Wide-spectrum erbium-doped fiber ring laser induced by deexcitation at high pump power

In this paper, a wide-spectrum erbium-doped fiber ring laser (EDFRL) based on the phenomenon of deexcitation is investigated. Experimental results indicate that, at a pump wavelength of 1455 nm, the stimulated Raman scattering effect induces deexcitation within the laser. This leads to a transition from the excited state to the nonexcited state, ultimately resulting in a stable wide-spectrum output. The remaining pump power could be used for optical fiber amplifier to enhance the output power. Combining deexcitation with pump light amplification offers a novel approach for designing high-performance wide-spectrum fiber laser, which shows significant potential for Sagnac-type interferometric optical fiber sensing system. Additionally, the output spectrum aligns with ITU-T standard wavelengths. This characteristic renders the EDFRL highly suitable for a diverse range of practical applications.