Optical Fiber Communications 4th Edition by Gerd Keiser

Exercise 7

Consider an N -node star network in which 0 dBm of optical power is coupled from any given transmitter into the star. Let the fiber loss be 0.3 dB/km. Assume the stations are located 2 km from the star, the receiver sensitivity is -38 dBm, each connector has a 1-dB loss, the excess loss in the star coupler is 3 dB, and the link margin is 3 dB.
( a ) Determine the maximum number of stations N that can be incorporated on this network.
( b ) How many stations can be attached if the receiver sensitivity is -32 dBm