Abstract

Simultaneous and independent active Q switching and active mode locking of an erbium-doped fiber laser is demonstrated using all-fiber modulation techniques. A magnetostrictive rod attached to the output fiber Bragg grating modulates the Q factor of the Fabry–Perot cavity, whereas active mode locking is achieved by amplitude modulation with a Bragg-grating-based acousto-optic device. Fully modulated Q-switched mode-locked trains of optical pulses were obtained for a wide range of pump powers and repetition rates. For a Q-switched repetition rate of 500Hz and a pump power of 100mW, the laser generates trains of 12–14 mode-locked pulses of about 1ns each, within an envelope of 550ns, an overall energy of 0.65μJ, and a peak power higher than 250W for the central pulses of the train.

© 2009 Optical Society of America

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