Theoretical investigation of phase-based all-optical NOT, XOR and XNOR logic gates based on AlGaAs microring resonators

Abstract

We propose and numerically verify a phase-based all-optical logic gate (NOT, XOR and XNOR) operation scheme based on cascaded AlGaAs microring resonators. Phase control in this scheme depends on cross-phase modulation in the AlGaAs microring. The realization of NOT logic depends on the π phase shift of light transmission, and this π phase shift can be naturally obtained in microring resonators in the under-coupled state. Inputting a non-return zero intensity signal as pump light, the probe light (continuous wave) will experience a different phase shift and a phase-based logical function can be realized in this process. The bandwidth and the minimum power requirement of this scheme are also discussed in detail.