Yu Zhong,Wei Wei,Chen Feng,Hou Xun
(School of Electronics and Information Engineering,Xi'an Jiaotong University,Xi'an 710049,China)
Abstract:A numerical analysis method for erbium doped waveguide amplifiers (EDWA),based on the finite difference beam propagation method modified by Douglas scheme,was presented.In the method, the emission and absorption spectrums obtained from experiments were superposed and fitted by Lorentzian algorithm,and combining with multi-level rate equations,the transmission intensity distribution of the optical field in (EDWA) was simulated.Finally,the gain and absorption spectral behavior of EDWA were obtained numerically.Results show that the pump efficiency of EDWA pumped at 980 nm is higher than that at 1480 nm.Meanwhile, by rationally increasing of the pump length and the erbium concentration,larger signal gains can be acquired. Taking account of the up-conversion and cross-relaxation effects of cooperation,the spectrum analysis of highly doped EDWA can be carried out over a wider frequency band.
Keywords:erbium doped waveguide amplifiers;finite-difference beam propagation method;spectrum analysis