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In this paper, a rigorous performance analysis of optical CDMA (OCDMA) systems is presented for three different structures. These structures are on-off orthogonal (OOO), on-off orthogonal with single optical hard limiter (OOO-SHL) and on-off orthogonal with double optical hard limiters (OOO-DHL). For each of the above schemes two types of receiver structures is evaluated. The approximation for an...