This C-band single-channel fiber amplifier is a fiber amplifier for CATV System with high stability output. Which uses high-reliability Pump lasers, and use special APC (automatic gain control) and ATC (automatic temperature control) circuits to make the output power highly stable and reliable; the special optical path design ensures good optical path indicators; the use of a highly stable and high-precision MPU (microprocessor) system makes the adjustment and display convenient, reliable and intelligent.