Research On Multi-wavelength Fiber Lasers With Novel Resonant Cavity

Multi-wavelength Brillouin erbium-doped fiber lasers(MBEFL)based on stimulated Brillouin scattering have been widely used in all-optical communication networks and dense wavelength division multiplexing systems because of their high conversion efficiency,narrow linewidth,low threshold,fixed wavelength interval and high extinction ratio.The self-excited MBEFL suppress the mode competition in the resonant cavity by inserting fiber filter.But the filter is very sensitive to the external environment which makes it a wide range of applications in the field of laser sensing.The stimulated MBEFL suppress the self-lasing cavity mode by inserting the external enhanced Brillouin pump and its working wavelength is determined by the position of the self-lasing cavity mode and the working wavelength of the Brillouin pump,so it has been widely applicated in all-optical communication network and dense wavelength division multiplexing system.In this paper,MBEFL is studied from two aspects: self-excited and stimulated.The main work is as follows:1.Based on the M-Z interferometer made by ourselves,the self-excited MBEFL with ring cavity structure is fabricated.The experimental results show that 18 laser outputs with extinction ratio of more than 20 d B can be achieved.2.A novel self-excited multi-wavelength laser with 25 stable multi wavelength laser outputs is proposed and the extinction ratio of each wavelength is more than 20 d B.3.Based on the preamplifier technology,a multi wavelength laser with a single cavity structure is proposed.33 stable multi-wavelength outputs with a tuning range of 12 nm are obtained.4.A dual linear cavity multiwavelength laser with a threshold of 35 m W is proposed and up to 51 stable multi-wavelength outputs are obtained.