Optical Code Division Multiplexing (OCDMA)

Examining network-wide architectures and protocols to support shared use of network resources.

The Optical CDMA project explores new approaches to the design of an Optical CDMA Local Area Network. This includes

  • Network protocols and management tools required for interconnected OCDMA LANs
  • Optimal 2-D scrambling codes structured to take advantage of the benefits optics provides while being robust to its limitations
  • OCDMA system design and implementation including a detailed experimental analysis of the effects of fiber-based impairments on an OCDMA signal and demonstrations of novel networking functions
  • Device fabrication and integration of micro-ring resonator array structures, thereby enabling reconfigurable and scalable OCDMA encoders and decoders.

People

Joseph Bannister

Joe Touch

Purushotham Kamath

Collaborators

Optical communications lab at USC

Compound Semiconductor Lab

MicroPhotonics Devices Group

Background

Report on Optical CDMA

 

Basics of spread spectrum

Notes on coding theory

Key Technologies:

The Optical CDMA simulator allows simulation of a Local Area Network based on an Optical CDMA physical layer and an Interference Sensing Media Access Protocol.

Version 1.0
The software is available here.
The simulator documentation is available here.

Version 2.0
The software is available here.
The simulator documentation is available here.

Version 3.0
The software is available here.
The simulator documentation is available here.

Papers:

  • Code-cycle modulation
  • MAC protocol, revising interference sensing and interference avoidance for OCDMA
  • OCDMA code converter
    • D. Gurkan, S. Kumar, A. Sahin, A.Willner, K. Parameswaran, M. Fejer, D. Starodubov, J. Bannister, P. Kamath, and J. Touch, “All-Optical Wavelength and Time 2-D Code Converter for Dynamically-Reconfigurable OCDMA Networks Using a PPLN Waveguide,” in Optical Fiber Communication Conference (OFC), Mar 2003, pp. 9-11. [ bib | .pdf ]
  • Network architecture for OCDMA LANs
    • P. Kamath, J. D. Touch, and J. A. Bannister, “Optical CDMA Local Area Network Design Specification,” in ISI Technical Report ISI-TR-, April 2004. [ .pdf ]
    • P. Kamath, J. D. Touch, and J. A. Bannister “Optical CDMA Wide Area Network Design,” White paper,ISI Technical Report, April 2005 [ .pdf ]
  • ——
  • Local Area Network design
    [1] P. Kamath, J. D. Touch, and J. A. Bannister, “Optical CDMA Local Area Network Design Specification,” in ISI Technical Report ISI-TR-, April 2004.
    [ .pdf ]
    [2] P. Kamath, J. D. Touch, and J. A. Bannister, “Interference Avoidance in Optical CDMA Networks,” in IEEE Infocom Student Workshop, March 2005.
    [ .pdf ]
    [3] P. Kamath, J. D. Touch, and J. A. Bannister, “Algorithms for Interference Sensing in Optical CDMA Networks,” in IEEE International Conference on Communications (ICC), June 2004.
    [ bib | .pdf ]
    [4] P. Kamath, J. D. Touch, and J. A. Bannister, “The Need for Media Access Control in Optical CDMA Networks,” in IEEE Infocom, March 2004.
    [ bib | .pdf ]
    Wide Area Network design
    [1] D. Gurkan, S. Kumar, A. Sahin, A.Willner, K. Parameswaran, M. Fejer, D. Starodubov, J. Bannister, P. Kamath, and J. Touch, “All-Optical Wavelength and Time 2-D Code Converter for Dynamically-Reconfigurable OCDMA Networks Using a PPLN Waveguide,” in Optical Fiber Communication Conference (OFC), Mar 2003, pp. 9-11.
    [ bib | .pdf ]
    [2] P. Kamath, J. D. Touch, and J. A. Bannister “Optical CDMA Wide Area Network Design,” White paper,ISI Technical Report, April 2005
    [ .pdf ]