Decoherence due to XPM-assisted Raman amplification for polarization or wavelength offset pulses in all-normal dispersion supercontinuum generation
Decoherence due to XPM-assisted Raman amplification for polarization or wavelength offset pulses in all-normal dispersion supercontinuum generation
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DOI：
10.1364/josab.379563
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发表时间：
2020-03
影响因子：
1.9
通讯作者：
J. Feehan;J. Price
中科院分区：
文献类型：
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作者：
J. Feehan;J. Price
研究了交叉相位调制（XPM）对低能探测脉冲与高能泵浦脉冲在全正常色散（ANDi）光纤中的相干性的重要性，由于量子噪声的拉曼放大作用，探测脉冲与泵浦脉冲在光纤中产生非相干超连续谱。通过研究众多的光纤和脉冲参数，我们一致表明，对于弱探测脉冲，从泵的XPM是探测相干性的退化的主要影响。我们发现，在泵浦前沿的更快的退相干意味着当探测具有更高的群速度时，探测相干性降低得更显著，即，当正交偏振探针对准光纤的快（较低折射率）轴时，或者当共偏振探针具有较长的中心波长时。模拟结果表明，这种效应发生在保偏（PM）和非PM ANDi光纤，并可能导致探测退相干率高于泵。这些以前未报道的结果扩展了我们早期的标量模拟显示在一个单一的脉冲非相干超连续谱。
We report the importance of cross-phase modulation (XPM) on the coherence of a low-energy probe pulse co-propagating with a high-energy pump pulse that generates incoherent supercontinuum in all-normal dispersion (ANDi) fiber due to Raman amplification of quantum noise. By investigating numerous fiber and pulse parameters, we show consistently that for weak probe pulses, the XPM from the pump is the dominant influence on the degradation of the probe coherence. We show that the faster decoherence at the pump leading edge means that the probe coherence is reduced more significantly when the probe has a higher group velocity, i.e., when an orthogonally polarized probe is aligned to the fast (lower refractive index) axis of the fiber or when a co-polarized probe has a longer central wavelength. Simulations show that this effect occurs for both polarization-maintaining (PM) and non-PM ANDi fibers and can result in a probe decoherence rate that is higher than that of the pump. These previously unreported results extend our earlier scalar simulations showing incoherent supercontinuum within a single pulse.