Abstract
Orthogonal frequency-division multiplexing (OFDM) is a multicarrier
modulation format in which the data are transmitted with a set of orthogonal
subcarriers. Recently, this modulation format has been actively explored in
the field of optical communications to take advantages of its high spectral
efficiency and resilience to chromatic and polarization dispersion. However,
to realize the optical OFDM at 100 Gb/s and beyond requires extremely high
electronic bandwidth for the electronic signal processing elements. In this
paper, we investigate orthogonal-band-multiplexed OFDM (OBM-OFDM) as a suitable
modulation and multiplexing scheme for achieving bandwidth scalable and spectral
efficient long-haul transmission systems. The OBM-OFDM signal can be implemented
in either RF domain, or optical domain, or a combination of both domains.
Using the scheme of OBM-OFDM, we show the successful transmission of 107 Gb/s
data rate over 1000-km standard single-mode fiber (SSMF) without optical dispersion
compensation and without Raman amplification. The demonstrated OBM-OFDM system
is realized in optical domain which employs 2 $\times$ 2 MIMO-OFDM signal processing
and achieves high optical spectral efficiency of 3.3 bit/s/Hz using 4-QAM
encoding. Additionally, we perform numerical simulation of 107-Gb/s CO-OFDM
transmission for both single-channel and wavelength-division-multiplexed (WDM)
systems. We find that the $Q$-factor of OBM-OFDM measured using uniform filling
of OFDM subbands is in fact more conservative, in particular, is 1.2 dB and
0.4 dB lower than using random filling for single-channel and WDM systems,
respectively.
© 2009 IEEE
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