A short wavelength band erbium-doped fiber (EDF) ring laser emitting simultaneously at 1488.9 and 1533.9 nm is demonstrated. The erbium-doped gain fiber has a depressed cladding to suppress emission at longer wavelengths. The shorter emitting wavelength is selected by a fiber Bragg grating (FBG), while the longer emitting wavelength is selected by the strong gain and the reabsorbing effect. Switching between the two operating wavelengths is realized by simply changing the bending curvature of the EDF loop. Experimental setup of the switchable dual-wavelength erbiumdoped fiber ring laser

Abstract:The C-band is demonstrated to be suitable for pumping L-band erbium-doped fiber laser (EDFL) with a broad pumping band. A high power C-band superfluorescent fiber source (SFS) peaked at 1545 nm with output power of 1.86 W is constructed and utilized as pump source for L-band EDFL. Based on this, an all single-mode-fiber L-band EDFL emitting at 1591.9 nm with 1.19 W output power is obtained. The laser exhibits a high conversion efficiency of 64.0% with a high ASE extinction ratio of 66 dB and a narrow bandwidth of less than 0.08 nm.