Self-clocked all-optical add/drop multiplexer for asynchronous CDMA ring networks

Konstantin Kravtsov, Yanhua Deng, Paul R. Prucnal

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


In this paper, we demonstrate a novel self-clocked code-drop unit for incoherent optical code-division multiple-access (CDMA) networks. The unit is based on an all-optical thresholder with internal wavelength conversion that creates a control signal for the drop gate from the incoming data stream. This architecture does not require an external clock signal for drop operation and can be used in asynchronous ring networks. The proposed unit is experimentally demonstrated for two-dimensional time-wavelength optical CDMA codes at a bit rate of 2.5 Gbit/s with two different types of drop gates: Terahertz optical asymmetric multiplexer and nonlinear fiber-based loop mirror. Error-free operation is achieved in both configurations. The development of a self-clocked add/drop multiplexer demonstrates a novel concept of asynchronous node operation in multiple access networks.

Original languageEnglish (US)
Pages (from-to)396-401
Number of pages6
JournalIEEE Journal of Quantum Electronics
Issue number4
StatePublished - 2009

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


  • Add/drop multiplexer
  • Code-division multiple access (CDMA)
  • Optical fiber communications
  • Self-clocked operation


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