Optical Fiber Communications 4th Edition by Gerd Keiser

Exercise 7

A product sheet for a 2 × 2 single-mode biconical tapered coupler with a 40/60 splitting ratio states that the insertion losses are 2.7 dB for the 60-percent channel and 4.7 dB for the 40-percent channel.
( a ) If the input power P₀= 200 W, find the output levels P₁and P 2.
( b ) Find the excess loss of the coupler.
( c ) From the calculated values of P₁and P 2 , verify that the splitting ratio is 40/60.