We show that Fano resonances created by twoPT -symmetric nonlinear micro-resonators coupled to a waveguide, have line-shape and resonance position that depends on the direction of the incident light. We utilize these features in order to induce asymmetric transport, up to 47 dBs, in the optical C-window. Our theoretical proposal requires low input power and does not compromise the power or frequency characteristics of the output signal.
F. Nazari, et. al., (2014) Optical isolation via PT -symmetric nonlinear Fano resonances.Optics Express22:89574. DOI: http://doi.org/10.1364/OE.22.009574