify the output spectral stability. We show that the spectral coherence is intrinsically linked to polarization noise, and that the noise will occur in both polarization maintaining (PM) and non-PM fibers, spanning a broad range of pulse energies, durations, and fiber birefringence values. This analysis provides an in-depth understanding of the nonlinear polarization dynamics associated with coherent and incoherent propagation in ANDi fibers.