Journal
OPTICS EXPRESS
Volume 16, Issue 21, Pages 16509-16515Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.16.016509
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Funding
- Agency (DARPA) EPIC [W911NF-04-1-0431]
- Air Force Office of Scientific Research (AFOSR) [FA9550-07-1-0014]
- National Science Foundation (NSF) [0238166]
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [0238166] Funding Source: National Science Foundation
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Conversion of analog signals into digital signals is one of the most important functionalities in modern signal processing systems. As the signal frequency increases beyond 10 GHz, the timing jitter from electronic clocks, currently limited at similar to 100 fs, compromises the achievable resolution of analog-to-digital converters (ADCs). Owing to their ultralow timing jitter, the use of optical pulse trains from passively mode-locked lasers has been considered to be a promising way for sampling electronic signals. In this paper, based on sub-10 fs jitter optical sampling pulse trains, we demonstrate a photonic subsampling ADC that downconverts and digitizes a narrowband microwave signal at 40 GHz carrier frequency with higher than 7 effective-number-of-bit (ENOB) resolution. (c) 2008 Optical Society of America
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