Exceptional Point modulated by Kerr effect in Anti-Parity-Time Symmetry System

Recently, exceptional point (EP) constructed by anti-parity-time (APT) symmetry has been suggested to hold a vast real splitting in transmission spectrum. Yet, EP is prone to perturbations and lack of approaches to steer it. We demonstrate here that Kerr nonlinearity is incorporated to manipulate detuning, thus tuning EPs in APT configuration. Based on Kerr effect, a novel scheme is proposed to realize full optical manipulation of its EP, which is instantaneous and has better resistance against detuning errors. We also find that operating EPs by self-phase modulation will narrow eigenfrequency splitting while cross-phase modulation could enhance it. By judiciously managing stimulation of Kerr effect, our scheme could realize controllable EPs with larger frequency splitting.