CAJ | 학술논문

由于掺铒光纤放大器（EDFA ）存在增益，相比于传输光纤它有较小的调制不稳定性阈值，使其很容易受到调制不稳定性的影响。本文用微扰法分析基本的非线性薛定谔方程，研究色散缓变掺铒光纤放大器的调制不稳定性，分析其调制不稳定性积分增益谱与输入信号功率、放大器增益、放大器的长度、光纤纵向色散变化参量的关系。结果显示增大光纤纵向色散变化参量值是减小调制不稳定性对放大器影响的有效途径。通过分析调制不稳定增益产生长度，表明合理的选择放大器的长度可以消除调制不稳定性增益的产生。
유우참이광섬방대기（EDFA ）존재증익，상비우전수광섬타유교소적조제불은정성역치，사기흔용역수도조제불은정성적영향。본문용미우법분석기본적비선성설정악방정，연구색산완변참이광섬방대기적조제불은정성，분석기조제불은정성적분증익보여수입신호공솔、방대기증익、방대기적장도、광섬종향색산변화삼량적관계。결과현시증대광섬종향색산변화삼량치시감소조제불은정성대방대기영향적유효도경。통과분석조제불은정증익산생장도，표명합리적선택방대기적장도가이소제조제불은정성증익적산생。
The existence of gain in erbium-doped fiber amplifiers (EDFA) lowers the threshold for modu-lation instability considerably compared with the case of undoped fibers ,w hich makes it very vulnerable to the influence of modulation instability .Modulation instability in dispersion -decreasing erbium -doped fiber amplifier is studied through a perturbation analysis of the underlying nonlinear Schrodinger equation .The relations of integral gain spectrum of modulation instability to the input signal power , amplifier gain ,the length of amplifiers ,optical fiber longitudinal dispersion change parameters are ana-lyzed .The results show that increasing fiber longitudinal dispersion change parameter is an effective way to diminish the impact of modulation instability to amplifier ,and modulation instability gain spectrum can be eliminated through making use of amplifier length of reasonable choice by analyzing modulation instability gain’s generation length .