[1] J. Capmany, D. Novak. Nat. Photon., 1, 319(2007).
[2] J. Yao. J. Lightwave Technol., 27, 314(2009).
[3] K. Xu, R. Wang, Y. Dai, F. Yin, J. Li, Y. Ji, J. Lin. Photon. Res., 2, B54(2014).
[4] J. Li, T. Ning, L. Pei, J. Zheng, J. Sun, Y. Li, J. Yuan. Chin. Opt. Lett., 13, 080606(2015).
[5] F. Li, Z. Cao, X. Li, Z. Dong, L. Chen. J. Lightwave Technol., 31, 2394(2013).
[8] L. Zhao, J. Yu. Chin. Opt. Lett., 13, 060601(2015).
[10] Y. Bao, Z. Li, J. Li, X. Feng, B. O. Guan, G. Li. Opt. Express, 21, 7354(2013).
[11] D. Lam, A. M. Fard, B. Buckley, B. Jalali. Opt. Lett., 38, 446(2013).
[13] S. Li, X. Zheng, H. Zhang, B. Zhou. IEEE Photon. Tech. Lett., 22, 1775(2010).
[14] W. Jiang, Q. Tan, W. Qin, D. Liang, X. Li, H. Ma, Z. Zhu. IEEE Photon. J., 7, 1(2015).
[15] J. Perez, R. Llorente. Opt. Commun., 318, 212(2014).
[16] B. Masella, B. Hraimel, X. Zhang. J. Lightwave Technol., 27, 3034(2009).
[17] X. Chen, W. Li, J. Yao. IEEE Photon. Tech. Lett., 25, 1373(2013).
[18] D. Zhu, J. Chen, S. Pan. Opt. Express, 24, 11009(2016).
[19] G. Zhang, X. Zheng, S. Li, H. Zhang, B. Zhou. Opt. Lett., 37, 806(2012).
[20] X. Zheng, G. Zhang, S. Li, H. Zhang, B. Zhou. Chin. Sci. Bull., 59, 2655(2014).
[21] J. Li, Y. C. Zhang, S. Yu, W. Gu. IEEE Photon. J., 6, 1(2014).
[22] J. Chen, D. Zhu, S. Pan. 2016 25th Wireless and Optical Communication Conference (WOCC)(2016).
[23] Z. Li, S. Li, X. Zheng, J. Luo, H. Zhang, B. Zhou. Optoelectronics and Communications Conference (OECC) Held Jointly with 2016 International Conference on Photonics in Switching (PS)(2016).
[24] A. D. Simard, B. Filion, D. Patel, D. Plant, S. LaRochelle. Opt. Express, 24, 19467(2016).
[25] Y. Cui, Y. Dai, F. Yin, J. Dai, K. Xu, J. Li, J. Lin. Opt. Express, 21, 23433(2013).