AND gate based on two-photon absorption in semiconductor optical amplifier

An all-optical logic AND gate based on two-photon absorption (TPA) in semiconductor optical amplifier (SOA) is simulated. By solving the rate equations of SOA in the form of a Mach-Zehnder interferometer (MZI), the performance of AND gate is numerically investigated. The model takes the effects of amplified spontaneous emission (ASE) and pulse energy on the system’s quality factor (Q-factor) into account. Results show that the all-optical AND gate based on TPA in SOA-MZI based structure is feasible at 250 Gbit/s with a proper Q-factor.     

1 Tb/s high quality factor NAND gate using quantum-dot semiconductor optical amplifiers in Mach–Zehnder interferometer

The performance of all-optical logic NAND gate realized by employing quantum-dot semiconductor optical amplifiers (QD-SOAs)-based Mach–Zehnder interferometers (MZI) is numerically simulated. Boolean NAND operation is achieved by a series combination of properly configured and driven QD-SOAs-MZIs. The theoretical study is carried out by taking into account the effect of amplified spontaneous emission. The dependence of the output \(Q\) -factor on data signals and QD-SOA parameters is investigated and discussed. The obtained results indicate that the NAND gate is capable of operating at 1 Tb/s with high output quality factor ( \(Q\) -factor) provided that these parameters are properly optimized.     

All-optical logic NXOR based on semiconductor optical amplifiers with the effect of amplified spontaneous emission

The performance of all-optical logic NXOR gate based on semiconductor optical amplifiers Mach-Zehnder interferometer(SOAs-MZI)is simulated.The effects of amplified spontaneous emission(ASE)and the input pulse energy on the system’s quality factor are studied.For the parameters used,the all-optical logic gates using SOAs are capable of operating at speed of 80Gbit/s.