Abstract
Spread spectrum is a modulation technique where the signal occupies a bandwidth much larger than the minimum necessary to send the information. An all-optical Manchester and Gold code generators are implemented using terahertz optical asymmetric demultiplexer-based D flip-flop and exclusive-OR logic gates in a configuration exactly like the standard electronic setup. The all-optical nonreturnable zero-to-Manchester conversion is implemented in our simulation system, and bit error rate performance (10 Gbit/s) of the format conversion is explained. Transmission performances of the converted Manchester-coded signal are addressed with the transmission length and received optical power. The proposed Manchester and Gold code generators scheme has been theoretically demonstrated in this paper. We are assigned distinguishable unique codes with low cross-correlation values among each other in multiuser environment. The Gold sequences are an important class of sequences which allow construction of long sequences with three-valued cross-correlation function. The Gold sequences are created from pairs of preferred m-sequences of the same length by modulo-2 addition. The performances of those proposed optical designs are evaluated by numerical simulation that confirms its feasibility in terms of the choice of the critical parameters.
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