We demonstrate a simple and low cost mode-locked erbium-doped fiber laser (EDFL) operating in the nanosecond region using a single-walled carbon nanotube (SWCNT)-based saturable absorber (SA). A droplet of SWCNT solution is applied on the end of a fiber ferrule, which is then mated to another clean connector ferrule to construct an SA. Then the SA is integrated into a ring EDFL cavity for nanosecond pulse generation. The EDFL operates at around 1570.4 nm, with a soliton-like spectrum with small Kelly sidebands, which confirms the attainment of the anomalous dispersion. It produces a soliton pulse train with a 332 ns width, repetition rate of 909.1 kHz, an average output power of 0.31 mW, and energy of 0.34 nJ at the maximum pump power of 130.8 mW.
© 2012 Optical Society of America
Lasers and Laser Optics
Original Manuscript: October 23, 2012
Revised Manuscript: November 22, 2012
Manuscript Accepted: November 25, 2012
Published: December 14, 2012
Mohd Afiq Ismail, Sulaiman Wadi Harun, Nurul Rozullyah Zulkepely, Roslan Md Nor, Fauzan Ahmad, and Harith Ahmad, "Nanosecond soliton pulse generation by mode-locked erbium-doped fiber laser using single-walled carbon-nanotube-based saturable absorber," Appl. Opt. 51, 8621-8624 (2012)