Demonstration of an all-optical OCDMA encryption and decryption system with variable two-code keying

Natalie Kostinski, Konstantin Kravtsov, Paul R. Prucnal

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


We demonstrate the first all-optical optical code-division multiple-access (OCDMA) encryption and decryption system with variable two-code keying. The nonlinear optical loop mirror (NOLM)-based exclusive or (xor) employed in encryption utilizes the shortest length silica-based nonlinear fiber element to date, enabling a compact architecture. Fiber Bragg grating arrays create wavelength-hopping time-spreading OCDMA codes from broadband pulses at output ports of the xor resulting in variable two-code keying, a code-switching modulation format characterized by a random alternation in bit representation and immunity to differential analysis unlike fixed two-code keying. The terahertz optical asymmetric demultiplexer employed in decryption shows mutual compatibility of nonlinear fiber-based and semiconductor optical amplifier-based NOLM configurations. Our architecture can potentially perform one-time pad encryption and decryption for unconditional security.

Original languageEnglish (US)
Pages (from-to)2045-2047
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number24
StatePublished - Dec 15 2008

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


  • Heavily doped fiber (HDF)
  • Optical code-division multiple-access (OCDMA)
  • Optical logic
  • Security
  • Variable two-code keying


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