In a CPT-symmetric dual-core Kerr coupler with dispersive coupling, degenerate four-wave mixing admits four branch configurations, and near the exceptional point one pump simultaneously satisfies two distinct sideband resonances.
(A1) becomes 2t2 + 2E0 +E + +E − = 0, which is impossible because every term is nonnegative andt >0
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Degenerate four-wave mixing in a CPT-symmetric coupler with intermodal dispersion
In a CPT-symmetric dual-core Kerr coupler with dispersive coupling, degenerate four-wave mixing admits four branch configurations, and near the exceptional point one pump simultaneously satisfies two distinct sideband resonances.