[1] J. J. Vegas Olmos, T. Kuri, K.-i. Kitayama. IEEE Trans. Microwave Theory Tech., 58, 3001(2010).

[2] C. Liu, L. Zhang, M. Zhu, J. Wang, L. Cheng, G.-K. Chang. J. Lightwave Technol., 31, 2869(2013).

[3] Á. Morales, I. T. Monroy, F. Nordwall, T. Sørensen. Chin. Opt. Lett., 16, 040603(2018).

[4] I. G. Insua, D. Plettemeier, C. G. Schäffer. J. Lightwave Technol., 28, 2289(2010).

[5] O. Omomukuyo, M. P. Thakur, J. E. Mitchell. IEEE Photon. Technol. Lett., 25, 268(2013).

[6] Y. Chen, T. Shao, A. Wen, J. Yao. Opt. Lett., 39, 1509(2014).

[7] X. Chen, J. Yao. Chin. Opt. Lett., 15, 010008(2017).

[8] R. Zhang, J. Ma. Opt. Switch. Netw., 25, 33(2017).

[9] R. Taylor, S. Forrest. J. Lightwave Technol., 17, 556(1999).

[10] X. Li, Z. Dong, J. Yu, J. Zhang, L. Tao, Y. Shao, N. Chi. Optical Fiber Communication Conference and Exposition and National Fiber Optic Engineers Conference, OW1D.3(2013).

[11] H. Wang, L. Yan, J. Ye, B. Luo, W. Pan, X. Zou, P. Li. Chin. Opt. Lett., 15, 112301(2017).

[12] T. Kuri, K.-i. Kitayama. J. Lightwave Technol., 21, 3167(2003).

[13] C.-T. Lin, P.-T. Shih, W.-J. Jiang, E.-Z. Wong, J. J. Chen, S. Chi. Opt. Lett., 34, 2171(2009).

[14] X. Chen, J. Yao. J. Lightwave Technol., 34, 2789(2016).

[15] M. G. Taylor. European Conference on Optical Communication, 263(2005).

[16] V. C. Duarte, M. V. Drummond, R. N. Nogueira. J. Lightwave Technol., 34, 5566(2016).

[17] H. Shams, M. J. Fice, L. Gonzalez-Guerrero, C. C. Renaud, F. van Dijk, A. J. Seeds. J. Lightwave Technol., 34, 4786(2016).

[18] H. Kim, T. T. Pham, Y. Won, S. Han. J. Lightwave Technol., 27, 2744(2009).

[19] X. Pang, M. Beltrán, J. Sánchez, E. Pellicer, J. J. Vegas Olmos, R. Llorente, I. T. Monroy. J. Opt. Commun. Netw., 6, 1(2014).

[20] C. T. Lin, S. C. Chiang, C. H. Li, H. T. Huang, C. H. Lin, B. J. Lin. Opt. Lett., 42, 207(2017).