The factors that influenced the output of the laser were analyzed theoretically . the output power of the laser was observed to be related with the length of eof , the coupled - ration of the output coupler and the loss of splicing 并在掺铒光纤激光器理论分析基础上，讨论了影响激光器输出的各种因素：腔长、输出耦合比、谐振腔损耗。且作了相应的实验，与理论结果相一致。
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。
The cluster parameter k is presented to reduce upconversion , and the smaller the k , the lower the upconversion . another method to reduce upconversion is to dope al and p together , which can make the esa spectra shifted toward short wavelength 总结了两种抑制上转换发光的方法,即:改善掺铒光纤的团簇结构参数k , k越小,上转换发光效率越低; al / p共掺,使铒离子esa吸收谱往短波方向偏移。
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 。
4 . the fundamental principles of both the linear cavity fiber laser and the ring cavity fiber laser and the stability criterion for multiwavelength oscillations are introduced . several kinds of techniques to achieve mulitwavelength oscillations are summarized 4 .介绍了线形腔光纤激光器和环形腔光纤激光器的基本理论以及多波长激光器稳定振荡的条件,并总结了几种实现多波长掺铒光纤激光器的稳定振荡的方法。
We roundly investigate the chaos and hyperchaos of drefl from different aspect embodying the character of chaos and find that drefl can be in chaotic or hyperchaotic state at some conditions . it is firstly founded that the drefl has two attracting basin at some conditions 从表现混沌的不同侧面对双环掺铒光纤激光器的混沌和超混沌进行了全面研究，在一定的参数条件下，双环掺铒光纤激光器存在混沌和超混沌状态。
The dissertation focuses on fiber lasers and includes the detailed descriptions on the following subjects : 1 . experimental studies on fabry - perot cavity fiber lasers ( 1 ) the experimental study on a dual - wavelength dbr ( distributed bragg reflection ) edfl ( erbium - doped fiber laser ) is conducted 本论文以光纤激光器为主要研究对象,进行的研究工作如下: 1 . fabry - perot腔光纤激光器的实验研究( 1 )对高浓度掺铒光纤dbr双波长激光器进行了实验研究。
Theoretical result indicated that the self - q - switching in er - doped fiber laser based on sbs process was feasible in mathematics , and the conclusion has been presented that the dynamic characteristics of output pulse by sbs are effected tinily by the length of er - doped fiber in the system 仿真实验结果表明利用单模光纤的受激布里渊散射效应可在掺铒光纤激光器系统内稳定形成自调q过程,同时得到sbs产生激光脉冲动态特性受到掺铒光纤长度改变量影响不大这一结论。
( 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。
