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One photon-per-bit receiver using near-noiseless phase-sensitive amplification.

Ravikiran Kakarla1, Jochen Schröder1, Peter A Andrekson1

  • 1Photonics Laboratory, Department of Microtechnology and Nanoscience (MC2), Chalmers University of Technology, 412-96 Gothenburg, Sweden.

Light, Science & Applications
|September 18, 2020
PubMed
Summary
This summary is machine-generated.

Future space communication needs faster speeds. We demonstrate a novel phase-sensitive optical amplifier receiver achieving 1 photon-per-information-bit sensitivity at 10.5 Gb/s, enabling high-speed, high-sensitivity free-space links.

Keywords:
Fibre optics and optical communicationsNonlinear optics

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Area of Science:

  • Optical communication systems
  • Free-space optical links
  • Advanced receiver technology

Background:

  • Deep-space missions require high-speed data connectivity, currently limited by transmission power, aperture size, and receiver sensitivity.
  • Transitioning from radio-frequency to optical links significantly reduces diffraction-induced channel loss.
  • Existing photon-counting receivers operate below 1 Gb/s, necessitating more advanced solutions for multi-Gb/s rates.

Purpose of the Study:

  • To explore the potential of phase-sensitive optical amplifiers (PSAs) for ultra-sensitive free-space optical communication.
  • To demonstrate a PSA-based receiver capable of achieving unprecedented sensitivity at high data rates.
  • To assess the feasibility of using PSAs for future high-bandwidth space communication.

Main Methods:

  • Implemented a free-space transmission experiment utilizing a novel PSA-based receiver.
  • Employed quadrature-phase-shift keying (QPSK) modulation for signal encoding.
  • Integrated standard digital signal processing for signal recovery and forward-error correction.

Main Results:

  • Achieved a bit-error-free, black-box sensitivity of 1 photon-per-information-bit (PPB).
  • Demonstrated successful data transmission at an information rate of 10.5 Gb/s.
  • Verified the system's straightforward scalability to higher data rates.

Conclusions:

  • Phase-sensitive optical amplifiers offer a unique 0 dB noise figure, enabling superior sensitivity for free-space links.
  • The demonstrated PSA-based receiver system achieves record sensitivity at multi-Gb/s rates, surpassing previous limitations.
  • This technology is a promising solution for future high-speed, long-haul free-space optical communication.