Noise and distortion analysis of dual frequency comb photonic RF channelizers
Noise and distortion analysis of dual frequency comb photonic RF channelizers
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DOI：
10.1364/oe.410340
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发表时间：
2020-12-21
期刊：
影响因子：
3.8
通讯作者：
Liu, Zhixin
中科院分区：
文献类型：
--
作者：
Deakin, Callum;Liu, Zhixin
双频梳正在成为射频 (RF) 信号处理的高效通道器，在各种应用中显示出多种功能，包括傅里叶信号映射、模数转换和稀疏宽带信号的子采样。尽管之前的研究已经考虑了梳状功率和谐波失真对各个系统的影响，但缺乏严格、全面的性能分析，特别是在相位噪声的影响方面。考虑到相位噪声功率随梳状线数量呈二次方增加，这一点尤其重要。在本文中，我们开发了双频梳信道器的理论模型，并评估了在高带宽信号处理环境中部署此类系统时的信噪比限制和设计挑战。我们表明，这些基于双梳的信号处理器的性能受到两个光学频率梳之间的相对相位噪声的限制，据我们所知，以前的文献尚未考虑到这一点。我们的仿真验证了理论模型并检查了随机噪声贡献和谐波失真，随后对双频梳信道器的性能限制进行了更广泛的讨论，这证明了最小化两个频率梳之间的相对相位噪声以实现高信噪比信号处理的重要性。由光学协会根据知识共享署名 4.0 许可条款发布。
Dual frequency combs are emerging as highly effective channelizers for radio frequency (RF) signal processing, showing versatile capabilities in various applications including Fourier signal mapping, analog-to-digital conversion and sub-sampling of sparse wideband signals. Although previous research has considered the impact of comb power and harmonic distortions in individual systems, a rigorous and comprehensive performance analysis is lacking, particularly regarding the impact of phase noise. This is especially important considering that phase noise power increases quadratically with comb line number. In this paper, we develop a theoretical model of a dual frequency comb channelizer and evaluate the signal to noise ratio limits and design challenges when deploying such systems in a high bandwidth signal processing context. We show that the performance of these dual comb based signal processors is limited by the relative phase noise between the two optical frequency combs, which to our knowledge has not been considered in previous literature. Our simulations verify the theoretical model and examine the stochastic noise contributions and harmonic distortion, followed by a broader discussion of the performance limits of dual frequency comb channelizers, which demonstrate the importance of minimizing the relative phase noise between the two frequency combs to achieve high signal-to-noise ratio signal processing. Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License.