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Related Experiment Video

Updated: Mar 28, 2026

Quasi-light Storage for Optical Data Packets
07:45

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

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Quantum secured gigabit optical access networks.

Bernd Fröhlich1, James F Dynes1, Marco Lucamarini1

  • 1Toshiba Research Europe Ltd, 208 Cambridge Science Park, Cambridge CB4 0GZ, UK.

Scientific Reports
|December 15, 2015
PubMed
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We demonstrate a new method enabling quantum key distribution (QKD) and high-speed data traffic to coexist in passive optical networks. This breakthrough supports multiple users, paving the way for secure quantum-protected networks.

Area of Science:

  • Quantum communication
  • Optical networking

Background:

  • Passive optical networks (PONs) are crucial for scaling quantum key distribution (QKD) networks.
  • Existing PON architectures with power splitters hinder weak quantum signal transmission, especially when multiplexed with data signals.
  • The imbalance between quantum signals and Raman noise in PONs can lead to complete signal loss.

Purpose of the Study:

  • To introduce a novel method for overcoming limitations in passive optical network architectures for QKD.
  • To demonstrate the coexistence of multi-user QKD and gigabit passive optical network (GPON) data traffic.
  • To validate a dual feeder implementation compatible with standard GPON.

Main Methods:

  • Development of a novel method to manage signal interference in passive optical networks.

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  • Implementation of a dual feeder system compatible with existing GPON infrastructure.
  • Demonstration of simultaneous transmission of QKD and full power data traffic.

    • Main Results:

    • Successfully demonstrated the coexistence of multi-user QKD and GPON data traffic.
    • The proposed method overcomes the signal imbalance caused by power splitters.
    • The dual feeder implementation supports up to 128 users.

    Conclusions:

    • The developed method enables secure quantum communication alongside standard data services in existing optical networks.
    • This approach is compatible with current GPON standards and offers scalability.
    • Quantum-protected GPON networks are feasible for future widespread adoption.