论文标题
分散元件对基于塔尔伯特效应的光学上转换方案中相位噪声抑制的影响
Influence of dispersive element on phase noise suppression in Talbot effect based optical upconversion scheme
论文作者
论文摘要
时间塔尔伯特效应支持光学域中纯度较高的RF信号的产生。例如，这允许远程RF生成，而无需昂贵的高端电子电路和资源共享。但是，该方法最有趣的特征之一是在载体生成过程中抑制相位噪声的固有能力。除了梳子激光源外，色散元素是此上转换方案中的关键组件。理想情况下，它在梳子的整个光谱范围内提供了适量的分散体。预计较宽的梳子将允许更高的相位噪声抑制。在计算和记忆工作方面，光学方案产生的RF音调的相位噪声模拟。因此，必须开发一个模拟工具利用梳子的性能和塔尔伯特效应。在本文中，研究了相位噪声抑制对分散特征的依赖性，从而对这些元素的设计产生了重要的输入。首先，实现的仿真工具和仿真参数确保引入分散前后的相位噪声的正确估计。然后，分析了不同分散特征对相位噪声行为的影响。可以显示并解释不同偏移频率的相位噪声如何根据分散特征以及梳子宽度的不同影响。所需的梳子宽度的设计规则以及根据对相位改进的需求的理想价值从理想价值中产生的分散体的可接受变化，并将提出。
The temporal Talbot effect supports the generation of RF signals with high purity in optical domain. This allows for example a remote RF generation without the need for costly high-end electronic circuits and resource sharing. However, one of the most interesting features of the approach is its inherent ability to suppress phase noise during the carrier generation process. Besides the comb laser source, the dispersive element is the key component in this upconversion scheme. Ideally, it provides the right amount of dispersion over the whole spectral range of the comb. Broader combs are expected to allow a higher degree of phase noise suppression. The simulation of phase noise of an RF tone generated by an optical scheme is challenging in terms of computational and memory effort. Therefore, a simulation tool taking advantage of the properties of the comb and the Talbot effect had to be developed. In this paper, the dependency of the phase noise suppression on the dispersion characteristic is investigated yielding an important input to the design of these elements. First, the implemented simulation tool and the simulation parameters ensuring a correct estimation of the phase noise before and after dispersion influence are introduced. Then, the effect of different dispersion characteristics on the phase noise behavior is analyzed. It could be shown and explained how the phase noise at different offset frequencies to the carrier is affected differently depending on the dispersion characteristic and also the comb width. Design rules for the required comb width as well as the acceptable variation of the produced dispersion from the ideal value depending on the demands for the phase noise improvements could be developed and will be presented.
