Abstract
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 noise is introduced. With the help of this phase noise
compensation method we show continuously detectable OFDM transmission at 25.8
Gb/s data rate (20 Gb/s after coding) over 4160-km SSMF without dispersion
compensation.
© 2007 IEEE
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