[1] W. Shieh, X. Yi, Y. Ma, and Q. Yang, J. O. Networking 7, 234 (2008).
[2] X. Liu and F. Buchali, Opt. Express 16, 21944. (2008)
[3] S. L. Jansen, I. Morita, T. C.W. Schenk, and H. Tanaka1, 7, 173 (2008)
[4] C. R. S. Fludger, T. Duthel, D. van den Borne, C. Schulien, E.-D. Schmidt, T. Wuth, E. de Man, G. D. Khoe, and H. de Waardt, in Proceedings of Optical Fiber Communication Conference (OFC), 2007, PDP 22 (2007).
[5] Y. Tang and W. Shieh, Electron. Lett. 44, 588 (2008).
[6] X. Yi, W. Shieh, and Y. Tang, Photon. Technol. Lett. 19, 919 (2007).
[7] W. Shieh and C. Athaudage, Electron. Lett. 42, 587 (2006).
[8] W. Shieh, X. Yi, Y. Ma, and Y. Tang, Opt. Express 15, 9936 (2007).
[9] W. Shieh, H. Bao, and Y. Tang, Opt. Express 16, 841 (2008).
[10] A. J. Lowery, S. Wang, and M. Premaratne, Express 15, 13282 (2007).
[11] A. J. Lowery, Opt. Express 15, 12965 (2007).
[12] X. Liu, Y. Qiao, and Y. Ji, Chin. Opt. Lett. 9, 30602 (2011).
[13] X. Liu, Y. Qiao, and Y. Ji, Opt. Commun. 283, 2749 (2010).