Realization of All-Optical NOR Gate at 10-Gb/s by Cascading OR and NOT Gates

The authors have developed, simulated and analyzed the performance of SOA-based all-optical OR and NOT gates at 10 Gbps. Furthermore, the all-optical NOR gate has been designed and its implementation has been done successfully by cascading OR with NOT gate. The proposed design is simpler in structure and offers flexibility in wavelength selection. Also, it allows scope for photonic integration which is imperative to realize higher level components like half-adder, full-adder etc. In comparison to previously postulated works, SOA based gates offer wide bandwidth and simplicity in structure. Also, majority of the designs in literature work upto 10 Gbps. However, the proposed design of OR, NOT and NOR gates can be operated upto 30 Gbps.