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The authors propose a network implementation with enhanced security at the physical layer by means of time-hopping CDMA, supporting cryptographically secure point-to-point and point-to-multipoint communication. In particular, they analyze an active star topology optical network implementation capable of supporting 128 simultaneous users up to 20 km apart. The feasibility of the proposed scheme is demonstrated through numerical simulation. Communication methods employed today in access optical networks are inherently insecure, as they do not provide privacy from a sufficiently motivated eavesdropper, as signals are broadcasted to all users, e.g., as in Passive Optical Networks (PONs).
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