Photonic microwave true time delays for phased array antennas using a 49 GhZ FSR integrated optical micro-comb source [invited]

Xingyuan Xu, Jiayang Wu, Thach G. Nguyen, Tania Moein, Sai T. Chu, Brent E. Little, Roberto Morandotti, Arnan Mitchell, David J. Moss

Research output: Contribution to journalArticleResearchpeer-review

80 Citations (Scopus)


We demonstrate significantly improved performance of a microwave true time delay line based on an integrated optical frequency comb source. The broadband micro-comb (over 100 nm wide) features a record low free spectral range (FSR) of 49 GHz, resulting in an unprecedented record high channel number (81 over the C band)—the highest number of channels for an integrated comb source used for microwave signal processing. We theoretically analyze the performance of a phased array antenna and show that this large channel count results in a high angular resolution and wide beam-steering tunable range. This demonstrates the feasibility of our approach as a competitive solution toward implementing integrated photonic true time delays in radar and communications systems.

Original languageEnglish
Pages (from-to)B30-B36
Number of pages7
JournalPhotonics Research
Issue number5
Publication statusPublished - 1 May 2018
Externally publishedYes

Cite this