[1] J. Capmany, B. Ortega and D. Pastor, J. Lightwave Technol. 24, 201 (2006).
[2] R. A. Minasian, IEEE Trans. Microw. Theory Tech. 54, 832 (2006).
[3] J. P. Yao, J. Lightwave Technol. 27, 314 (2009).
[4] CHI Hao, ZHANG Xian-min and SHEN Lin-fang, Journal of Optoelectronics·Laser 17, 17 (2006). (in Chinese)
[5] S. Sales, J. Capmany, J. Marti and D. Pastor, Electron. Lett. 31, 1095 (1995).
[6] S. P. Li, K. S. Chiang, W. A. Gambling, Y. Liu, L. Zhang and I. Bennion, IEEE Photon. Technol. Lett. 12, 1207 (2000).
[7] Sze-Chun Chan, Qing Liu, Zhu Wang and Kin Seng Chiang, Opt Express 19, 12045 (2011).
[8] ZHANG Ai-ling and WU Xiao-jun, Optoelectronics Letters 9, 108 (2013).
[9] J. Mora, M. V. Andres, J. L. Cruz, B. Ortega, J. Capmany, D. Pastor and S. Sales, Opt. Lett. 28, 1308 (2003).
[10] Fei Zeng, Jun Wang and Jianping Yao, Opt. Lett. 30, 2203 (2005).
[11] J. Wang, F. Zeng and J. P. Yao, IEEE Photon. Technol. Lett. 17, 2176 (2005).
[12] J. Capmany, D. Pastor, A. Martinez, B. Ortega and S. Sales, Opt. Lett. 28, 1415 (2003).
[13] B. Vidal, J. L. Corral and J. Marti, IEEE Photon. Technol. Lett. 17, 666 (2005).
[14] B. Vidal, J. L. Corral and J. Marti, Opt. Express 14, 581 (2006).
[15] N. Dagli, IEEE Trans. Microwave Theory Tech. 47, 1151 (1999).
[16] D. E. Zelmon, D. L. Small and D. Jundt, J. Opt. Soc. Am. B 14, 3319 (1997).
[17] C. H. Sarantos and N. Dagli, Opt. Express 18, 14598 (2010).