Research On The Characteristics Of Multi-wavelength Erbium-doped Fiber Laser And Optical Amplifier

With the opening of 5G services,many countries have begun to conduct research on 6G and7 G services,the support of high-speed and large-capacity dense wavelength division multiplexing(DWDM)systems is indispensable.Among of them,multi-wavelength fiber lasers are the most ideal light source in DWDM systems,and optical amplifiers as the core components of DWDM systems,they must keep up with the DWDM system to meet its basic needs.Therefore,improving the performance of multi-wavelength fiber lasers and optical amplifiers is still the focus research area in DWDM systems.In addition,improving the performance of multi-wavelength fiber lasers and optical amplifiers can also expand their application in medical,military,and aviation fields.How to achieve higher economic benefits,tunable wavelength interval,stable wavelength output under room temperature,etc.are the research hotspots of multi-wavelength fiber lasers,but the research on improving pump power conversion rate,amplifying output gain and gain equalization are still the importance of amplifier area.Therefore,this paper conducts a series of theoretical analysis and experimental exploration on the two important technologies of DWDM system,multi-wavelength fiber laser and optical amplifier.The main research contents are as follows:(1)The basic types and development trends of multi-wavelength fiber lasers and optical amplifiers are introduced separately,which leads to the main research direction of this article is the design analysis of C-band multi-wavelength erbium-doped fiber lasers and the gain flattening of L-band Raman fiber amplifiers the study.(2)Several filters and frequency stabilization devices commonly used in multi-wavelength erbium-doped fiber lasers are introduced,and theoretical models of Lyot filters,MZI interferometers and nonlinear deflection rotation effects are deduced,and simulated and analyzed in combination with Matlab software.(3)A multi-wavelength erbium-doped fiber laser based on the cascade of Lyot and MZI filters is designed,and a stable output of 20 wavelengths with uniform wavelength intervals is obtained at room temperature.In order to improve the flatness of its output light waves,an nonlinear optical loop mirror(NOLM)is inserted into a multi-wavelength erbium-doped fiber laser based on the cascade of Lyot and MZI filters to achieve 9 stable and relatively flat output light waves.(4)The influence of the number of pumps,pump wavelength and pump power on the output gain of the L-band Raman fiber amplifier are respectively explored,and the final average output gain is greater than 10 d B by setting the pump number,wavelength and power reasonably.The noise figure is 8.0d B,and the fluctuation of the output gain spectrum is small.