【作者】 陈璐；

【导师】 马晓明；

【作者基本信息】 西安电子科技大学 ， 光通信， 2009， 硕士

【摘要】 光纤放大器（OFA）是实现全光型光纤通信的关键部件。它具有易集成、高增益、低噪声和带宽大的特点;它有效地提高光信号传输距离,减少中继站数目,降低系统成本,它的研制和改进在全球范围内仍方兴未艾。光纤放大器尤其是掺铒光纤放大器（EDFA）广泛地应用于各种光通信系统特别是波分复用（WDM）系统中。但随着WDM系统传输信道的不断增加,传输码速的不断提高和传输距离的不断增加。当EDFA在WDM系统中用作级联放大时,EDFA增益谱的不平坦会逐渐累积放大,严重影响系统性能,因此要求WDM系统中的EDFA具有恒定的增益、很宽的动态范围、平坦的动态增益谱。Er³⁺/Yb³⁺共掺光纤放大器（EYDFA）是对EDFA的一种改进,它把Er³⁺/Yb³⁺共掺光纤作为增益介质代替EDFA的掺铒光纤,从而可以改善光纤放大器的整体性能。本文系统论述了铒/镱共掺放大器实现光信号的放大原理、速率方程、拓扑结构以及影响光放大器性能的各种因素,分析了两段级联的铒/镱共掺放大器的原理以及各个参数对其性能的影响。通过仿真证明了理论分析的正确性,并可根据仿真结果进一步应用于实践中。本文的创新点在于,通过在光放大器的增益介质中间加入光隔离器隔离了光信号在放大过程中产生的反向放大自发辐射（ASE）,使泵浦功率主要被用来放大信号光,这样可在相同的条件下获得更大的增益。更多还原

【Abstract】 The optical fiber amplifier (OFA) realizes the entire light fiber opticcommunications key component. It easy to integrate, the high gain, the low noiseand the band width major characteristic ,It enhances the light signal transmittingrange effectively, reduces the relay station number, reduces the system cost, itsdevelopment and the improvement globally were still on the rise. OFA especiallyerbium-doped fiber amplifier is widely used in a variety of optical communicationsystems, especially wavelength division multiplexing (WDM) systems. However, asthe transmission channel WDM system, the increasing speed transmission codecontinuous improvement and increasing transmission distance. When the EDFA inthe WDM system when used as a cascade, EDFA gain spectrum is not flat willgradually enlarge the cumulative seriously affect system performance, thereforerequested the WDM system with constant EDFA gain, wide dynamic range, flatdynamic gain spectrum. erbium/ytterbium Co-doped fiber amplifier (EYDFA) ofEDFA’s an improvement, it uses erbium/ytterbium co-doped fiber as the gainmedium instead of the EDFA erbium-doped fiber, which could improve the overallperformance of fiber amplifier.The paper system elaborated erbium/ytterbium co-doping amplifier achieve thelight signal enlargement principle, the rate equation, topology as well as influencelight amplifier performance each kind of factor, has analyzed two section of cascadeerbium/ytterbium co-doping amplifier’s principle as well as each parameter to itsperformance influence. Had proven through the simulation theoretical analysis’saccuracy, and may further apply according to the simulation result in the practice.The paper’s innovation spot lies through joined the light isolation among lightamplifier’s gain medium to isolate the light signal reverse Amplified SpontaneousEmission (ASE) which produced in the enlargement process, caused the pump powermainly to use for the signal amplification light, like this obtained a bigger gain underthe same condition.更多还原