Yang, Rui; Vercesi, Valeria; Seeds, Alwyn; Liu, Chin; (2024) Photonic sampling of microwave signals with adjustable sampling frequencies using an optical frequency comb. Optics Express (In press).

Text Liu_Photonic Sampling paper for Optics Express pre-production.pdf Access restricted to UCL open access staff until 19 January 2025. Download (7MB)

Abstract

We propose and demonstrate a novel photonic sampling technique using an agile optical frequency comb generator achieving flexible sampling frequencies. A number of comb lines are carved into sampling pulses which are then time-dispersed along a single-mode optical fiber as a function of the electronically adjusted comb line spacing and the number of comb lines selected. Successful sampling and demodulation of QAM signals up to a 17 GHz carrier frequency with a sampling rate up to 50 GSa/s have been demonstrated. A minimum 1.5% EVM at 3 GHz and a maximum 4.4 bits (ENOB) at 2.1 GHz were also measured.

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