Spectral line-by-line pulse shaping of on-chip microresonator frequency combs
Spectral line-by-line pulse shaping of on-chip microresonator frequency combs
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DOI：
10.1038/nphoton.2011.255
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发表时间：
2011-12-01
期刊：
影响因子：
35
通讯作者：
Weiner, Andrew M.
中科院分区：
文献类型：
--
作者：
Ferdous, Fahmida;Miao, Houxun;Weiner, Andrew M.
最近，基于超高品质因数单片微谐振器中的非线性光学调制的片上梳产生方法已经被证明，其中两个泵浦光子在克尔非线性介导的四波混频过程中被转换为边带光子。在这里，我们调查线的脉冲成形的氮化硅环形谐振器中产生的这种梳。我们观察到两个不同的路径梳形成，表现出显着不同的时域行为。对于梳形成为由从泵浦传播的单个自由光谱范围间隔开的边带的级联，我们能够稳定地压缩到接近带宽受限的脉冲。这表明整个光谱的高相干性，并提供了关于光谱相位的高被动稳定性的新数据。对于其中初始边带由多个自由光谱范围间隔开的梳，然后填充以给出具有单个自由光谱范围间隔的梳，时域数据揭示部分相干行为。
Recently, on-chip comb generation methods based on nonlinear optical modulation in ultrahigh-quality-factor monolithic microresonators have been demonstrated, where two pump photons are transformed into sideband photons in a four-wave-mixing process mediated by Kerr nonlinearity. Here, we investigate line-by-line pulse shaping of such combs generated in silicon nitride ring resonators. We observe two distinct paths to comb formation that exhibit strikingly different time-domain behaviours. For combs formed as a cascade of sidebands spaced by a single free spectral range that spread from the pump, we are able to compress stably to nearly bandwidth-limited pulses. This indicates high coherence across the spectra and provides new data on the high passive stability of the spectral phase. For combs where the initial sidebands are spaced by multiple free spectral ranges that then fill in to give combs with single free-spectral-range spacing, the time-domain data reveal partially coherent behaviour.