The product is high output power C-Band Er co-doped or Er-Yb co-doped double cladding optical  fiber amplifier. The key components of the product are high reliability multimode PUMP laser  and the double cladding optical fiber. A proprietary ATC (Automatic Temperature Control) and  APC (Automatic Power Control) circuit insures the high stability and reliability output power, the  unique optical circuit design ensures the excellent optical performance. The high stability and  high precision MPU system to ensure the control, adjustment and display are intelligent and  easy