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An analog system has a bandwidth of 10 MHz, a photodetector of = 0.5 A/W and ID = 1 nA, and a SNR of 40 dB. The receiver's temperature is 270 C and...

An analog system has a bandwidth of 10 MHz, a photodetector of ρ = 0.5 A/W and ID = 1 nA, and a SNR of 40 dB. The receiver’s temperature is 270 C and the load resistance is 50 Ω.
(a) How much optic power must reach the receiver?
(b) complete the system design if the fiber length is 5 km.

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