Wavelength-swept fiber laser with frequency-shifted feedback

In this paper we demonstrate a diode-pumped high-power (>100 mW), wavelength-swept frequency-swept fiber laser (FSFL) in which the output wavelength is continuously and repeatedly tuned over a broad range (up to 38 nm) by modulation of the intracavity acousto-optic tunable filter (AOTF) peak wavelength. Furthermore, we demonstrate for the first time, to our knowledge, that resonant matching of the filter peak sweep rate to the acousto-optic frequency shift per round trip suppresses the nonlinear pulsing observed in conventional frequency-shift lasers, and results in significant narrowing of the instantaneous swept linewidth (<0.1 nm)