Sub-mA threshold 1.3 µm CW lasing from electrically pumped micro-rings grown on (001) Si

Y. Wan, J. Norman, Q. Li, M. J. Kennedy, D. Liang, C. Zhang, D. Huang, A. Y. Liu, A. Torres, D. Jung, A. C. Gossard, E. L. Hu, Kei May Lau and J. E. Bowers