Fig. 1. Structure of frequency interval switchable multi-wavelength Brillouin-Raman random fiber laser based on cavity loss regulation

Fig. 2. Detailed for the reflective ring 2

Fig. 3. PPD of the BSLs as a function of attenuation of the attenuator

Fig. 4. Two multi-wavelength output spectra of different Brillouin frequency shift intervals at different BP wavelengths

Fig. 5. Two multi-wavelength output spectra of different Brillouin frequency shift intervals at different BP power

Fig. 6. Two multi-wavelength output spectra and their details of different Brillouin frequency shift intervals at optimized pumping condition