[1] F. Ramos, E. Kehayas, J. M. Martinez, R. Clavero, J. Marti, L. Stampoulidis, D. Tsiokos, H. Avramopoulos, J. Zhang, P. V. Holm-Nielsen, N. Chi, P. Jeppesen, N. Yan, I. T. Monroy, A. M. J. Koonen, M. T. Hill, Y. Liu, H. J. S. Dorren, R. V. Caenegem, D. Colle, M. Pickavet, and B. Riposati, J. Lightwave Technol. 23, 2993 (2005).

[2] Z. Pan, H. Yang, J. Yang, J. Hu, Z. Zhu, J. Cao, K. Okamoto, S. Yamano, V. Akella, and S. J. B. Yoo, J. Lightwave Technol. 23, 3270 (2005).

[3] W. A. Vanderbauwhede and D. A. Harle, J. Lightwave Technol. 23, 2215 (2005).

[4] B. A. Small, T. Kato, and K. Bergman, IEEE Photon. Technol. Lett. 17, 2472 (2005).

[5] A. M. J. Koonen, J. J. V. Olmos, I. T. Monroy, J. G. J. Jennen, C. Peucheret, E. van Breusegem, and E. Zouganeli, in Proceedings of ECOC2005 Mo4.4.1 (2005).

[6] H. Uenohara, S. Shimizu, and K. Kobayashi, in Proceedings of ECOC2005 Th3.4.1 (2005).

[7] D. Chiaroni, N. L. Sauze, T. Zami, and J. Y. Emery, in Proceedings of ECOC2001 We.B.2.6 (2001).

[8] H. Wessing, B. Sorensen, B. Lavigne, E. Balmefrezol, and O. Leclere, in Proceedings of OFC2004 WD2 (2004).

[9] A. V. Tran, C.-J. Chae, and R. S. Tucker, in Proceedings of OFC2005 OME46 (2005).

[10] J. L. Jackel, T. C. Banwell, S. R. McNown, and J. A. Perreault, in Proceedings of ECOC2001 We.B.3.6 (2001).

[11] Y. Ling, K. Qiu, P. Liu, and Y. Wang, in Proceedings of ICOCN2005 237 (2005).

[12] P. Brosson, J. Lightwave Technol. 12, 49 (1994).

[13] M. J. Connelly, IEEE J. Quantum Electron. 37, 439 (2001).

[14] M. J. Connelly, IEE Proc. Circuits Devices Syst. 149, 173 (2002).