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1.掺铒光纤放大器 EDFA这是 DWDM 系统的核心器件,要求与信号的速率和格式无关,并能同时放大全部光波长携带的信号。由于 DWDM 系统的应用要求在不中断业务的条件下,逐渐增加波长数,即能平滑地逐步增大系统容量,满足不断增长的业务需求,故要求 EDFA具有下列特性:(1)允许平滑的增加波长;(2)随着波长数增加或减少,输入光功率增大或减小时也能稳定的工作;(3)在系统的最大传送带宽内有规定的平坦增益波长特性,
1. Erbium Doped Fiber Amplifier EDFA This is the heart of the DWDM system and requires no signal-rate and formatting and amplifies all optical wavelength-carrying signals simultaneously. As DWDM systems require that the number of wavelengths be gradually increased without interruption of service, that is, the capacity of the system can be gradually and smoothly increased to meet the ever-increasing demands of the business. Therefore, the EDFA is required to have the following features: (1) to allow a smooth increase Wavelength; (2) With the wavelength number increases or decreases, the input optical power increases or decreases when the work can also be stable; (3) the maximum transmission bandwidth of the system has specified flat gain wavelength characteristics,