Abstract
We study the formation of longer-lived states via internal coupling near a special avoided resonance crossing between the interacting states in an open optical system. Away from the parity-time symmetry limit, we discuss unconventional cavity resonance states created by a spatially varying gain/loss profile. Now, via -matrix formalism, we have numerically demonstrated that with suitably chosen system openness and coupling strengths, the excess noise generation among the interacting nonorthogonal states (calculated as Petermann factor ) can be suppressed close to the ideal value of one with a simultaneous order of magnitude enhancement in the quality-factor of the longer-lived state.
© 2016 Optical Society of America
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