[1] A. E. Willner, B. Zhang, L. Zhang, L. S. Yan, and I. Fazal, IEEE J. Selected Topics Quantum Electron. 14, 691 (2008).
[2] Y. Okawachi, M. S. Bigelow, J. E. Sharping, Z. Zhu, A. Schweinsberg, D. J. Gauthier, R. W. Boyd, and A. L. Gaeta, Phys. Rev. Lett. 94, 153902 (2005).
[3] G. Lenz, B. J. Eggleton, C. K. Madsen, and R. E. Slusher, IEEE J. Quantum Electron. 37, 525 (2001).
[4] C. J. Chang-Hasnain and S. L. Chuang, J. Lightwave Technol. 24, 4642 (2006).
[5] C. J. Chang-Hasnain, P. C. Ku, I. Kim, and S. L. Chuang, Proc. IEEE 91, 1884 (2003).
[6] C. F. Wang, J. Cheng, and S. S. Han, Chin. Opt. Lett. 8, 115 (2010).
[7] C. Li, H. Tian, H. Lu, and Y. Ji, Acta Opt. Sin. (in Chinese) 30, 2108 (2010).
[8] J. Zhao, X. Yang, Y. Li, Z. Tong, Y. Liu, and Q. Zhao, Acta Opt. Sin. (in Chinese) 30, 2437 (2010).
[9] X. Zhao, P. Palinginis, B. Pesala, and C. J. C. hang-Hasnain, Opt. Express 13, 7899 (2005).
[10] P. C. Peng, F. M. Wu, C. T. Lin, J. H. Chen, P. T. Shih, W. C. Kao, W. J. Jiang, H. C. Kuo, and S. Chi, in Proceedings of Lasers and Electro-Optics, 2008 and 2008 Conference on Quantum Electronics and Laser Science JThA2 (2008).
[11] P. C. Peng, C. T. Lin, H. C. Kuo, J. N. Liu, W. K. Tsai, G. Lin, H. P. Yang, K. F. Lin, J. Y. Chi, S. C. Chi, and S. C. Wang, in Proceedings of Optical Fiber Communication and the National Fiber Optic Engineers Conference OThT6 (2007).
[12] C. S. Chou, R. K. Lee, P. C. Peng, H. C. Kuo, G. Lin, H. P. Yang, and J. Y. Chi, in Proceedings of IEEE Optical MEMS and Nanophotonics 15 (2007).
[13] J. Piprek, E. S. Bj¨orlin, and J. E. Bowers, Electron. Lett. 37, 298 (2001).
[14] Z. Shi, R. W. Boyd, R. Pant, M. D. Stenner, M. A. Neifeld, Z. Zhu, and D. J. Gauthier, Opt. Lett. 32, 1 (2007).
[15] G. D. Cole, E. S. Bj¨orlin, Q. Chen, C.-Y. Chan, S. Wu, S. Wang, N. C. MacDonald, and J. E. Bowers, IEEE J. Quantum Electron. 41, 390 (2005).