Experimental Study on Brillouin Erbium Fiber Laser: Configuration and Characteristics

We carry out the experimental study on Brillouin erbium fiber laser in two different structure configurations. In the first configuration, Brillouin pump laser directly stimulates the Brillouin scattering light, whilst in the second it gets pre-amplification before stimulating the Brillouin scattering light in silica optical fiber. Employing distributed-feedback fiber laser as the Brillouin pump laser, we get the Brillouin erbium fiber lasers having subhundred Hertz linewidth. The first configuration has a higher pump threshold and a higher maximum output power, which is over 20 mW for a 250 mW 980 nm pump. The second configuration with pre-amplification for Brillouin pump laser has a lower pump threshold and a smaller maximum output power.