[1] [1] G. R. Aiello and G. D. Rogerson, IEEE Microw. Mag. 4, (2) 36 (2003).

[2] [2] Q. Wang, F. Zeng, S. Blais, and J. Yao, Opt. Lett. 31, 3083 (2006).

[3] [3] J. Dong, X. Zhang, J. Xu, and D. Huang, Opt. Lett. 32, 1223 (2007).

[4] [4] J. Dong, X. Zhang, J. Xu, and D. Huang, Opt. Lett. 32, 2158 (2007).

[5] [5] H. Chen, M. Chen, T.Wang, M. Li, and S. Xie, J. Lightwave Technol. 26, 2492 (2008).

[6] [6] W. Zhang, J. Sun, J. Wang, C. Cheng, and X. Zhang, IEEE Photon. Technol. Lett. 21, 271 (2009).

[7] [7] E. Zhou, X. Zhang, X. Yu, J. Dong, W. Xue, and I. T. Monroy, in Proceedings of OFC 2009 JWA49 (2009).

[8] [8] T. H. Wu, J. P. Wu, Y. F. Choi, and Y. J. Chiu, in Proceedings of LEOS 2009 WO3 (2009).

[9] [9] H. Wang, J. Wu, and J. Lin, J. Lightwave Technol. 23, 2761 (2005).

[10] [10] P. Li, D. Huang, X. Zhang, and G. Zhu, Opt. Express 14, 11839 (2006).

[11] [11] A. V. Uskov, J. R. Karin, J. E. Bowers, J. G. McInerney, and J. L. Bihan, IEEE J. Quantum Electron. 34, 2162(1998).

[12] [12] E. J. M. Verdurmen, Y. Liu, G. D. Khoe, and H. de Waardt, IEE Proc.-Optoelectron. 153, 75 (2006).