A compact linear-cavity multi-wavelength Brillouin/thulium fiber laser in S/S+-band

Abstract

• A compact Brillouin laser linear cavity system. • Multi-wavelength output over a 55 nm tuning range from 1460 to 1515 nm. • 28 Brillouin Stokes lines generated at maximum pump power of 250 mW. • Also covers the S + -band region with 5 Stokes lines. A compact Brillouin thulium-doped fluoride fiber (TDFF) multi-wavelength fiber lasers (MWFLs) operating in the S/S + band region is proposed and demonstrated. The system is based on a linear design and utilizes two Faraday mirrors at both ends of the cavity to enable bi-directional oscillation. An 11.5 m long TDFF with an absorption rate of 0.15 dB/m at 1400 nm is used as the gain medium. A stable output laser comb with 28 Stokes lines is obtained at the maximum pump power of 250 mW at the wavelength of 1488 nm. The multi-wavelength Brillouin fiber laser can also be tuned, covering a total tuning range of 55 nm from 1460 nm to 1515 nm. The proposed system is highly stable, and would have significant practical applications.