An integrated parity-time symmetric wavelength-tunable single-mode microring laser

Weilin Liu, Ming Li, Robert S. Guzzon, Erik J. Norberg, John S. Parker, Mingzhi Lu, Larry A. Coldren and Jianping Yao ()
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Weilin Liu: Microwave Photonics Research Laboratory, University of Ottawa
Ming Li: Microwave Photonics Research Laboratory, University of Ottawa
Robert S. Guzzon: University of California Santa Barbara
Erik J. Norberg: University of California Santa Barbara
John S. Parker: University of California Santa Barbara
Mingzhi Lu: University of California Santa Barbara
Larry A. Coldren: University of California Santa Barbara
Jianping Yao: Microwave Photonics Research Laboratory, University of Ottawa

Nature Communications, 2017, vol. 8, issue 1, 1-6

Abstract: Abstract Mode control in a laser cavity is critical for a stable single-mode operation of a ring laser. In this study we propose and experimentally demonstrate an electrically pumped parity-time (PT)-symmetric microring laser with precise mode control, to achieve wavelength-tunable single-mode lasing with an improved mode suppression ratio. The proposed PT-symmetric laser is implemented based on a photonic integrated circuit consisting of two mutually coupled active microring resonators. By incorporating multiple semiconductor optical amplifiers in the microring resonators, the PT-symmetry condition can be achieved by a precise manipulation of the interplay between the gain and loss in the two microring resonators, and the incorporation of phase modulators in the microring resonators enables continuous wavelength tuning. Single-mode lasing at 1,554.148 nm with a sidemode suppression ratio exceeding 36 dB is demonstrated and the lasing wavelength is continuously tunable from 1,553.800 to 1,554.020 nm.

Date: 2017
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DOI: 10.1038/ncomms15389

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