Abstract
We experimentally demonstrated the application in ultrahigh spectral density
long-haul optical systems of tight prefiltering to generate “quasi-Nyquist wavelength
division multiplexing” signals together with the use of pure-silica core fiber and
hybrid Raman/erbium-doped fiber amplification. The transmission of
polarization-multiplexed quadrature-amplitude modulation with 8 symbols (PM-8QAM) at 138
Gb/s and channel spacing equal to 1.22 x (symbol rate) was demonstrated,
reaching over 4000 km at net spectral efficiency (SE) of 4.1 b/s/Hz. In our experiment,
we achieved to date highest per-carrier symbol rate (23 Gbaud), SE (4.1 b/s/Hz), and
(SE) x (distance) product (16655 b/s/Hz·km) for non-orthogonal
frequency-division multiplexing transmission using PM-8QAM modulation.
© 2011 IEEE
PDF Article
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