Optimization of broadband fiber Raman amplifier design
|Keywords||Stimulated Raman Scattering Fiber Raman Amplifier Flat gain bandwidth Simulated annealing algorithm Genetic Algorithms|
With the rapid growth in demand for information capacity and the rapid development of WDM technology , which greatly stimulated the demand for high-performance optical amplifier . Fiber Raman amplifier (FRA) use the transmission fiber itself achieve optical amplification nonlinear effects , because of its excellent characteristics , broadband amplifiers have become the most promising competitor. This paper studies the flat gain bandwidth of optical fiber Raman amplifier optimized. The first chapter briefly describes the characteristics and development of FRA . Then, in the second chapter of the theoretical model for FRA conducted a more comprehensive analysis and discusses key operational features of the FRA . In the third chapter, the fourth-order iterative algorithms when FRA A key operational features of the numerical calculations , analyzes FRA gain characteristics , calculate the noise figure of the amplifier . Solution does not make any assumptions approximation , considering the pump , signal and noise in the transmission process of interaction , thus more realistic . Comparison shows that the calculated results agree well with the published results . Broadband fiber Raman amplifier is designed to optimize key content of this article , the fourth chapter introduces a novel broadband fiber Raman amplifiers optimal design method . By studying the multi-wavelength backward -pumped fiber Raman amplifier propagation equation in two steps to determine the pump wave frequency and the size of the input power . First through the simulated annealing algorithm and genetic algorithm iterations to meet the conditions of the pump wave frequency , and then use the average power analysis methods, using fourth-order iterative method to calculate Adam wave input power of each pump size , in order to design a wide flat gain-bandwidth fiber Raman amplifier . Designed two fiber Raman amplifiers, a dual wavelength pumped , get a flat gain bandwidth of 50nm, gain flatness is less than 1dB. Another four- wavelength pumping , get a flat gain bandwidth of 80nm, gain flatness is less than 1dB. The results demonstrate that the optimization design method for the design of multi-wavelength pumped Raman fiber amplifier flat gain bandwidth is an effective approach.