With the advantages of high gain and output power , low noise , wide bandwidth as well as no relation with polarization , edfa changes the traditional optical - electrical - optical relay mode step by step in many fields , and becomes an indispensable device in modern optical communication systems . it saves the expensive cost in optical - electrical transition , makes equipment easy to operate and maintain 由于其本身具有高增益、高输出功率、低噪声、带宽宽、与偏振无关等优点,在很多领域和场合, edfa正逐步取代传统的光-电-光中继模式,省去光电/电光转换的昂贵成本,便于设备的运行维护,成为现代光纤通信系统中不可缺少的关键部件。
Gaas pcss have many advantages over others in response speed , the transfer efficiency of light into electricity and high voltage resistant , especially they can operate in a nonlinear mode with high gain which can reduce the triggering optical energy by 3 - 5 orders of magnitude comparing to the conventional linear mode . this makes it realistically possible to realize the miniaturization , practicality and integration of the system of pcss 。 this paper summarized pre - used ultra - wideband source circuit using pcss , and the exhaustive theoretic analysis of traditional auston circuit and pulse - forming circuit is presented Gaas光导开关与si光导开关相比具有响应速度快、传输效率高、耐高压的能力强,尤其是它除可以按常规的线性模式工作以外,还存在一种高增益的非线性工作模式,这种模式可使光导开关导通的光能比常规模式降低3 ~ 5个数量级,从而为光导开关的小型化,实用化,集成化提供了现实的可能性,因而倍受人们的关注。
It is thus of importance to develop an l - band edfa . however , a conventional l - band edfa is relatively inefficient and has low gain and high noise figure since they are operated at the tail of the erbium gain band . therefore , it is very important to design and analyze a high performance l - band edfa with simultaneously high gain , low noise and low gain ripple for a dwdm system 开发新的l - bandedfa是十分必要的，然而传统的l - bandedfa由于工作在铒光纤增益谱的尾部，其存在增益低、工作转换效率低、噪声大等缺点，因此，分析和设计符合dwdm系统发展要求的具有优良性能(高增益、低噪声、动态增益均衡)的l - bandedfa是十分有意义的。
Based on our theoretical predictions , we find optimal splicing parameters on fsm - 30s fiber splicer for low loss joints between erbium doped fiber and other single mode fibers . we also experimentally demonstrate a novel three - stage erbium - doped fiber amplifier with high gain , low noise figure , and high output power . finally , a prototype of a gain - clamped fiber amplifier is obtained with high gain ( 26 db ) , low noise figure ( 5 . 3 db ) , high output power ( 17 dbm ) , and large bandwidth ( 31 nm ) 文章研究了掺铒光纤（ edf ）与其他光纤低损耗焊接问题，得到光纤熔接机低损耗熔接的最佳参数，这对掺铒光纤放大器的科研生产具有一定的指导意义；研究了新型的三段级联泵浦优配的掺铒光纤放大器的优化光路结构，得到高增益，低噪声，大输出功率的掺铒光纤放大器；最后研制成功高增益（ 26db ） ，低噪声( 5 . 3db ) ，大输出功率( 17dbm ) ，宽带( 31nm )增益箝制掺铒光纤放大器样机。
The influence of the configuration , the pump wavelength , the bragg wavelength , the reflectivity , the pump power and the length of edf to the gain - clamped characteristics is studied . an optimal l - band gain - clamped edfa configuration with appropriate parameters of the amplifier , which can also provide a flat - gain band , are given 总之，本论文围绕光纤通信领域的国际热点问题，从理论和实验上研究了高增益、低噪声、谱平坦的掺饵光纤放大器的实现，关于edfa的特性的研究成果，我们相信能对科研生产起一定的指导作用。
We decide to use seven - sections coupled - line filter after comparing the various filter circuits , and complete the quantitative analysis and optimization design by ads , hfss etc . ( 2 ) three - stages fet low noise amplifier according to the lna ’ s design theory and guide line , we decide to use ne3210s01 fet and choose the form of three - stages , thus we can achieve high stability , low noise and high gain 通过对各种带通滤波器电路方案进行比较,确定采用七阶平行耦合微带滤波器,并利用ads , hfss等工具进行了定量的理论分析和优化设计。 (二)三级联低噪声放大器根据微波lna设计原理及指标要求,我们选用ne3210s01系列低噪声管,并采用三级放大的形式,以期获得高稳定性,低噪声,高增益。
Especially after the second world war , single radiator can not match the request of high gain , high efficiency and high concentrative electromagnetic , but what is in great need . then , scholars and researchers apply themselves to approach the array antenna to solve the problem 特别是第二次世界大战后,高增益、高辐射效率以及高集中辐射场的要求,使得单个辐射器无法达到特定的效果和要求,于是,在天线的设计工作中,为增强天线的方向性、提高天线增益,各国学者和研究人员将工作重点放到天线阵列上面。
On the base of studying imaging theory of lens , the imaging theory of laser confocal scanning microscopy was analyzed in detail in this paper , and the advancement of that the optical fiber was applied to the system was described ; on the base of completed the demonstration for whole project , the experiment scheme was designed ; the relationship between the main parameters of key devices and the resolution was deduced , and the requirements of coupling efficiency and vignetting effects to optical system was analyzed ; the design of optical system and the planar scanning controlling circuit was completed ; a new method was put forward to resolved the inherent non - liner scanning problem of the galvanometer scanner by using software liner controlling in circuit design , and the perfect planar scanning was realized ; at last the low noise , high multiple and non - distortion amplify circuit of photoelectric detector was completed 本文在透镜成像理论的基础上，系统、深入地分析了共焦扫描显微成像的机理，论述了应用单模光纤的激光共焦扫描显微成像系统的优点；进行了总体方案的论证，并设计确定了单模光纤激光共焦扫描显微成像系统的总体方案；从理论上推导分析了分辨率要求与试验系统中相关器件主要参数之间的关系，分析了系统耦合效率和渐晕现象对光学系统的设计要求；完成了方案中光学系统和二维扫描控制电路的设计，并在电路设计中采用了用软件解决检流计式光学扫描器(振镜)非线性问题的新方法，能够实现较为理想的二维模拟扫描；完成了高增益、低噪声和低失真的探测接收系统的设计和调试。
( 3 ) for a class of fully linearizable affine nonlinear systems , a wavelet network - based direct adaptive output feedback controller is presented . the nonlinearities are not required to satisfy any global growth condition and are not restricted to be linear with system parameters . a wavelet network is ued to approximate the nonlinearities of the system ( 3 )基于高增益观测器的自适应输出反馈控制思想，提出了一类可精确反馈线性化的非线性仿射系统，基于小波网络的直接自适应输出反馈控制器的设计方法，可以实现一类非线性未知或不可参数线性化的系统的渐近稳定跟踪。
