<p>An efficient ultrafast all-optical arbitrary bit sequence generator (ABSG) with combined combinational and sequential logic capability embedded in a single structure is proposed in this manuscript. The essence of the present design lies in the fact that the design employs methods of ultrafast all-optical switching, which is achieved in an optimised micro-ring resonator (MRR) circuit using GaAs–AlGaAs non-linear material that is excited using an optical pumping technique. One of the important aspects of the proposed work is the utilisation of the inherent characteristics of MRR for designing the all-optical ABSG circuit. Such a method makes the design uniquely different and considerably easier to integrate with very large-scale integrated optics. The switching characteristics of MRR as well as the functionalities of the suggested all-optical ABSG are numerically modelled and verified through MATLAB simulations. The manuscript also covers a detail analysis of performance affecting parameters of the MRR unit, such as ring radius and coupling coefficients, to obtain their optimum values. The performance of the proposed ABSG is also estimated with the help of contrast ratio, extinction ratio, and amplitude modulation. These results confirm the potential of the proposed architecture as a scalable, energy-efficient building block for high-performance future high-speed photonic computing and communication systems.</p>