COMBINING CODE-DIVISION MULTIPLEXING AND COHERENCE MULTIPLEXING FOR PRIVATE COMMUNICATIONS IN OPTICAL-FIBER MULTIPLE-ACCESS NETWORKS

An optical fiber multiple access network based on the combination of C ode Division Multiplexing and Coherence Multiplexing is presented. Sel f-homodyne detection is employed and bipolar codes are used. This sche me offers high security in communication and is suggested for network applications where security is of primary interest. Due to the combina tion of the two multiplexing schemes, the network can support a larger number of addresses than each multiplexing scheme individually with t he number of active users being limited to that of a classical Coheren ce Multiplexing system. The network is described theoretically and dem onstrated experimentally.