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. 2017 May 12;8:15389. doi: 10.1038/ncomms15389

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(a) Emission spectrum of a single ring resonator when the two SOAs inside the microring resonator are driven by an injection current of 21 mA each. (b) Single-mode spectrum under the PT-symmetry condition. The SOAs in the upper ring resonator are not activated, and the SOAs in the lower ring resonator are driven by an injection current of 21 mA each. The mode suppression ratio is 36.07 dB. (c) The optical spectrum at the other output of the laser showing the counter propagating modes and the counter propagating mode at the lasing frequency is marked with a dashed circle.