Wang Pei-Hsun, Ferdous Fahmida, Miao Houxun, Wang Jian, Leaird Daniel E, Srinivasan Kartik, Chen Lei, Aksyuk Vladimir, Weiner Andrew M
School of Electrical and Computer Engineering, Purdue University, 465 Northwestern Avenue, West Lafayette, IN 47907-2035, USA.
Opt Express. 2012 Dec 31;20(28):29284-95. doi: 10.1364/OE.20.029284.
Microresonator optical frequency combs based on cascaded four-wave mixing are potentially attractive as a multi-wavelength source for on-chip optical communications. In this paper we compare time domain coherence, radio-frequency (RF) intensity noise, and individual line optical communications performance for combs generated from two different silicon nitride microresonators. The comb generated by one microresonator forms directly with lines spaced by a single free spectral range (FSR) and exhibits high coherence, low noise, and excellent 10 Gbit/s optical communications results. The comb generated by the second microresonator forms initially with multiple FSR line spacing, with additional lines later filling to reach single FSR spacing. This comb exhibits degraded coherence, increased intensity noise, and severely degraded communications performance. This study is to our knowledge the first to simultaneously investigate and observe a correlation between the route to comb formation, the coherence, noise, and optical communications performance of a Kerr comb.
基于级联四波混频的微谐振器光频梳作为片上光通信的多波长源具有潜在吸引力。在本文中，我们比较了由两种不同的氮化硅微谐振器产生的光频梳在时域相干性、射频（RF）强度噪声以及各条谱线的光通信性能。由一个微谐振器产生的光频梳直接形成，其谱线间隔为单个自由谱范围（FSR），并表现出高相干性、低噪声以及出色的10 Gbit/s光通信结果。由第二个微谐振器产生的光频梳最初形成时具有多个FSR谱线间隔，随后有额外的谱线填充进来以达到单个FSR间隔。这种光频梳表现出相干性下降、强度噪声增加以及通信性能严重下降。据我们所知，本研究首次同时研究并观察到克尔光频梳的形成路径、相干性、噪声以及光通信性能之间的相关性。
