Bendahmane A, Fatome J, Finot C, Millot G, Kibler B
Opt Lett. 2017 Jan 15;42(2):251-254. doi: 10.1364/OL.42.000251.
We investigate the coherent or incoherent seeding of dissipative modulation instability (MI) in a nonlinear fiber ring cavity. By varying wavelength and degree of coherence of the seed signal across the MI gain band, we observe a strong sensitivity of the resulting MI sidebands in terms of bandwidth and amplification. Both spectral and temporal characterizations are performed to reveal intensity coherence properties (over a single round-trip) of the generated temporal patterns. Experimental observations are well confirmed by numerical simulations. Our results provide new insights into the control of dissipative MI through a specific seeding in optical resonators with a moderate free-spectral range. In particular, a large tunability of the subsequent Kerr comb spacing is achieved by means of the early transient stage of seeded MI growth.
我们研究了非线性光纤环形腔中耗散调制不稳定性（MI）的相干或非相干种子注入。通过在MI增益带宽内改变种子信号的波长和相干度，我们观察到所产生的MI边带在带宽和放大方面具有很强的敏感性。进行了光谱和时间表征，以揭示所产生的时间模式的强度相干特性（在单个往返过程中）。数值模拟很好地证实了实验观察结果。我们的结果为通过在具有适度自由光谱范围的光学谐振器中进行特定种子注入来控制耗散MI提供了新的见解。特别是，通过种子MI增长的早期瞬态阶段实现了后续克尔频率梳间距的大可调谐性。
