[1] Hamie A, Sharaiha A, Guegan M and Le B J 2005 IEEE
Photon. Technol. Lett. 17 1229

[2] Xu F, Zhang X L, Liu H R, Liu D M and Huang D X 2006
Chin Phys. Lett. 23 355

[3] Chen G X, Li W, Huang W P and Jian S S 2005 Chin.
Phys. Lett. 22 110

[4] Nakamura S and Tajima K 1997 Appl. Phys. Lett.
70 3498

[5] Nielsen M L, Lavigne B and Dagens B 2003 Electron.
Lett. 39 1334

[6] Liu Y, Tangdiongga E, Li Z, deWaardt H and Koonen A M J
2006 OFC Anaheim PDP28

[7] Tangdiongga E, Liu Y, deWaardt H, Khoe G D and Dorren H J
S 2006 IEEE Photon. Technol. Lett. 18 908

[8] Li Z, Liu Y, Zhang S, Ju H, de Waardt H, Khoe G D, Dorren
H J S and Lenstra D 2005 Electron. Lett. 41 1397

[9] Dong J J, Fu S N, Zhang X L, Shum P, Xu J and Huang D X
2007 Opt. Commun. 270 238

[10] Chen Z X, Wu J, Xu K and Lin J T 2007 Microwave Opt.
Technol. Lett. 49 547

[11] Fu S N, Dong J J, Shum P, Zhang L, Zhang X L and Huang D
X 2006 Opt. Express 14 7587

[12] Dong J J, Zhang X L, Fu S N, Shum P and Huang D X 2007
Chin. Phys. Lett. 24 990