All optical frequency encoded NAND logic operation along with the simulated result

Optical frequency encoding/decoding techniques are important in optical signal processing and communication because of its inherent advantages. There are several research works are already reported where this frequency encoding/decoding mechanism are successfully used to develop logic gates in optical domain. The frequency encoded logic gates can show very low bit error rate and with a very small optical power the logic operation can be conducted too. Here in this paper the authors report an all optical NAND logic gate using frequency encoding/decoding techniques successfully. At the same time the concept of frequency encoded controlled NAND logic is proposed here. The simulated results of the NAND logic are also reported in this paper. To implement the NAND operation non-linear activity of semiconductor optical amplifier (SOA) is exploited here for switching purpose. As a whole the whole logic gates perform its operation at a very high speed (greater than THz frequency). The simulated result of the operation also supports the theoretical prediction of the operation.