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

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Area of Science:

  • Integrated photonics
  • Signal processing
  • Wireless communication

Background:

  • Advancing wireless technologies increase radio-frequency interference (RFI) risks, impacting critical systems like radar altimeters and 5G networks.
  • Conventional digital signal processing (DSP) faces latency challenges with high-frequency, high-data-rate signals, limiting performance.
  • Existing DSP solutions are nearing their clock frequency limits, offering minimal future speed improvements.

Purpose of the Study:

  • To introduce a photonic processor for addressing dynamic interference using blind source separation (BSS).
  • To demonstrate a system-on-chip solution with ultra-low latency for signal demixing.
  • To enable real-time adaptability and online learning in photonic signal processing for practical applications.

Main Methods:

  • Development of a system-on-chip photonic processor with a fully integrated analogue photonic signal pathway.
  • Implementation of blind source separation (BSS) for demixing mixed signals.
  • Integration with field-programmable gate array (FPGA) peripherals for real-time demixing weight updates (up to 305 Hz).

Main Results:

  • Achieved signal demixing and recovery in under 15 picoseconds, exceeding electronic methods by over three orders of magnitude.
  • Demonstrated experimental suppression of transmission errors and maintained signal-to-noise ratios in radar altimeter and mobile communication scenarios.
  • Showcased real-time adaptability with online learning and weight adjustments for the photonic processor.

Conclusions:

  • The photonic processor offers a viable, ultra-low-latency solution for mitigating dynamic radio-frequency interference in wireless systems.
  • Integrated silicon photonics demonstrate practical operational capabilities for real-time signal processing.
  • This technology paves the way for future advancements in high-speed, interference-resilient wireless communication.