Code Division Multiple-Access Techniques in Optical Fiber Networks—Part I: Fundamental Principles

ArticleinIEEE Transactions on Communications 37(8):824 - 833 · September 1989with176 Reads
Impact Factor: 1.99 · DOI: 10.1109/26.31181 · Source: IEEE Xplore

    Abstract

    An examination is made of fiber-optic code-division
    multiple-access (FO-CDMA), a technique in which low information data
    rates are mapped into very-high-rate address codes (signature sequences)
    for the purpose of achieving random, asynchronous communications free of
    network control, among many users. The need for a special class of
    signature sequences to achieve the multiple-access capability using
    fiber-optic signal processing techniques is discussed. A class of
    signature sequences called optical orthogonal codes (OOCs) that provide
    the auto- and cross-correlation properties required for FO-CDMA is
    introduced and used in an experiment to show the principles of FO-CDMA.
    The experiment demonstrates the auto- and cross-correlation properties
    of the codes. The concept of optical disk patterns, an equivalent way of
    representing the OOCs, is introduced. The patterns are used to derive
    the probability density functions associated with any two interfering
    OOCs. A detailed study of different interference patterns is presented,
    and the strongest and the weakest interference patterns are determined