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.
Experimental Demonstration of a New Oscillator Concept Based on Degenerate Band Edge in Microstrip Circuit
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The first experimental demonstration of an oscillator based on a periodic, resonant microstrip circuit with a degenerate band edge (DBE) is presented. The DBE is a fourth-order exceptional degeneracy of the eigenmodes in a lossless periodic waveguide that is visible in the wavenumber-frequency dispersion diagram, and the periodic microstrip behaves as a frequency selective medium. The presence of the DBE condition and the associated DBE resonance allow for a stable, single-mode oscillation as well as stability with varying the load resistance.
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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.