An array of nonlinear gain elements in a coupled waveguide self-synchronizes at a frequency set by an exceptional point of degeneracy, with nonvanishing saturated gain per element.
The solution of some perturbation problems for matrices and selfadjoint or non-selfadjoint differential equations i,
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Array oscillator in coupled waveguides with nonlinear gain and radiation resistances saturating at exceptional point
An array of nonlinear gain elements in a coupled waveguide self-synchronizes at a frequency set by an exceptional point of degeneracy, with nonvanishing saturated gain per element.