Simultaneous all-optical basic arithmetic operations using QD-SOA-assisted Mach–Zehnder interferometer

Abstract

All-optical logic and arithmetic operations are expected to play an important role in high-speed communication systems. In this paper, we have presented a model to perform two basic arithmetic operations (addition/subtraction) on two binary digits based on a quantum dot semiconductor optical amplifier (QD-SOA)-assisted MachZehnder interferometer. Using two QD-SOA-based switches, we have designed a half adder/subtractor circuit. The main advantage of this circuit is that simultaneous addition and subtraction operations are realized at the outputs. This circuit is designed theoretically and verified through numerical simulations. The theoretical study is carried out by taking into account the effect of amplified spontaneous emission. The dependence of the peak data power and that of the QD-SOA current density and length on the ER and Q factor of the switching outcome are explored and assessed by means of numerical simulations. The desirable device parameters has been examined in order to obtain the optimum best performance.Keywords Quantum dot semiconductor optical amplifier · Mach-Zehnder interferometer · All-optical signal processing · All-optical arithmetic operation B Tanay Chattopadhyay

Alternative approach to design Dibit-based XOR and XNOR gate

“…3, 4, 5 & 6. In 24 ps, we applied '1' (with soliton pulse) in A 1 and '0' (without soliton pulse) For the proposed XOR and XNOR gates, we have calculated the quality factor (Q) [20,25,26], extinction ratio (ER) [20,25,26], contrast ratio (CR) [20,25], and bit-error rate (BER) [20,25] of the output signals, and these given in Table III. We have also done a comparative study with the proposed design.…”