Fiber Optic Power Loss Budget - FTI Packages

With the FTI Packages,  the link attenuation (Optical Power Loss) must be calculated for each fiber cabling run. 
Allowable loss: 
  • Connector : 0.75 dB 
  • Splice : 0.3 dB 
  • Cable @ 850nm : 3.5 db / km  
  • Cable @ 1300nm : 1.5 dB / km  
Assuming a 50 meter link had two connectors & a splice. We decide to measure at 1300 nm, the affordable power loss budget would be calculated in the following way:   

Mated Connector

0.75 dB

Cable @ 1300nm

0.075 dB (1.5 dB / km)


0.3 dB

Mated Connector

0.75 dB

Power Loss Budget

1.875 dB

Do not accept a Power Loss Reading without a calculated Power Loss Budget.  For certification to ANSI/TIA/EIA 568-B, ISO/IEC 11801 and EN50173, you must test at both wavelengths in one direction and record the allowable loss budget. 

Learn About:
- Fiber Testing