To verify if the planned fiber connection will work:
Fiber Loss Formula:
Loss = (Fiber Attenuation x km)
+ (Splice Attenuation x # of splices)
+ (Connector Attenuation x # of connectors)
+ (Safety Margin)
= Total Loss
Example using 10 km run of 1310 SM fiber
Loss = (0.35 dB/km x 10km) = 3.50 dB
+ (0.01 dB/splice x 1splice) = 0.01 dB
+ (0.5 dB/connector x 2connector) = 1.00 dB
+ (3 dB Safety) = 3.00 dB
= 7.51 dB total loss
Attenuation check in the field should be better then calculated.
Then compare that to budget: Power Budget = (Launch Power) - (Receive Sensitivity)
Good to read pdf or source pdf
(look up http://www.imcnetworks.com/)