A low-phase-noise 18 GHz Kerr frequency microcomb phase-locked over 65 THz.
A low-phase-noise 18 GHz Kerr frequency microcomb phase-locked over 65 THz.
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DOI：
10.1038/srep13355
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发表时间：
2015-08-27
影响因子：
4.6
通讯作者：
Wong CW
中科院分区：
文献类型：
--
作者：
Huang SW;Yang J;Lim J;Zhou H;Yu M;Kwong DL;Wong CW
激光频率梳是一种相干光源，可同时为精密计量提供原始频率间隔，并为超快和阿秒科学提供基础。最近，高Q值微谐振器中的非线性参数转换已被建议作为光学频率梳的替代平台，尽管几乎都在100 GHz或更高的频率。在这里，我们报告了一个低相位噪声的片上克尔频率梳与模式间距兼容的高速硅光电子学。氮化硅螺旋谐振器的波导横截面被设计成具有小的且平坦的群速度色散，使得克尔频率梳包含创纪录的3，600个锁相梳线。我们研究了单边带相位噪声以及长期频率稳定度，并报告了迄今为止18 GHz克尔梳状振荡器在1 MHz偏移时实现的最低相位噪声基底，为−130 dBc/Hz，沿着反馈稳定，在1 s内实现7 × 10−11的频率艾伦偏差。报告的系统是一个有前途的紧凑的平台，实现自参考克尔频率梳，也为高容量的相干通信架构。
Laser frequency combs are coherent light sources that simultaneously provide pristine frequency spacings for precision metrology and the fundamental basis for ultrafast and attosecond sciences. Recently, nonlinear parametric conversion in high-Q microresonators has been suggested as an alternative platform for optical frequency combs, though almost all in 100 GHz frequencies or more. Here we report a low-phase-noise on-chip Kerr frequency comb with mode spacing compatible with high-speed silicon optoelectronics. The waveguide cross-section of the silicon nitride spiral resonator is designed to possess small and flattened group velocity dispersion, so that the Kerr frequency comb contains a record-high number of 3,600 phase-locked comb lines. We study the single-sideband phase noise as well as the long-term frequency stability and report the lowest phase noise floor achieved to date with −130 dBc/Hz at 1 MHz offset for the 18 GHz Kerr comb oscillator, along with feedback stabilization to achieve frequency Allan deviations of 7 × 10−11 in 1 s. The reported system is a promising compact platform for achieving self-referenced Kerr frequency combs and also for high-capacity coherent communication architectures.