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We realize parity-time symmetry in a coupled active-passive microcavity system with balanced gain and loss. On-chip nonreciprocal light transmission and circulation due to gain-saturation nonlinearity are experimentally demonstrated with superior performance in high-Q microcavity systems.
We demonstrate that four-level atomic media provide a versatile platform for realizing parity-time (PT) symmetric optical potentials. The peculiar propagation dynamics emerging from such arrangements are examined both below and above the PT threshold.
A dual pumped L-band erbium-doped fiber amplifier (DPLB-EDFA) is investigated by solving the optical propagation equation that takes into account radial effects of the fiber and the rate equation in a steady-state two-level model with a weakly guided approximation. Applying an inversing method and a genetic algorithm, the DPLB-EDFA is optimized for dual pumped wavelengths and directions, fiber lengths,...
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