[1] YANG L Zh,CHEN G F,WANG Y Sh et al.Study of Yb3+-doped fiber ring laser of ultrashort pulse[J].Acta Photonica Si nica,2004,33(4):389～392(in Chinese).
[2] SUN J Q,HUANG D X.Control of self-pulsation in Er3+-doped fiber laser[J].Acta Optica Sinica,1996,16 (9):1237～1240 (in Chinese).
[3] MATSAS V J,NEWSON T P,RICHARDSON D J et al.Self-starting passively mode-locked fibre ring soliton laser exploiting nonlinear polarization rotation[J].Electron Lett,1992,28 (15):1391～1393.
[4] LIU D F,CHEN G F,WANG X H et al.Structure stable Er3+-doped fiber ring laser[J].Laser Technology,1999,23 (4):231～233 (in Chinese).
[5] WANG Zh Y,WANG Y Q,LI Sh Ch et al.Self-starting passively mode-locked Er3+-doped fiber lasers[J].Journal of Optoelectronics · Laser,2004,15 (3):295～298 (in Chinese).
[6] SALHI M,LEBLOND H,SANCHEZ E et al.Theoretical study of the erbium-doped fiber laser passively mode-locked by nonlinear polarization rotation[J].Phys Rev,2003,A67 (1):013802/1～013802/7.
[7] LIU D F,CHEN G F,WANG X H et al.Experiment research of selfstarting passively mode-locked Er3+-doped fiber ring soliton lasers[J].Science in China,1999,29 (7):656～661 (in Chinese).
[8] RUEHL A,HUNDERTMARK H,WANDT D et al.0.7W all-fiber erbium oscillator generating 64fs wave breaking-free pulses[J].Optics Express,2005,13 (16):6305～6309.
[9] HUNDERTMARK H,KRACHT D,ENGELBRECHT M et al.Stable sub-85fs passively mode-locked erbium fiber oscillator with tunable repetition rate[J].Optics Express,2004,12(14):3178～3183.
[10] DAVEY R P,LANGFORD N,FERGUSON A L et al.Role of polarization rotation in the modelocking of an Er fibre laser[J].Electron Lett,1993,29 (9):758～760.
[11] NELSON L E,JONES D J,HAUS H A et al.Ultrashort-pulse fiber ring lasers[J].Appl Phys,1997,B65 (2):277～294