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(a) The schematic diagram of the microring laser consisting of two coupled rings and a bypass waveguide. (b) A photograph of the fabricated microring laser prototype with a scale bar of 200 μm. (c) A photograph of the laser wire bonded to a customized carrier for experimental test with a scale bar of 1 mm. MMI-C, multimode interference coupler; PM, phase modulator; SOA, semiconductor optical amplifier; TC, tunable coupler.
