arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1604.01427physics.ins-detphysics.optics
收藏

时间交错光子模数转换器的基本理论模型和采样准则

Basic Theoretical Model and Sampling Criteria for Time-Interleaved Photonic Analog-to-Digital Converters

Feiran Su, Guiling Wu, Weiwen Zou, Jianping Chen

摘要:

本文提出了时间交错光子模数转换器(TIPADC)的基本模型,分析了其线性、非线性和噪声性能。阐述了TIPADC的基本工作机理,并在频域分析了其线性性能。在每个处理步骤中给出了系统的数学表达式和输出。我们发现,光子采样折叠在一个窄带输入信号的整个频谱,这使得模拟带宽的TIPADC要远远高于后端电子的带宽。根据系统的频率响应得到了系统的可行域,并针对典型应用总结了一套确定系统基本要求的采样准则。结果表明,当光子采样脉冲的带宽与输入信号频率相当时,后端电子系统的全局最小可行带宽为单通道采样速率的一半。研究了光子采样脉冲训练的幅度噪声和相位噪声、光电探测器的热噪声和散粒噪声散粒噪声以及EADC的量化噪声和孔径抖动噪声。分析了TIPADC的非线性特性。定性和定量地讨论了单通道采样率、平均光功率和后端电路带宽等因素对TIPADC有效比特数的影响。结果表明,TIPADC能够对超高速模拟信号进行高保真转换,克服了传统ADC的孔径抖动和带宽等主要性能限制。所推导的准则将是设计TIPADC时对广义采样定理的有效补充。

英文摘要:

In this paper, we present a basic model for time-interleaved photonic analog-to-digital converter (TIPADC) and analyze its linear, nonlinear, and noise performance. The basic operation mechanism of TIPADC is illustrated and the linear performance is analyzed in frequency domain. The mathematical expressions and the output of the system are presented in each processing step. We reveal that photonic sampling folds the whole spectrum of input signal in a narrow band, which enables the analog bandwidth of a TIPADC to be much higher than the bandwidth of back-end electronics. The feasible regions of the system is obtained in terms of system frequency response, and a set of sampling criteria determining the basic requirements to the system are summarized for typical applications. The results show that the global minimum feasible bandwidth of back-end electronics is the half of single channel sampling rate when the bandwidth of photonic sampling pulse is comparable to input signal frequency. The amplitude and phase noise of photonic sampling pulse train, the thermal noise and shot noise of photodetection, and the quantization noise and aperture jitter noise of EADCs are investigated. The nonlinearity of TIPADC is also analyzed. The effect of different factors, such as the single channel sampling rate, the average optical power and the bandwidth of back-end electronics, on the effective number of bits of TIPADC is qualitatively and quantitatively discussed. The results explicitly show that TIPADC can perform high fidelity conversion to ultra-high speed analog signal and overcome the major performance limitations existing in traditional ADCs such as aperture jitter and bandwidth. The criteria deduced will be an effective supplement to the generalized sampling theorem in designing TIPADC.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑