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A 16×112 Gb/s field trial with EDFA only was performed over legacy fiber infrastructure partially with high PMD. Based on 43 Gb/s components we demonstrate by use of 112 Gb/s NRZ-DQPSK modulation format Metro DWDM transmission with carrier-grade margins of more than 4 dB over ultimate Metro distances.
The Erbium-doped Fiber Amplifier (EDFA) is a key technical feature in nearly every optical undersea transmission system. This paper reviews simple performance enhancing Raman and ROPA assisted amplifier architectures.
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