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Securing Data in Multimode Fibers by Exploiting Mode-Dependent Light Propagation Effects.

Stefan Rothe1, Karl-Ludwig Besser2, David Krause1

  • 1TU Dresden, Faculty of Electrical and Computer Engineering, Laboratory of Measurement and Sensor System Technique, 01062 Dresden, Germany.

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|March 17, 2023
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Summary

Researchers demonstrated a novel method using multimode fibers to secure data transmission. This physical-layer security approach prevents eavesdropping by exploiting light properties, enhancing secure data exchange by 538 times.

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Area of Science:

  • Optical Communications
  • Quantum Information Science
  • Information Security

Background:

  • Multimode fibers offer high data rates but suffer from modal crosstalk and distortions.
  • Existing methods struggle to compensate for these distortions, limiting their practical application.
  • Physical-layer security offers a novel approach to secure communication channels.

Purpose of the Study:

  • To demonstrate the feasibility of using holographic measurement of the transmission matrix in multimode fibers for secure data transmission.
  • To experimentally validate a physical-layer-security approach against eavesdropping.
  • To quantify the enhancement in secure data exchange compared to uncoded transmissions.

Main Methods:

  • Holographic measurement of the transmission matrix to compensate for distortions.
  • Experimental demonstration on a multimode fiber link with a coupled eavesdropper.
  • Implementation of wiretap codes to quantify the level of secrecy.
  • Launching structured light fields to enable confidential communication.

Main Results:

  • Successful demonstration of a confidential data connection between Alice and Bob.
  • Decipherment for an eavesdropper (Eve) was destroyed.
  • Secure data exchange was enhanced by a factor of 538 compared to uncoded transmission.
  • Exploitation of complex light transportation phenomena for information security.

Conclusions:

  • Multimode fibers can be utilized for secure communication by harnessing complex light phenomena.
  • The demonstrated physical-layer-security approach offers a robust method against eavesdropping.
  • This research opens new perspectives for information security in spatial multiplexing communication systems.