We present an experimental study of pulse dynamics in a mode-locked Er:fiber laser. By injecting a continuous wave laser with sinusoidal intensity modulation into the fiber laser, we are able to modulate the gain. Measuring the response of the pulse energy, central frequency, central pulse time, and phase to the gain modulation allows determination of the parameters that describe their coupling. Based on the experimentally derived parameters, we evaluate the free running comb linewidth and frequency uncertainty with feedback included, assuming quantum noise is the limiting factor. Optimization of fiber lasers is also discussed.
© 2014 Optical Society of America
Lasers and Laser Optics
Original Manuscript: March 10, 2014
Manuscript Accepted: April 10, 2014
Published: May 27, 2014
Chengying Bao, Andrew C. Funk, Changxi Yang, and Steven T. Cundiff, "Pulse dynamics in a mode-locked fiber laser and its quantum limited comb frequency uncertainty," Opt. Lett. 39, 3266-3269 (2014)