RSOA-Based Reversible Logic Design: A Scalable Approach for Optical Gates and Multiplexers Using FRG Architecture

Abstract

In this study, the design of fundamental all-optical logic circuits using reversible Fredkin gate architectures implemented with Reflective Semiconductor Optical Amplifiers (RSOAs) is proposed and investigated. A 2×1 multiplexer (MUX) forms the foundational element, from which key logic operations NOT, AND, OR, NAND, NOR, XOR and XNOR are derived. Additionally, a 4×1 MUX, half-adder and a half-subtractor circuits are constructed to demonstrate the scalability of the approach for complex combinational logic. All designs operate using Gaussian pulse inputs, and the switching dynamics of the RSOA-based circuits are analysed in detail. To evaluate the optical signal quality and performance, critical metrics including the Extinction Ratio (ER), Contrast Ratio (CR), and Relative eye opening (REOP) are calculated. The results confirm that the proposed circuits offer high-speed operation, low energy consumption, and excellent signal integrity, highlighting their potential for application in integrated photonic logic, Fiber-optic communication systems, and next
generation optical computing architectures.