Dual frequency comb assisted analog-to-digital conversion

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Dual frequency comb assisted analog-to-digital conversion

Deakin, C; Liu, Z; (2020) Dual frequency comb assisted analog-to-digital conversion. Optics Letters , 45 (1) pp. 173-176. 10.1364/OL.45.000173. Green open access

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Abstract

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 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 10 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 of >45 dB and signal-to-noise-and-distortion of >20 dB, limited by the receiver front-end design.

Type:	Article
Title:	Dual frequency comb assisted analog-to-digital conversion
Open access status:	An open access version is available from UCL Discovery
DOI:	10.1364/OL.45.000173
Publisher version:	https://doi.org/10.1364/OL.45.000173
Language:	English
Additional information:	This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification:	UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI:	https://discovery.ucl.ac.uk/id/eprint/10090220