Abstract

Active mode locking of an erbium-doped all-fiber laser with a Bragg-grating-based acousto-optic modulator is demonstrated. The fiber Bragg grating was acoustically modulated by a standing longitudinal elastic wave, which periodically modulates the sidebands at twice the acoustic frequency. The laser has a Fabry–Perot configuration in which cavity loss modulation is achieved by tuning the output fiber Bragg grating to one of the acoustically induced sidebands. Optical pulses at 9MHz repetition rate, 120mW peak power, and 780ps temporal width were obtained. The output results to be stable and has a timing jitter below 40ps. The measured linewidth, 2.8pm, demonstrates that these pulses are transform limited.

© 2009 Optical Society of America

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