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With the support of a major research grant of Zhejiang Province (No. 001101027) and the Plan of Promoting Education of Excellence of Zhejiang University in the 21st Century, this dissertation is devoted to address the above problems and fabricate an L-band EDFA with low cost, high performance and technological innovation.First the mechanism of an erbium doped fiber amplifier is introduced. Various theoretical models based on classical rate propagation equations are summarized and compared for their applications. We use a modified numerical model based on the Giles model, which agrees with the experimental results well. This serves as the theoretical base for the whole thesis and will be used to optimize the characteristics of EDFAs. A novel method based on a map of noise figure and gain is proposed to analyze efficiently the dependence of the noise figure and gain for EDFAs on the EDF length and the pump power. The characteristics of various EDFAs are studied and compared.Secondly, some important parameters are introduced to describe the characteristics of EDFAs. The methods and the experimental setups for measuring the gain and noise figure of an EDFA are emphasized. We introduce how to measure the characteristics of each component of an EDFA, especially the gain and absorption coefficient of an erbium doped fiber.Thirdly, four types of simple and novel L-band EDFA structures with low noise, high gain and low gain ripple are proposed to satisfy the requirement of a DWDM system. They can be classified into two categories. In the first category, a single ASE pumping is served asa secondary pump. This category includes the following three types. Type: a new construction using a fiber Bragg grating in an unpumped EDF section at the input side. Type: a new structure of L-Band EDFA with two-stage pumps, which utilizes the forward ASE as a second pump.

本论文本着科技创新、服务于生产实践的精神，以设计价格低廉，性能优越、结构合理简单的L-band EDFA为目标，依托浙江省科技厅重大科学基金资助项目(001101027)和浙江大学振兴教育计划资助的全光网络的搭建—《光通信技术》课程实验建设项目，展开了如下工作：首先，介绍了掺铒光纤放大器的工作原理，归纳总结了基于速率方程基础的EDFA的各种理论模型，分析比较了各个模型的特点和适用场合，最终选择完善的Giles理论模型作为本论文分析设计EDFA的理论基础；针对实际实验条件提出了修正的EDFA模型的数值计算方法；创新地提出了增益—噪声系数全局分析法，直观有效地分析了EDFA的增益和噪声系数与掺铒光纤长度和泵浦功率的依赖关系，并对各种EDFA的性能作了全面的比较；第二，介绍了掺铒光纤放大器特性参数的定义与测量方法，重点介绍了噪声系数和增益系数的测量方法及实验装置；介绍了组成掺铒光纤放大器各组件的特性测量方法，重点介绍了测量掺铒光纤参数的方法和实验装置；第三，针对WDM系统对L-band EDFA谱平坦、低噪声、高增益的要求，我们创新地提出了四种不同的L-band EDFA结构，按设计思路可以分为两大类：一类是基于单抽运二级泵浦法，这一类包括在未泵浦掺铒光纤的输入端插入一根布拉格光纤光栅的两段L-band的EDFA的新结构；基于前向ASE光作为二级泵浦源推动下一级EDF工作的泵浦分配、两段级联L-band的EDFA的新结构；基于单根光纤光栅、泵浦分配、两段级联的EDFA；另一类则是基于同时应用前后向C-band ASE作二级泵浦源的双抽运法，如基于前后向ASE光作为二级泵浦源的三段级联L-band的EDFA的新结构。

It is found that there is only slight impact on the performance of unslotted FH—CDMA system if the dependence of hit sequence is not taken into account.

模拟结果验证了本文理论分析的正确性，并证实了在非时槽FH—CDMA系统中不考虚碰撞序列的相关性对结果影响不大。

His autobiography,"Chasing the Wind", acknowledged his dependence on "partnering" every variation of air and weather to speed his unsteered balloons and his sails.

他在自传---《追风》中承认，只能任着气流和天气的每份变化来加速他那不受控制的气球和帆船。

The apparent degree of network chains for the different swollen extent of the same unswollen hydrogel sample increased linearly with the increase of swelling ratio, however, the apparent modulus did not decrease monotonously with the increase of swelling ratio. Furthermore, the dependence of apparent degree of network chains on swelling ratio had nothing to do with the swelling agent. The above results reflected the changes of entanglement and the contribution of entanglement under different swelling ratio, and the results could be explained with the theory of Flory-Erman's constrained junction model and LangleyGraessley relation.

发现同一水凝胶样品的不同溶胀程度试样经应力应变测试得出的表观网链密度随体积溶胀率的增加而线性增加，等效模量并不随溶胀程度的增加而单调减小，而表观网链密度的溶胀程度依赖性与所选用的溶胀剂无关，该结果反映了不同溶胀程度下缠结的变化及缠结对弹性的不同贡献，并可由Flory-Erman的constrained junction模型及Langley-Graessley公式得到解释。

By performance analysis, we obtain that the dependence of the long latency operations heavily influences the parallel efficiency of instructions. Based on the analysis, we optimize the codes, cache the amount irregular computations, and compute them vectorially.

通过性能分析，我们发现粒子相互作用力计算中相互关联的浮点运算严重影响了处理器的指令级并行效率，为此我们应用计算缓存的方法，将大量不规则的浮点计算进行缓存，达到一定规模后再进行向量化计算。

With the wavelength dependence of the Verdet constant, a large current could be measured by way of measuring the difference of th...

利用光纤维尔德常数随光波长变化这一特性，通过测量两种光波旋转的角度差，获得了大电流的测量值。

In the aspect of microwave metallurgy,he set forth the mechanism of microwave metallurgy,put forward a theory of voluminal reduction in microwave,taded away the dependence relation between metallization rate and compression strength of pellets and eliminated the resistances of heat transfer and mass transfer,which can enhance the matallization rate of pellets to the utmost extent.

在微波冶金方面，阐明了微波冶金的机理，提出了微波体还原的理论，打破了球团金属化率和球团强度之间的依存关系，消除了自还原过程传热传质阻力，最大限度提高了物料的金属化率。

China's dependence on oil imports is waning too.

中国对石油进口的依赖也在减少。

We consider that the lomitation and dependence of xenogamy are important factors among the factors influencing seed set.

在影响结实率的诸多因素中，异花授粉的效率以及植物对异花授粉的依赖程度是重要因素。

The article basically elaborates ADAM familial the relation with tumor. 1ADAM gene structure and functional ADAMs are familial it is an important metallic albumen enzymatic familial, belong to albumen of zincic dependence metal enzymatic super- familial, cent is two groups:っ狝 DAMs and secrete model AD-AMTSs.

本文主要阐述ADAM家族和肿瘤的关系。1ADAM基因结构和功能ADAMs家族是1个重要的金属蛋白酶家族，属于锌依靠性金属蛋白酶超家族，分为两组：膜锚ADAMs和分泌型AD-AMTSs。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。