1. An optical communications link is to be built using fiberrated for 5000 MHz-km. The light source is a laser diode producing0.25 mW. The fiber has losses of 0.4 dB/km and is available in 2 kmlengths. It can be spliced with a loss of 0.2 dB per splice, andthere will be a 5 dB loss in the connectors throughout the system.The receiver used has a sensitivity of -30 dBm. The source risetime is 2 ns, and the receiver rise time is 4 ns.
a) Prepare a loss budget for a link 20 km long, and calculatethe system margin in dB.
b) What
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