Reseach On Multi-wavelength Fiber Laser Based On Stimulated Brillouin Scattering

In order to improve the speed and capacity of optical fiber communication and adapt to the rapid development of wavelength division multiplexing system, we study the tunable multi-wavelength Brillouin erbium-doped fiber laser by theory and experiment. Multi-wavelength Brillouin erbium-doped fiber lasers have the advantages of ultra-narrow linewidth, stability frequency, simple scheme, low noise intensity and so on.This paper mainly reviews development history of the fiber laser and research status at home and abroad. We explain basic knowledges about the linear amplification mechanism of erbium-doped fiber amplifier and the stimulated Brillouin scattering process. And from the followed several aspects to start works:(1) We successfully establish a theoretical model of a novel tunable multi-wavelength Brillouin erbium-doped fiber laser. We present the mathematical processing method of each unit module of the system modeling. After that, we mainly use control variable method to analyze the influence factors of Brillouin multiwavelength spectral line output and tuning characteristics by matlab.(2) The mechanisms of realizing the tunable wavelength and the switchable frequency spacing by the gain and loss of the stimulated Brillouin scattering are verified. By the experimental result of the spectrum with triple Brillouin frequency spacing, the hypothesis of switchable frequency spacing at an interval of about N×10 GHz(N=1, 2, 3, …) at the expense of the optical fibers and pump power is confirmed indirectly.(3) The multi-wavelength Brillouin erbium-doped fiber laser can be continuously tuned over 22 nm from 1547 to 1569 nm by adjusting the BP wavelength.The theoretical simulation coincides well with the experimental results. It verifies the correctness of theoretical models.