Q- How to calculate the total fiber line loss?
1- In the DWDM system, the power loss introduced by line fiber, optical modules, and optical components is needed to be compensated for by the optical amplifier (Erbium-doped fiber amplifier or Raman amplifier).
2- The method of counting fiber attenuation greatly affects system design. The following defines six rules of counting fiber attenuation, based on bidding documents.
3- If the margin is no less than 3 dB, neglect FIU insertion loss during power calculation.