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High-performance microwave photonic true time delays based on an integrated optical micro-comb source
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Paper Abstract

Microwave photonic true time delay lines (TTDLs), which can introduce multiple progressive time delays, are one of the basic building blocks of microwave photonic systems. Offering intrinsically low loss, ultra-wide operation bandwidth, and strong immunity to electromagnetic interference, photonic TTDLs have wide applications for phased array antennas (PAAs), microwave photonic filters, analog-to digital or digital-to-analog conversion, and arbitrary waveform generation. Here, we demonstrate significantly improved performance of a microwave photonic TTDL based on optical micro-comb generated by an integrated microring resonator with a free spectral range (FSR) of ~49 GHz, which performs as a highquality multi-wavelength source for the TTDL. The broadband (>100 nm) optical micro-comb achieved with a record low FSR of 49 GHz results 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 photonic processing. As compared with conventional TTDLs implemented by discrete laser arrays, the system cost, size, and complexity of our TTDL can be significantly reduced. We investigate the performance of a phased array antenna based on our TTDL and show that the large channel count leads to a high angular resolution and wide tuning range of the beam steering angle. This demonstrates the feasibility of our approach as a competitive solution toward implementing integrated photonic true time delays in radar and communications systems.

Paper Details

Date Published: 4 March 2019
PDF: 8 pages
Proc. SPIE 10921, Integrated Optics: Devices, Materials, and Technologies XXIII, 1092103 (4 March 2019); doi: 10.1117/12.2508146
Show Author Affiliations
Jiayang Wu, Swinburne Univ. of Technology (Australia)
Xingyuan Xu, Swinburne Univ. of Technology (Australia)
Mengxi Tan, Swinburne Univ. of Technology (Australia)
Thach G. Nguyen, RMIT Univ. (Australia)
Sai T. Chu, City Univ. of Hong Kong (Hong Kong, China)
Brent E. Little, Xi'an Institute of Optics and Precision Mechanics (China)
Roberto Morandotti, Institut National de la Recherche Scientifique (Canada)
National Research Univ. of Information Technologies, Mechanics and Optics (Russian Federation)
Univ. of Electronic Science and Technology of China (China)
Arnan Mitchell, RMIT Univ. (Australia)
David Moss, Swinburne Univ. of Technology (Australia)

Published in SPIE Proceedings Vol. 10921:
Integrated Optics: Devices, Materials, and Technologies XXIII
Sonia M. García-Blanco; Pavel Cheben, Editor(s)

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