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A 2.5 Gbit/s data transmission system must span a distance of 4000km using a 20mW, 1550 nm laser source, with 24dBm gain optical amplifiers every

A 2.5 Gbit/s data transmission system must span a distance of 4000km using a 20mW, 1550 nm laser source, with 24dBm gain optical amplifiers every 80km. If the fibre loss is 0.3dB/km at 1550 nm and there is one 0.1 dB splice every 16km, what is the system margin if the sensitivity of a receiver is -34 dBm?

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