[3] G. C. Valley. Opt. Express, 15, 1955(2007).
[4] J. W. Lou, T. F. Carruthers, M. Currie. IEEE Photon. Technol. Lett., 16, 51(2004).
[5] F. Wan, Z. Wang. Chin. Opt. Lett., 4, 339(2006).
[7] M. Mielke, G. A. Alphonse, P. J. Delfyett. IEEE J. Sel. Areas Commun., 25, 120(2007).
[8] L. Hou, M. Haji, B. C. Qiu, A. C. Bryce. IEEE Photon. Technol. Lett., 23, 1064(2011).
[9] S. Liu, D. Lu, R. Zhang, L. Zhao, W. Wang, R. Broeke, C. Ji. Opt. Express, 24, 9734(2016).
[11] Y. Takushima, K. Kikuchi. IEEE Photon. Technol. Lett., 11, 322(1999).
[12] C. Gordón, R. Guzmán, X. Leijtens, G. Carpintero. Photon. Res., 3, 15(2015).
[13] L. Hou, M. Haji, A. E. Kelly, J. M. Arnold, A. C. Bryce. IEEE Photon. Technol. Lett., 23, 1064(2011).
[14] L. Hou, I. Eddie, J. H. Marsh. Conference on Lasers and Electro Optics, STh4L.2(2016).
[15] W. Zhao, L. Guo, H. Wang, G. Chen, D. Lu, L. Zhao. Asia Communications and Photonics Conference, 1(2018).
[17] L. Hou, M. Haji, J. Akbar, B. C. Qiu, A. C. Bryce. Opt. Lett., 36, 966(2011).