Effects of Laser Direct Intensity Modulation Index on Optical Beat Interference in Subcarrier Multiplexed Wavelength Division Multiple Access Networks

Mohammad M. Banat, Mohsen Kavehrad

    Research output: Contribution to journalArticlepeer-review

    3 Scopus citations

    Abstract

    Degradation in carrier-to-interference ratio (CIR) due to optical beat interference (OBI) in subcarrier multiplexed wavelength division multiple Access (SCM/WDMA) networks using direct photodetection is evaluated. The subcarriers are assumed to directly intensity modulate separate lasers. A large signal model for the modulated laser light is used. The discrepancy in CIR between this model and the small signal model commonly used in the literature is important at high modulation indices (4.5 dB at about unity modulation index). This justifies the introduction of the large signal model for analyzing OBI. It is found from analytical results that OBI is lower for higher intensity modulation indices.

    Original languageEnglish (US)
    Pages (from-to)1636-1643
    Number of pages8
    JournalIEEE Transactions on Communications
    Volume43
    Issue number234
    DOIs
    StatePublished - 1995

    All Science Journal Classification (ASJC) codes

    • Electrical and Electronic Engineering

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