Question

An optical fibre has an attenuation 3.5db/km. If 0.5mw of optical power is initially launched into the fibre, what is the power level in micro watt after 4 km? 1.99 19.9 199 0.0199

Answer 1

Answer:

$)2))2100x. \gamma \sin( \sin(e log_{bbsb}(?) ) )$

Answer 2

Answer:

output power = 19.9 micro watt