Abstract
We discuss optical multi-band orthogonal frequency division multiplexing
(OFDM) and show that by using multiple parallel OFDM bands, the required bandwidth
of the digital-to-analogue/ analogue-to-digital converters and the required
cyclic prefix can significantly be reduced. With the help of four OFDM bands
and polarization division multiplexing (PDM) we report continuously detectable
transmission of 10$\,\times\,$121.9-Gb/s (112.6-Gb/s without OFDM overhead) at 50-GHz channel
spacing over 1,000-km standard single mode fiber (SSMF) without any inline
dispersion compensation. In this experiment 8 QAM subcarrier modulation is
used which confines the spectrum of the 121.9 Gb/s PDM-OFDM signal within
a 22.8 GHz optical bandwidth. Moreover, we propose a digital signal processing
method to reduce the matching requirements for the wideband transmitter IQ
mixer structures required for PDM-OFDM.
© 2009 IEEE
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