The technology of wdm combined with edfa can take fully advantage of capability of fibers , being a premium method of realizing high - capacity , long - haul , high - speed communications 波分复用( wdm )和掺铒光纤放大器( edfa )的结合应用是充分挖掘光纤带宽能力，实现大容量、高速率、长距离通信的最佳手段。
The erbium doped fiber amplifier has been tested in the direct amplifier station of institute of fujian telecommunications for the first time in china . the experiment was very successful 并将研制成功的掺铒光纤放大器首次运用到合作单位福建邮电科学研究所的光纤直放机上进行线路传输实验，实验十分成功。
To be recycled , the backward ase was routed to the input of edf by an optical circulator . this method is much use for reference to enhance the gain of l - edfa in broadband link 这种利用光环形器将后向的ase再引入铒光纤的前端,重复利用ase的方法对超宽带连接中提高l -波段掺铒光纤放大器的增益也有借鉴价值。
We outlined the history of optic amplifiers , analysed the advantages and disadvantages of edfa and fra , and the application area of rare earth doped tellurite glass amplification fiber 摘要文章介绍了光纤放大的研究历史，分析了掺铒光纤放大器( edfa )和光纤拉曼放大器的优势和劣势，指明了稀土掺杂碲酸盐放大光纤的应用领城。
In the design of optically amplified links for wdm applications , in which the number and power level of the input channels may vary randomly in time as in a network scenario , it is thus essential to stablize the amplifier gain profile 但其增益谱并不平坦，这就要求用于波分复用系统的掺铒光纤放大器要有合适的增益、噪声系数和输出功率，还要求增益的动态平衡。
Erbium doped fiber amplifier ( edfa ) is a key part in an optical fiber communication system . combined with the dense wavelength division multiplexing ( dwdm ) technology , optical fiber amplifier is the current trend of optical fiber communication 掺铒光纤放大器( edfa )是光纤通信系统中的关键器件，它和密集波分复用( dwdm )技术的紧密结合是当前通信技术的发展主流。
With the updating of wdm system and development of optical transition network , gain - clamped erbium - doped fiber amplifier ( gc - edfa ) fixes the problem of gain fluctuation and vibrating when input power and upload channel numbers are changing 随着wdm系统的升级及光传送网络的发展,增益控制掺铒光纤放大器( gc - edfa )在输入功率和通道数目变化时维持放大器增益稳定方面,发挥着日益重要的作用。
4 . the lpfgs are used in single wavelength er - doped fiber amplifiers ( edfas ) as a spontaneous emission noise ( ase ) filter , and the gain of the edfa is increased by 7db and the noise figure ( nf ) is decreased by 0 . 5db , for the first time 4 、成功研制了掺铒光纤放大器,首次将高频co2激光脉冲写入的长周期光纤光栅应用到掺铒光纤放大器中作为自发辐射噪声滤波器,使edfa的增益提高了7db 、噪声系数降低了0 . 5db 。
( 3 ) . the flattening arithmetic of an edfa was presented based on the inter - correlative function between the gain spectrum function of the edfa and that of the reserve transmission spectrum of the lpfg . for optimal matching between the two spectra , the flattening arithmetic calculates the variation of the resonant amplitude and wavelength of the lpfg Iii .提出了一种动态增益均衡的平坦算法，这种算法的本质就是利用掺铒光纤放大器增益谱函数和新型长周期光纤光栅的透射谱反转谱函数的相关性，给出新型长周期光纤光栅谐振峰幅度和位置的调节量，使改变后的新型长周期光纤光栅的反转谱线能和edfa的增益输出谱线进行最佳匹配。
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。
