[1] [1] J. Armstrong, J. Lightwave Technol. 27, 189 (2009).

[2] [2] W. Shieh, H. Bao, and Y. Tang, Opt. Express 16, 841(2006).

[3] [3] D. Qian, J. Yu, J. Hu, L. Zong, L. Xu, and T. Wang, in Proceedings of OFC 2008 OMM3 (2008).

[4] [4] Y. Li, W. Li, K. Yang, Y. Qiao, J. Mei, and H. Zhang, Chin. Opt. Lett. 8, 275 (2010).

[5] [5] L. Cheng, H. Wen, X. Zheng, H. Zhang, and Y. Guo, Chin. Opt. Lett. 8, 377 (2010).

[6] [6] J. Yu, M.-F. Huang, D. Qian, L. Chen, and G.-K. Chang, IEEE Photon. Technol. Lett. 20, 1545 (2008).

[7] [7] Z. Jia, J. Yu, D. Qian, G. Ellinas, and G. Chang, in National Fiber Optic Engineers Conference, OSA Technical Digest (CD) JWA108 (2008).

[8] [8] X. Liang, W. Li, W. Ma, and K. Wang, Opt. Express 17, 15614 (2009).

[9] [9] S. Hellerbrand, B. Goebel, and N. Hanik, in Proceedings of OFC 2009 JThA48 (2009).

[10] [10] B. S. Krongold, Y. Tang, and W. Shieh, in Proceedings of ECOC 2008 157 (2008).

[11] [11] A. J. Lowery, Opt. Express 15, 12965 (2007).

[12] [12] M. Nazarathy, J. Khurgin, R. Weidenfeld, Y. Meiman, P. Cho, R. Noe, I. Shpantzer, and V. Karagodsky, Opt. Express 16, 15777 (2008).

[13] [13] A. J. Lowery, IEEE Photon. Technol. Lett. 19, 1556(2007).

[14] [14] X. Li and L. J. Cimini, Jr., IEEE Commun. Lett. 2, 131(1998).

[15] [15] S. H. M¨uller and J. B. Huber, Electron. Lett. 33, 368(1997).

[16] [16] A. E. Jones, T. A. Wilkinson, and S. K. Barton, Electron. Lett. 30, 2098 (1994).

[17] [17] R. W. B¨auml, R. F. H. Fisher, and J. B. Huber, Electron. Lett. 32, 2056 (1996).

[18] [18] S. Kumar and D. Yang, Opt. Lett. 33, 2002 (2008).

[19] [19] K. Lee, T. T. Chan, and J. K. Rhee, Opt. Express 16, 4023 (2008).

[20] [20] K. Takiguchi, M. Oguma, T. Shibata, and H. Takahashi, in Proceedings of OFC 2009 OWO3 (2009).

[21] [21] W. Li, X. Liang, W. Ma, T. Zhou, B. Huang, and D. Liu, Opt. Fiber Technol. 16, 5 (2010).

[22] [22] S. H. Han and J. H. Lee, IEEE Wireless Commun. 12,(2) 56 (2005).

[23] [23] D. Yang and S. Kumar, Opt. Express 17, 17214 (2009).