Observation of Soliton Bound States in a Graphene Mode
Locked Erbium-Doped Fiber Laser¹

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

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 November 10, 2011; in final form, November 14, 2011; published online March 6, 2012

Abstract—We report on the experimental observation of bound states of solitons in a graphene mode locked
erbium-doped fiber laser. By using graphene as a saturable absorber, we have obtained stable, single and bound
soliton pulses, the latter with a full width at half maximum (FWHM) of 1.49 ps and a fixed pulse separation of
2.46 ps. Our results once again show that bound soliton pulses is an intrinsic feature of fiber lasers independent
of the exact mode locking mechanism.

DOI: 10.1134/S1054660X12040081

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