With ultra-small form factor and low power consumption, Accelink Built-in EDFA can be integrated into various kinds of DCO module in CFP/CFP2/QSFP-DD/OSFP housing, or Transponder Linecard flexibly to meet customization requirements. It can maximize space utilization, effectively compensate insertion loss of all kinds of optical devices in DCO or Transponder with limited space and power, and operate in full C band to achieve single-wavelength optical power amplification.