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Photonic direct digital synthesis (PDDS) of ultra wide band waveforms from DC to 20 GHz instantaneous bandwidth

PDDS is a method using a single photonic chip (OEIC) to generate, direct from digital data, microwave signals across a UWB. The systems demonstrated provide from the time domain control of waveforms at 20 picosecond resolution and over a time period only limited by the generation of data. In this paper we present measured results from laboratory demonstration devices in COTS optical systems.