[1] D. Vez, S. Eitel, S. G. Hunziker, G. Knight, M. Moser, R. Hoevel, H.-P. Gauggel, M. Brunner, A. Hold, and K. H. Gulden, Proc. SPIE 4942, 29 (2003).

[2] T. L. Koch and J. E. Bowers, Electron. Lett. 20, 1038 (1984).

[3] X. Zhao, D. Parekh, E. K. Lau, H.-K. Sung, M. C. Wu, W. Hofmann, M. C. Amann, and C. J. Chang-Hasnain, Opt. Express 15, 14810 (2007).

[4] E. K. Lau, X. Zhao, H.-K. Sung, D. Parekh, C. J. Chang-Hasnain, and M. C. Wu, Opt. Express 16, 6609 (2008).

[5] A. Ng'oma, D. Fortusini, D. Parekh, W. Yang, M. Sauer, S. Benjamin, W. Hofmann, M. C. Amann, and C. J. Chang-Hasnain, J. Lightwave Technol. 28, 2436 (2010).

[6] C. Hong, C. Zhang, J. Duan, W. Hu, A. Xu, and Z. Chen, Chin. Opt. Lett. 8, 1040 (2010).

[7] X. Zhao, B. Zhang, L. Christen, D. Parekh, W. Hofmann, M. C. Amann, F. Koyama, A. E. Willner, and C. J. Chang-Hasnain, Opt. Express 17, 13785 (2009).

[8] D. Parekh, B. Zhang, X. Zhao, Y. Yue, W. Hofmann, M. C. Amann, A. Willner, and C. J. Chang-Hasnain, Opt. Express 18, 20552 (2010).

[9] C. Zhang, J. Li, F. Zhang, Y. He, H. Wu, and Z. Chen, Opt. Express 18, 24556 (2010).

[10] W. Yang, P. Guo, D. Parekh, and C. J. Chang-Hasnain, Opt. Express 18, 20887 (2010).