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Journal of Lightwave Technology

Journal of Lightwave Technology


  • Vol. 29, Iss. 14 — Jul. 15, 2011
  • pp: 2081–2088

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, and Prem Kumar

Journal of Lightwave Technology, Vol. 29, Issue 14, pp. 2081-2088 (2011)

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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.

© 2011 IEEE

Sarper Ozharar, Daniel R. Reilly, Shawn X. Wang, Gregory S. Kanter, and Prem Kumar, "Two-Dimensional Optical Code-Division Modulation With Quantum-Noise Aided Encryption for Applications in Key Distribution," J. Lightwave Technol. 29, 2081-2088 (2011)

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