[1] H. Takara, S. Kawanishi, M. Saruwatari et al., Generation of highly stable 20 GHz transform-limited optical pulses from actively mode-locked Er3+-doped fiber lasers with an all-polarization maintaining ring activity. Electron. Lett., 1992, 28(22): 2095～2096

[2] M. Nakazawa, E. Yoshida, Y. Kimura, Generation of 98 fs optical pulses directly from an erbium-doped fiber ring laser at 1.57 m. Electron. Lett., 1993, 29(1): 63～64

[3] C. Lin, Y. Silberberg, Fine structure of frequency chirping and FM sideband generation in single-longitudinal-mode semiconductor lasers and 10 GHz direct intensity modulation. Appl. Phys. Lett., 1985, 46(1): 12～14

[6] Yu Jianjun, Yang Bojun, Guan Kejian, The theoretical and experimental research on using normal dispersion fiber to eliminate chirp. Chinese J. Laser(B), 1997, 6(1): 21～28