EYDFA (Erbium Yterbium Doped Fiber Amplifier) series are mainly used in AM CATV, digital CATV, FTTx PON,which is a high power multiport output optical fiber amplifier.It’s spectral bandwidth is in 1540 ~ 1563nm,whichis mainly designed for CATV or 1 ~ 8 ITU wavelength. It can provide a flexible low-cost solution to CATV system for large and medium cities in large area and fiber to the home.