Experimental Study of Parabolic Bound Pulses
from an Er-Doped Fiber Ring Laser¹

S. M. Zhang*, Y. P. Hao, C. J. Jin, Y. C. Meng, H. F. Li, J. Du, and X. L. Li

College of Physics Science and Information Engineering, Hebei Advanced Thin Films Laboratory, Hebei Normal University,
Shijiazhuang, 050024 China

*e-mail: zhangsm_sd@126.com

Received January 15, 2012; published online May 11, 2012

Abstract—We have experimentally observed various bound states of parabolic pulses in a passively mode-
locked Erbium-doped fiber ring laser. Beyond the mode-locking threshold, stable single parabolic pulse with
the duration of 3.29 ps has been obtained and compressed outside the cavity to 253 fs assuming a sech² profile.
By increasing the pump power and rotating the polarization controllers, stable bound states of two parabolic
pulses with a fixed separation of 6.5 ps has been obtained. Further increasing the pump power and carefully
adjusting the intracavity PCs, multiple bound pulses have also been observed in the same cavity with the same
pulse separation.

10.1134/S1054660X12060199

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