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We demonstrate experimentally that stable single longitudinal mode operationcan be readily achieved in PT-symmetric arrangements of coupled microringresonators. Whereas any active resonator is in principle capable of displayingsingle-wavelength operation, selective breaking of PT-symmetry can be utilizedto systematically enhance the maximum achievable gain of this mode, even if alarge number of competing longitudinal or transverse resonator modes fallwithin the amplification bandwidth of the inhomogeneously broadened activemedium. This concept is robust with respect to fabrication tolerances, and itsmode selectivity is established without the need for additional components orspecifically designed filters. Our results may pave the way for a newgeneration of versatile cavities lasing at a desired longitudinal resonance.Along these lines, traditionally highly multi-moded microring resonatorconfigurations can be fashioned to suppress all but one longitudinal mode.

PT-symmetric microring lasers: Self-adapting broadband mode-selective resonators