Fig. 1. Schematic diagram of the fiber laser structure. (a) The common ring fiber laser structure uses FBG filters to achieve single mode operation. (b) The ring fiber laser filtered with WGMR.

Fig. 2. Power output of a WGM filtered fiber laser at different pump powers and laser spectrum. (a) Experiment and simulation results using the traditional ring fiber laser power analysis model. (b) Output fluorescence spectrum of the Er-doped fiber end point A (as shown in Fig. 1) in the FBG and WGMR system.

Fig. 3. (a) The output power test results of a laser with a loss of 0–40 dB at different pump powers (200 mW, 250 mW, and 300 mW). The inset in the figure shows the amplification of the 20–40 dB range. (b) The output power experiment and simulation results of a laser with a pump power of 300 mW at a loss of 0–40 dB.

Fig. 4. (a) Comparison between the simulation results and test results of the laser power output at a pump power of 200 mW. (b) Comparison between the simulation results and test results of the laser power output at a pump power of 250 mW.

Fig. 5. Comparison between the simulation results and test results of the laser power output with different L at a pump power of 150 mW, 200 mW, and 250 mW.