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Calculate the optical SNR at the output end of a 4000-km lightwave system designed using 50 EDFAs with 4.5-dB noise figure. Assume a fiber-cable loss

Calculate the optical SNR at the output end of a 4000-km lightwave system designed using 50 EDFAs with 4.5-dB noise figure. Assume a fiber-cable loss of 0.25 dB/km at 1550. nm.

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