A switchable dual-wavelength erbium-doped fiber laser based on saturable absorber and active optical fiber ring filter

Abstract

A dual-wavelength erbium-doped fiber laser (EDFL) with outstanding stability is presented. In the fiber laser system, two nested active optical fiber ring filters are configured to improve the comb spectrum performance, a saturable absorber is employed to form a gain grating for both filtering and frequency stabilizing, two cascaded fiber Bragg gratings (FBGs) are utilized to achieve dual-wavelength output, and a variable attenuator is arranged to adjust output power. Experimental results illustrate that the peak wavelength drift is less than 3 pm, and a good linear relationship between output power and pump power is realized.

Evaluation of an Erbium-Doped Fiber Ring Laser, as an Edge Filtering Device for FBG Sensor Interrogation

“…Nevertheless, this family of long cavity EDF ring lasers exhibits strongly multi-longitudinal mode spectrum and suffers from the mode-jumping (or mode-hopping) phenomenon which causes wavelength and optical power instability [24,25]. In our case mode-hopping limits the resolution of the FBG interrogation and needs to be addressed.…”