The Optimization Design Of Multi-wavelength Fiber Laser Based On The SOA

There are many applications of multi-wavelength fiber laser in the field of telecommunication, measurement, etc. with the advantageous of simple structure, low cost, etc. Multi-wavelength fiber laser is one of the key technologies in the Dense Wavelength Division Multiplexing (DWDM) transmission system. In this thesis, the power equalization of multi-wavelength fiber laser based on the semiconductor optical amplifier (SOA) is demonstrated, ring cavity mode locked fiber laser based on grapheme was primarily researched. The main content is shown as below.(1) We proposed a multi-wavelength ring cavity laser structure, with four cascaded fiber Bragg gratings (FBG) as frequency select component, the central wavelength of the four FBGs are1447nm,1449nm,1551nm and1553nm, separately. The output of this structure is severely affected by the mode competition of Erbium doped fiber.(2) The operation of SOA is studied, the static characteristic of SOA is investigated. Then we proposed a fiber laser setup incorporating SOA as a second amplifier in the ring cavity. The performance of the output is significantly improved, with power fluctuation among different wavelength is reduced from14.7dB to4.1dB. We also introduced a F-P cavity to achieve a better performance of the output, with the interference function of the F-P cavity provided, the power fluctuation is reduced to1.8dB. the laser’s parameters is also optimized, with pump power as900mW, EDF length15m and SOA drive current as252mA, the laser will achieve its best performance.(3) As a new material, the saturated absorption characteristics of graphene in terms of mode-locked lasers draws a widely attention. We proposed a graphene based saturable absorber mode-locked ring laser cavity structure, obtain a pulse with period of127ns, the average pulse laser output power is1.31mW...