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Experiment on Optical Code-Division-Multiple-Access Switch System Using Spectral Amplitude Encoding of Light-Emitting Diodes

  • Lucie Adam
  • Eli Simova
  • Mohsen Kavehrad

Abstract

Significant research is directed toward developing fiber-optic local distribution networks providing high data rate transmission in the local end of the backbone network. Code-Division Multiple-Access (CDMA) technique is capable of utilizing the optical channel bandwidth to provide simultaneous asynchronous access. Time-encoded optical CDMA systems can be classified according to the type of encoding, coherent or incoherent. Incoherent time-domain CDMA has advantages of direct detection and low-cost low-coherence optical sources1–3. Coherent time-domain encoding is more difficult to implement4. Such systems with low-coherence sources have also been proposed5. For time-encoded CDMA, the code length increases with the number of users and spectrum broadening occurs. To overcome the drawbacks of time-encoded CDMA, frequency-encoded systems have emerged based on coherent phase coding of ultrashort pulses6. Users operate at data rates compatible with the electronics, but high-cost mode-locked lasers are required. An optical CDMA system based on incoherent amplitude encoding of low-cost light-emitting diodes (LEDs) and direct-detection receivers has been proposed by D. Zaccarin and M. Kavehrad7–8. A comprehensive overview of the optical CDMA systems has been introduced by K. Iversen9.

Keywords

CDMA System Optical Code Division Multiple Access Optical Transfer Function Spatial Frequency Domain High Data Rate Transmission 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1997

Authors and Affiliations

  • Lucie Adam
    • 1
  • Eli Simova
    • 1
  • Mohsen Kavehrad
    • 1
  1. 1.Electrical Engineering DepartmentUniversity of OttawaOttawaCanada

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