Two-dimensional optical code-division modulation with quantum-noise aided encryption for applications in key distribution

Sarper Ozharar*, Daniel R. Reilly, Shawn X. Wang, Gregory S. Kanter, Prem Kumar

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

We propose and demonstrate an advanced optical modulation format that makes use of both spectral and temporal phase encodings (2-D) for applications requiring exceptional security. The method combines modulation techniques used in direct-sequence spread-spectrum coding, spectral-phase encoding, and M-ary phase-shift keying with codes generated using cryptographically secure pseudorandom number generators. The wideband transmission signal is very difficult for an eavesdropper to record or analyze. Signal-to-noise ratio limitations imposed by quantum effects enhance the security further. The properties of the transmitted signal make it especially useful for physics-based key expansion systems. We have successfully used this setup to transmit encrypted 155 Mb/s data over 70 km of fiber with a BER value of 4E-5.

Original languageEnglish (US)
Article number5771023
Pages (from-to)2081-2088
Number of pages8
JournalJournal of Lightwave Technology
Volume29
Issue number14
DOIs
StatePublished - 2011

Keywords

  • Key Distribution
  • M-ary phase-shift keying
  • secure communication
  • spectral-phase encryption

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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