[1] [1] J.-X. Cai, M. Nissov, W. Anderson, M. Vaa, C. R. Davidson, D. G. Foursa, L. Liu, Y. Cai, A. J. Lucero, W. W. Patterson, P. C. Corbett, A. N. Pilipetskii, and N. S. Bergano, in Proceedings of OFC 2006 OFD3 (2006).

[2] [2] A. J. Lucero, D. G. Foursa, D. Kovsh, M. Nissov, and A. N. Pilipetskii, in Proceedings of OFC 2007 JThA39 (2007).

[3] [3] A. Lucero, D. G. Foursa, C. R. Davidson, M. Nissov, D. Kovsh, and A. N. Pilipetskii, in Proceedings of OFC 2008 OTuE3 (2008).

[4] [4] H. Maeda, G. Funatsu, and A. Naka, Electron. Lett. 41, 34 (2005).

[5] [5] J. He, L. Chen, and S. Wen, Chin. Opt. Lett. 7, 15 (2009).

[6] [6] J. Armstrong and A. J. Lowery, Electron. Lett. 42, 370 (2006).

[7] [7] A. J. Lowery, L. B. Du, and J. Armstrong, J. Lightwave Technol. 25, 131 (2007).

[8] [8] J. Gao, X. Xu, Q. Chang, and Y. Su, Chin. Opt. Lett. 7, 109 (2009).