Effect of Doped Fiber Length on the Stretch Pulses
of a Mode-Locked Erbium-Doped Fiber Laser¹

S. J. Tan^a, M. A. Ismail^a, N. S. Shahabuddin^a, H. Ahmad^b, H. Arof^a, and S. W. Harun^{a, b,} *

^a Department of Electrical Engineering, Faculty of Engineering, University of Malaya 50603 Kuala Lumpur, Malaysia

^b Photonics Research Center, University of Malaya, 50603 Kuala Lumpur, Malaysia

*e-mail: swharun@um.edu.my

Received January 27, 2012; in final form, February 9, 2012; published online June 12, 2012

Abstract—A passively self-starting mode-locked fiber ring laser is demonstrated using a highly concentrated
Erbium doped fiber (EDF) with a saturable absorber. The effect of EDF length on the performance of the laser
is investigated. Stable stretched pulses are obtained at wavelength region of 1560nm with a repetition rate rang-
ing from 10.1 to 12.1 MHz and a pulse width stretching from 0.52 to 0.75 ps as the EDF length is reduced from
4.5 to 1.5 m. The repetition rate goes higher as the cavity length decreases when a shorter EDF is used but the
pulse width reduces as the EDF length increases since the total group velocity dispersion (GVD) in the cavity
is close to zero.

DOI: 10.1134/S1054660X12070134

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