Abstract
This work introduces a new class of PT-symmetry grating assisted devices for switching or modulation applications. Their operation is based on a four-wave interaction, thus marking a step forward in the development of PT-symmetry devices which currently are essentially based on two-wave interactions. A remarkable feature of the new structure is that all its properties also hold in the case of imperfect PT-symmetry operation, corresponding to the important practical case of fixed losses.
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