Performance analysis for various fiber-optic CDMA receiver structures

We compare various receiver structures for optical CDMA networks. Optical orthogonal codes (OOC) are utilized as signature sequences and the performance studied in this paper takes into account the effect of all major noise sources. The required mean number of photon count per chip time for reliable transmission of data bits for various receiver structures is investigated. Two general classes of receivers are investigated which use chip-time or bit-time electronic integration. The results show that receivers with chip-time integration have superior performance and therefore low-power transmission is possible at low speeds. However, the high-speed systems need bit-time integration and therefore should operate at higher levels of signal power.