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We discuss coherent optical orthogonal frequency division multiplexing (CO-OFDM) as a suitable modulation technique for long-haul transmission systems. Several design and implementation aspects of a CO-OFDM system are reviewed, but we especially focus on phase noise compensation. As conventional CO-OFDM transmission systems are very sensitive to laser phase noise a novel method to compensate for phase...
In this paper, pre-emphasis and RF-pilot tone phase noise compensation are discussed for coherent OFDM transmission systems. It is shown that only 1.6% of the total power is required for the RF-pilot for optimal phase noise compensation.
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