[1] Park S, Leavitt R et al 2005 IEEE Photon. Technol. Lett.
17 980

[2] Zhu T, Rao Y J and Mo Q J 2006 Acta Phys. Sin.
55 249 (in Chinese)

[3] Jin L et al 2007 Chin. Phys. Lett. 24 1603

[4] Feng S C, Xu O, Lu S H and Jian S S 2009 Chin. Phys.
Lett. 26 064208

[5] Li J et al 2009 Chin. Phys. Lett. 26 074209

[6] Bishnu P P 2006 Guided Wave Optical Components and
Devices (New York: Elsevier)

[7] Tran A V, Chae C J and Tucker R S 2003 Appl. Opt.
42 3495

[8] Pruessner M W, Sttevater T H and Rabinovich W S 2007
Opt. Lett. 32 1253

[9] Jiang X S, Chen Y, Vienne G and Tong L M 2007 Opt.
Lett. 32 1710

[10] Song B S et al 2005 J. Lightwave Technol. 23
1449

[11] Chen K, Sheng Q Q and Dong X Y 2004 Chin. Phys.
Lett. 21 332

[12] Dong L, Hua P and Birks T A 1996 IEEE Photon.
Technol. Lett. 8 1656

[13] Anthony S K, George A R and Phil A W 1998 Opt.
Lett. 23 2

[14] Dong X W, Pei L and Jian S S 2006 Acta Phys. Sin.
55 4739 (in Chinese)

[15] Dong X W, Feng S C, Lu S H, Xu O and Jian S S 2007
Acta Phys. Sin. 56 7039 (in Chinese)

[16] Zhang S H and Tamir T 1996 J. Opt. Soc. Am. A
13 2043

[17] Yesayan A and Vallee R 2001 Opt. Lett. 26
1329

[18] Florence Y, Chan M, Yasumoto K and Shum P 2009 J.
Opt. Soc. Am. A 26 489

[19] Ren G B, Shum P, Hu J J, Yu X and Gong Y D 2007 Opt.
Lett. 32 3059

[20] Lacroix S, Gonthier F and Bures J 1994 Appl. Opt.
33 8361

[21] Ortega B and Dong L1999 J. Lightwave Technol.
17 123

[22] Erdogan T 1997 J. Lightwave Technol. 15 1277

[23] Volanthen M et al 1996 Electron. Lett. 32
1028

[24] Xu M G et al 1993 Electron. Lett. 29 398

[25] Kersey A D et al 1993 Opt. Lett. 18 72