Effect of doped fiber length on the stretch pulses of a mode-locked erbium-doped fiber laser

• Main Authors: Tan, S.J., Ismail, M.A., Shahabuddin, N.S., Ahmad, Harith, Arof, Hamzah, Harun, Sulaiman Wadi
• Format: Article
• Language: English
• Published: IOP Publishing 2012
• Subjects: TA Engineering (General). Civil engineering (General)
• Online Access: http://eprints.um.edu.my/10463/1/Effect_of_Doped_Fiber_Length_on_the_Stretch_Pulses.pdf; http://eprints.um.edu.my/10463/

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 ranging 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.