Theoretical and Experimental Comprehensive Study ofGHz-Range Passively Mode-Locked Fiber Lasers
2020
In this paper, we present a theoretical model based on the nonlinear
Schrodinger equation to characterize GHz-range passively mode-locked fiber
lasers. The modeled cavities of the lasers are configured by a highly
doped and polarization-maintaining single fiber of a single type. For
different pulse repetition rates, ranging from 1.0 to 10.0 GHz, gain
parameters and pump threshold for a stable mode-locked laser emission are
studied. Pulse time width, spectral width, and semiconductor saturable
absorber mirror (SESAM) properties are defined to achieve stable emission.
To experimentally validate our theoretical model, 1.0 and 2.2 GHz laser
cavities have been built up and amplified. A stable and robust operation
for both frequencies was obtained, and the experimental measurements have
been found to match the theoretical predictions. Finally, enhanced
environmental stability has been achieved using a cavity temperature
control system and an antivibration enclosure.
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