High efficient and narrow linewidth fiber laser based on fiber grating Fabry-Perot cavity

Abstract

A high Er 3+ -doped narrow linewidth fiber laser based on fiber Bragg grating Fabry-Perot cavity was demonstrated. The spatial hole burning effect was restrained by a fiber Faraday rotator. Two short fiber Bragg grating Fabry-Perot cavities as narrow bandwidth filters discriminated and selected laser longitudinal modes efficiently. A stable single-frequency 1534.83 nm laser was acquired. Pumped by two 976 nm laser diodes and twoended output, the fiber laser exhibited a 12 mW threshold. Total 39.5 mW output power and one end 22 mW output power were obtained at the maximum 145 mW pump power. Optical-optical efficiency was 27% and slope efficiency was 29.7%. The output power seemed to be saturated when pump power increased. The 3 dB linewidth of the laser was less than 7.5 kHz, measured by the delayed self-heterodyne method with 15 km monomode fiber. The high power narrow linewidth fiber laser can be used in high resolution fiber sensor systems.

Switchable dual‐wavelength single‐longitudinal‐mode erbium‐doped fiber laser based on a thin‐core fiber comb filter and saturable absorber

“…As mentioned above, stable and SML operation of dual‐wavelength EDFL is typically guaranteed using a SA, MZI , Fabry–Pérot etalon , and feedback fiber loop . Thus, it is valuable to study methods for ensuring SLM operation and constraining shifts in the laser's center wavelength.…”