A system-on-chip microwave photonic processor solves dynamic RF interference in real time with picosecond latency

Weipeng Zhang; Joshua C. Lederman; Thomas Ferreira de Lima; Jiawei Zhang; Simon Bilodeau; Leila Hudson; Alexander Tait; Bhavin J. Shastri; Paul R. Prucnal

doi:10.1038/s41377-023-01362-5

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A system-on-chip microwave photonic processor solves dynamic RF interference in real time with picosecond latency

Original Articles

- A system-on-chip microwave photonic processor solves dynamic RF interference in real time with picosecond latency
- Light: Science & Applications Vol. 13, Issue 1, Pages: 91-102(2024)
- Affiliations：
  
  1.Department of Electrical and Computer Engineering, Princeton University, Princeton 08544 NJ, USA
  2.NEC Laboratories America, Princeton 08540 NJ, USA
  3.Department of Electrical and Computer Engineering, Queen's University, Kingston K7L 3N6 Ontario, Canada
  4.Department of Physics, Engineering Physics and Astronomy, Queen's University, Kingston K7L 3N6 Ontario, Canada
- Author bio：
  
  Weipeng Zhang (weipengz@princeton.edu)
  Paul R. Prucnal (prucnal@princeton.edu)
- Funds：
- DOI：10.1038/s41377-023-01362-5
  CLC：
- Received：10 August 2023，
  
  Revised：12 December 2023，
  
  Accepted：2023-12-15，
  
  Published Online：09 January 2024，
  
  Published：31 January 2024
- Accepted：
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Zhang, W. P. et al. A system-on-chip microwave photonic processor solves dynamic RF interference in real time with picosecond latency.,Light: Science & Applications, 13, 91-102 (2024).
DOI：

Zhang, W. P. et al. A system-on-chip microwave photonic processor solves dynamic RF interference in real time with picosecond latency.,Light: Science & Applications, 13, 91-102 (2024). DOI： 10.1038/s41377-023-01362-5.

摘要

Abstract

Radio-frequency interference is a growing concern as wireless technology advances

with potentially life-threatening consequences like interference between radar altimeters and 5 G cellular networks. Mobile transceivers mix signals with varying ratios over time

posing challenges for conventional digital signal processing (DSP) due to its high latency. These challenges will worsen as future wireless technologies adopt higher carrier frequencies and data rates. However

conventional DSPs

already on the brink of their clock frequency limit

are expected to offer only marginal speed advancements. This paper introduces a photonic processor to address dynamic interference through blind source separation (BSS). Our system-on-chip processor employs a fully integrated photonic signal pathway in the analogue domain

enabling rapid demixing of received mixtures and recovering the signal-of-interest in under 15 picoseconds. This reduction in latency surpasses electronic counterparts by more than three orders of magnitude. To complement the photonic processor

electronic peripherals based on field-programmable gate array (FPGA) assess the effectiveness of demixing and continuously update demixing weights at a rate of up to 305 Hz. This compact setup features precise dithering weight control

impedance-controlled circuit board and optical fibre packaging

suitable for handheld and mobile scenarios. We experimentally demonstrate the processor's ability to suppress transmission errors and maintain signal-to-noise ratios in two scenarios

radar altimeters and mobile communications. This work pioneers the real-time adaptability of integrated silicon photonics

enabling online learning and weight adjustments

and showcasing practical operational applications for photonic processing.

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references

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