Finite Shift-Invariant Optical Orthogonal Codes for Quasi-Synchronous Communication Systems

This paper considers a distribution/aggregation network that employs optical code division multiple access (OCDMA) to transmit information to a head-end node in a metropolitan area network. The head-end node transmits synchronization pulses and the nodes employ ranging techniques to offset the propagation delay, resulting in a quasi-synchronous reception at the receiver. The paper develops a methodology to design orthogonal OCDMA codes for such quasi-synchronous communication systems. The paper also describes the receiver design and computes the bit error rate of such systems.