Erbium - doped optical waveguide amplifier has received extensive attention because it has several merits , such as low - loss , high gain , small size , low facture cost , small index of noise , small polarization relativity and convenient for integration 掺铒光波导放大器具有损耗低、单位长度增益高、体积小、成本低、噪声系数低、很小的极化相关性,便于集成等特点,正受到越来越广泛的关注。
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。
