【作者】 张良；

【导师】 向望华；

【作者基本信息】 天津大学 ， 物理电子学， 2004， 硕士

【摘要】 本论文就目前光通讯系统中最主要的两种激光器光源做了全面的论述,文章第一部分对多量子阱半导体外腔锁模激光器进行了理论和实验研究;第二部分对环形腔掺铒光纤激光器和光纤光栅多波长掺铒光纤激光器进行了理论和实验研究,为光纤激光器的下一步研究和应用奠定了理论和实验基础。本文主要做了以下几个方面的具体工作:推导了注入型半导体激光器载流子密度和光子密度的速率方程,建立了这种激光器在脉冲电流调制时瞬态响应特性的理论模型,并利用数值计算的方法对比分析了光增益与载流子密度呈线性关系和呈对数关系时的瞬态驰豫振荡曲线,证明了对数关系是更准确的模型,分析了注入电流和量子阱阱数对瞬态响应曲线的影响,最后给出了最佳量子阱阱数的数值计算结果。建立了外腔激光器调整机构,封装了半导体激光器管芯、设计制作了直流偏置稳压电源,实现了平面镜反馈和反射光栅反馈外腔连续激光输出,输出激光光谱宽度分别是5nm和2nm,并利用反射光栅实现了80nm范围的激光波长调谐。推导了环形腔掺铒光纤激光器的理论模型,分析了腔内损耗和耦合器输出比例对于激光器输出特性的影响,解释了腔内损耗、耦合输出比与激光器输出功率、阈值功率和斜率效率的关系,数值计算了在一定泵浦功率下激光器输出功率、阈值功率与掺铒光纤长度的关系,这些工作是优化激光器结构设计工作很重要的参考依据。实验论证了耦合器耦合输出比例分别为10%、20%、50%、80%、90%的环形腔结构所得到的不同输出特性,给出了激射波长变化的数据和阈值功率及输出功率变化的曲线,利用光纤光栅实现了环形腔光纤激光器双波长及三波长振荡。本文对目前主要的两种激光光源做了理论分析、数值模拟和相应的实验研究,得到了很多有意义的结论,对今后的实验研究具有一定的参考价值,为今后通讯光源技术的推广和发展打下了基础。更多还原

【Abstract】 In this dissertation, theoretical and experimental studies of two kinds of laser foroptical communications are presented. First, multi-quantum-well laser is discussed;Er3+ doped fiber laser is the mainly content. Both of them are the most important lightsource in optical communication system, this dissertation give a lot of meaningfulstudies in this field.Several aspects were carried out as follows: Build carrier density and photon density rate equation about injectedsemiconductor laser, the theoretical model is set up. Using numericalcalculation, linear relationship and logarithmic relationship of optical gainand carrier density are considered respectively, by comparison we findlogarithmic relationship is much better. And we also analyze how the currentand the quantum well number affect the transient response. Set up an mechanism adjustment for external laser, design a direct currentbias voltage regulator, realize feedback by mirror and grating to makeexternal laser, get a spectral widths of 5nm and 2nm. With grating rotation,make the wavelength tuning over of 80nm. Derive a theoretical model of ring cavity fiber laser. Analyze the effect onlaser’s output characteristics gave by cavity loss and coupler’s outputefficiency. Confirm the relationship between EDF’ length and the outputpower and threshold power. In experiment, when coupler’s output efficiency is 10%、20%、50%、80%、90% respectively, we get the laser’s corresponding output data. With FBG,we realize dual-wavelength and triple-wavelength operation.In this dissertation, theoretical studies, numerical calculations and experimentalstudies are the main work. Some significant results are achieved. So that it lays thefoundation for light source technology development and scientific research in thisfield.更多还原