Journal
OPTICS LETTERS
Volume 45, Issue 1, Pages 173-176Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.45.000173
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Funding
- Engineering and Physical Sciences Research Council [EP/R035342/1, EP/R041792/1]
- Royal Society [PIF/R1/180001]
- EPSRC [EP/R041792/1, EP/R035342/1] Funding Source: UKRI
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Photonic analog to digital conversion offers promise to overcome the signal-to-noise ratio 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 prow 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 10 1 GHz bandwidth signals that can be processed in parallel for full signal detection and reconstruction. Using sinusoidalwave-based standard ADC testing, we demonstrate a spurious-free dynamic range of >45 dB and signal-tonoise-and-distortion of >20 dB, limited by the receiver front-end design. (C) 2019 Optical Society of America
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