All-optical Manchester code generator using TOAD-based D flip-flop

An all-optical Manchester code generator is implemented using terahertz optical asymmetric demultiplexer based D flip-flop and exclusive-OR (XOR) logic gates in a configuration exactly like the standard electronic setup. There is 10 Gbit/s all-optical non return to zero--to-Manchester conversion implemented in our simulation system and bit error rate performance of the format conversion is investigated. Transmission performances of the converted Manchester coded signal are discussed in terms of transmission length and received optical power. The performance of the circuit is evaluated through numerical simulation, which confirms its feasibility in terms of the choice of the critical parameters. The proposed scheme has been theoretically demonstrated for a Manchester code generator.