What is required transmitted power to satisfy snr constraint


Assignment:

We want to design a submarine fiber optical system 2000 km long. The fiber has a specific attenuation of 0.05 dB/km, a dispersion coefficient of 0.01 ns/km, while the transmitted signal has bandwidth B = 100 kHz centered at f0 = 1 MHz. Let the required output SNR be 40 dB and let the noise figure of the receiver be 5 dB. What is the required transmitted power to satisfy the SNR constraint?

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