[1] J. Capmany and D. Novak, Nat. Photon. 6, 319 (2007).

[2] J. Yao, J. Lightwave Technol. 3, 314 (2009).

[3] Y. Yu, X. Zheng, H. Zhang, and B. Zhou, Chin. Opt. Lett. 11, 120601 (2013).

[4] D. Zhang, X. Feng, and Y. Huang, Chin. Opt. Lett. 10, 21302 (2012).

[5] B. V. Rodríguez, M. A. Piqueras, and J. Martí, Opt. Lett. 1, 23 (2007).

[6] E. Xu, F. Wang, and P. Li, Optoelectron. Lett. 9, 97 (2013).

[7] J. Capmany, B. Ortega, D. Pastor, and S. Sales, J. Lightwave Technol. 2, 702 (2005).

[8] Y. Yu, E. Xu, J. Dong, L. Zhou, X. Li, and X. Zhang, Opt. Ex-press 24, 25271 (2010).

[9] J. Capmany, J. Mora, B. Ortega, and D. Pastor, Opt. Lett. 17, 2299 (2005).

[10] N. You and R. A. Minasian, Electron. Lett. 24, 2125 (1999).

[11] E. Xu, X. Zhang, L. Zhou, Y. Zhang, Y. Yu, X. Li, and D. Huang, Opt. Lett. 8, 1242 (2010).

[12] X. Xue, X. Zheng, H. Zhang, and B. Zhou, in Proceedings of OFC 2013 OTu2H.2 (2013).

[13] V. R. Supradeepa, C. M. Long, Rui Wu, F. Ferdous, E. Hamidi, D. E. Leaird, and A. M. Weiner, Nat. Photon. 3, 186 (2012).

[14] M. Song, V. Torres-Company, and A. M. Weiner, IEEE Photon. Technol. Lett. 14, 1236 (2012).

[15] G. P. Agrawal, Nonlinear Fiber Optics (Springer, Berlin, 2000).

[16] E. Hamidi, D. E. Leaird, and A. M. Weiner, IEEE Trans. Mi-crow. Theory 11, 3269 (2010).