Reduction of optical beat interference in optical frequency-hopping CDMA networks using coherence multiplexing

K. Kamakura, I. Sasase

Research output: Contribution to journalConference articlepeer-review

4 Citations (Scopus)


In order to reduce the optical beat interference (OBI) in an optical frequency-hopping code division multiple access (FH-CDMA) network, we propose applying coherence multiplexing (CM) technique into the optical FH-CDMA network. Since the CM technique achieves multiplexing by using time delays exceeding the coherence time of the light sources, crosstalk between CM channels depends on a space of delay difference between CM channels. We analyze the ratio of crosstalk to signal as a function of the space, and find a channel space enough to neglect crosstalk from other CM channels. Using this channel space, we obtain the number of CM channels accommodated within one chip duration. Since the conventional FH-CDMA supports traffic by the code channels only, its capacity is limited by OBI as traffic increases. In addition to the code channel, the proposed network supports traffic by the CM channels. Since the addition of CM channels decreases the number of active code channels for uniform traffic, OBI is reduced. Numerical results show that the proposed network attains larger capacity than the conventional FH-CDMA.

Original languageEnglish
Pages (from-to)695-700
Number of pages6
JournalIEEE International Conference on Communications
Publication statusPublished - 2001 Jan 1
EventInternational Conference on Communications (ICC2001) - Helsinki, Finland
Duration: 2000 Jun 112000 Jun 14

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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