Abstract:Semiconductor ring lasers have attracted remarkable interest as laser sources in photonic integrated circuits. They result in bidirectional laser owing to the rotation symmetry between the two counter-propagating modes of the ring cavity. This symmetry can be broken embedding an S-bend waveguide in the racetrack resonator, which generates an unbalanced loss mechanism and a non-reciprocal gain between clockwise and counterclockwise direction beams. The propagating field along the resonator in the undesirable di… Show more
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