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Optical fiber multiple access systems employing spread spectrum technique for local area networks

In this paper we present a novel optical fiber multiple access system based on the combination of Coherence Multiplexing (CM) and Spread Spectrum techniques. By exploiting the coherence properties of the source, a reference signal is transmitted along with an encoded signal to achieve self-homodyne detection, so bipolar codes can be used. At the receiver, the desired signal can be recovered using the same code as the transmitter. This is the CDMA principle. This scheme offers security in communication and is suggested for network applications where security is of interest. Due to combination of the two multiplexing schemes, i.e. CM and CDMA the network can support a larger number of subscribers than each multiplexing scheme individually. This system is described and demonstrated experimentally.