[1] S. J. B. Yoo, J. Lightwave Technol. 24, 4468 (2006).
[2] R. Elschner, C.-A. Bunge, B. Hüttl, A. Gual i Coca, C. Schmidt-Langhorst, R. Ludwig, C. Schubert, and K. Petermann, IEEE J. Sel. Top. Quantum Electron. 14, 666 (2008).
[3] X. Zhang, X. Ren, Z. Wang, Y. Xu, Y. Huang, and X. Chen, Chin. Opt. Lett. 5, 386 (2007).
[4] Q. Wang, B. Yang, L. Zhang, H. Zhang, and L. He, Chin. Opt. Lett. 5, 538 (2007).
[5] F. S. Yang, M. E. Marhic, and L. G. Kazovsky, Electron. Lett. 32, 2336 (1996).
[6] J. Hansryd and P. A. Andrekson, IEEE Photon. Technol. Lett. 13, 194 (2001).
[7] P. J. Winzer and R.-J. Essiambre, J. Lightwave Technol. 24, 4711 (2006).
[8] J. Dong, X. Zhang, and D. Huang, Acta Opt. Sin. (in Chinese) 28, 1327 (2008).
[9] P. Devgan, R. Tang, V. S. Grigoryan, and P. Kumar, J. Lightwave Technol. 24, 3677 (2006).
[10] L. K. Wickham, R.-J. Essiambre, A. H. Gnauck, P. J. Winzer, and A. R. Chraplyvy, IEEE Photon. Technol. Lett. 16, 1591 (2004).
[11] A. Richter, I. Koltchanov, K. Kuzmin, E. Myslivets, and R. Freund, in Proceedings of OFC2005 NTuH3 (2005).
[12] R. H. Stolen, Proc. IEEE 68, 1232 (1980).
[13] J. M. C. Boggio, J. D. Marconi, and H. L. Fragnito, J. Lightwave Technol. 23, 3808 (2005).
[14] M. Lorenzen, D. Noordegraaf, C. V. Nielsen, O. Odgaard, L. Grüner-Nielsen, and K. Rottwitt, in Proceedings of OFC2008 OML1 (2008).
[15] K. K. Y. Wong, M. E. Marhic, K. Uesaka, and L. G. Kazovsky, IEEE Photon. Technol. Lett. 14, 911 (2002).