The recent research and development situations of the optical fiber amplifier including erbium doped fiber amplifier ( edfa ) , thulium doped fiber amplifier ( tdfa ) , raman fiber amplifier ( fra ) and semiconductor optical amplifier ( soa ) domestic and abroad are described , and the trend of the amplifiers are discussed , the characteristics of them are compared 摘要介绍了国内外光放大器的最新研究动态，主要包括掺铒光纤放大器、掺铥光纤放大器、光纤喇曼放大器及半导体光放大器，并指出相关放大器的发展趋势，最后对光纤放大器的特性进行了比较分析。
The emergence of erbium - doped fiber amplifier is the landmark in the history of optical fiber communication . by utilizing edfas , all - optical relay is realized , transmission distance is much lengthened , and the development of wdm / dwdm ( wavelength - division multiplexing / dense wdm ) communication systems is generally accelerated 掺铒光纤放大器的出现是光纤通信发展史中重要的里程碑, edfa使用全光中继来代替了光-电-光中继,极大地降低了系统的成本和延长了信号传输的距离,同时还推动了wdm / dwdm通信系统的整体发展。
Based on the above background and under the support of tianjin natural science foundation project : intelligent fiber amplifiers and light sources , tianjin natural science foundation project : ( c + l ) broadband fiber amplifier and nankai - delta ( tianjin ) project : development of gain flattened erbium - doped fiber amplifiers , this dissertation is mainly focused on the study of novel gc - edfa , gain and nf ( noise figure ) improvement of edfa , light sources , multi - wavelength fiber laser and voa ( variable optical attenuator ) 基于以上背景,在天津市重点基金项目? ?智能型光纤放大器和光源的研究、天津市重点基金项目? ? ( c + l )超宽带掺杂光纤放大器和南开-达尔泰(天津)项目? ?开发增益平坦的掺铒光纤放大器的支持下,本论文主要围绕新型gc - edfa 、 edfa性能的优化、增益控制用光源、多波长光纤激光器以及可调光衰减器等课题进行了理论和实验研究。
Then considering the disadvantage of edfa and ydfa , the following works are accomplished , including fabricating er / yb co - doped phosphate glass material , testing each chemic and physical charicteristics of er / yb co - doped phosphate glass and designing double clading single mode fiber etc . after introducing gain theory of edfa and ydfa , the rate equation and propagation equation of er / yb co - doped phosphate glass fiber are simplified , and each factors relating to the gain of fiber amplifiers , such as fiber leghth , pumping power , signal power and wavelegth , ion concentration etc . are also described 在简要介绍掺铒光纤放大器和掺镱光纤放器增益理论之后,从铒镱共掺光纤铒镱离子的速率方程出发,对铒镱共掺的速率方程和传播方程进行简化,分析了光纤长度,泵浦功率、信号波长及离子掺杂浓度等因素对铒镱共掺磷酸盐玻璃光纤增益的影响。阐述并分析了磷酸盐玻璃增益介质的各种物理和化学性质。
Meanwhile , with the development of wdm / dwdm communication systems , more and more attention is paid on the edfas with broader bandwidth , good gain and noise feature , and gain clamping , etc . according to the tianjin natural science foundation project : intelligent fiber amplifiers and light sources , the tianjin natural science foundation project : ( c + l ) broadband fiber amplifier and the nankai - delta ( tianjin ) project : development of gain flattened erbium - doped fiber amplifiers , this dissertation is mainly focused on the study of novel gain - clamped edfa , light sources , multi - wavelength fiber laser and variable optical attenuator for gain - clamped usage , gain and noise improvement of edfa , and broadband edfa Wdm / dwdm通信系统的发展又需要edfa具有更大的带宽、优良的增益和噪声特性和增益控制等功能。基于上面的情况,并结合天津市重点基金项目? ?智能光纤放大器光源的研究、天津市重点基金项目? ? ( c + l )超宽带掺杂光纤放大器和南开-达尔泰(天津)项目? ?开发增益平坦的掺铒光纤放大器等课题,论文主要围绕新型增益控制edfa 、增益控制用光源、多波长激光器及可调光衰减器、 edfa性能优化和超宽带edfa等方面进行了理论和实验研究。
Integration of optical communication devices is the development direction of current optical communication system . erbium - doped optical waveguide amplifier is a novel optical amplifier after erbium - doped fiber - optic amplifier and semiconductor optical waveguides amplifier , it has received great attention for gain at 1 . 535 m 工作于1 . 55 m光通信窗口的掺铒集成光波导放大器( edwa )是继掺铒光纤放大器( edfa ) 、半导体光放大器之后的又一新型光放大器,近年来引起人们极大的兴趣。
Because of the appearance of erbium doped fiber amplifier ( edfa ) , the problem of optical fiber loss has been solved basically . then people ' s attention is more and more concentrating on the research of the optical fiber communication system which is limited by optical fiber dispersion instead of that which is limited by optical fiber loss 由于掺铒光纤放大器( edfa )的出现，基本上解决了光纤损耗问题，从而使人们的注意力越来越多地从受损耗限制的光纤通信系统转向受色散限制也即受带宽限制的光纤通信系统的研究。
It is firstly studied the gain - clamped mechanism of erbim - doped fiber amplifier . we find a solution to obtain high gain with large output power over gain - clamped erbium - doped fiber amplifier . then we examine and analyze the relevant factors which affect the characteristics of amplifier 本论文以福建省邮电科学研究所的合作项目为依托，基于对增益箝制机制及掺铒光纤放大器的参数及结构的选择可以影响掺铒光纤放大器性能的认识，围绕高增益、大输出功率的全光增益箝制掺铒光纤放大器进行实验研究。
Coupling efficiency not only affects fiber communication relay distance , but also affects the performance of edfa and semiconductor light amplifier ( sla ) . so it is very important to improve coupling efficiency and reduce its cost . according coupling theory , the coupling of laser diode to single mode fiber is to meet the mode field diameter match and the phase match 它不仅直接影响光纤传输的中继距离，而且对改善ld泵浦掺铒光纤放大器( ldp - edfa ) ， ld泵浦固体半导体激光器( ldp - ssl ) 、半导体光放大( sla )等光通信器件及系统的性能上，在提高他们的性价比有着十分重要的意义。
