副载波调制信号的双频梳状辅助模数转换
Dual Frequency Comb Assisted Analog-to-Digital Conversion of Subcarrier Modulated Signals
摘要：
光子模数转换有望克服传统模数转换器（ADC）中的信噪比（SNR）和采样率折衷，这对于现代数字通信和信号分析至关重要。我们建议使用具有固定频率间隔偏移的相位稳定双频梳来下变频宽带信号的频谱切片，并实现高分辨率并行数字化。为了证明我们所提出的方法的概念，我们演示了10 GHz的副载波调制（SCM）信号的检测使用500 MHz带宽的ADC通过光学转换的SCM信号，可以并行处理的10 GHz带宽的信号，完整的信号检测和重建。使用基于正弦波的标准ADC测试，我们证明了> 45 dB的无杂散动态范围（SFDR）和> 20 dB的信噪比（SINAD），仅受接收机前端设计的限制。我们的实验研究表明，这种SINAD限制可以克服改进的接收机设计，有前途的宽带信号的高分辨率ADC。
英文摘要：
Photonic analog to digital conversion offers promise to overcome the signal-to-noise ratio (SNR) and sample rate trade-off in conventional analog to digital converters (ADCs), critical for modern digital communications and signal analysis. We propose using phase-stable dual frequency combs with a fixed frequency spacing offset to downconvert spectral slices of a broadband signal and enable high resolution parallel digitization. To prove the concept of our proposed method, we demonstrate the detection of a 10-GHz subcarrier modulated (SCM) signal using 500-MHz bandwidth ADCs by optically converting the SCM signal to ten 1-GHz bandwidth signals that can be processed in parallel for full signal detection and reconstruction. Using sinusoidal wave based standard ADC testing, we demonstrate a spurious-free dynamic range (SFDR) of >45dB and signal-to-noise-and-distortion (SINAD) of >20dB, only limited by the receiver front-end design. Our experimental investigation reveals that this SINAD limitation can be overcome by improved receiver design, promising high resolution ADC for broadband signals.
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