Abstract
Direct detection transceivers offer advantages, including low cost and
complexity, in short- and medium-haul links. We carried out studies seeking to identify
the signal formats which offer the highest information spectral densities and maximum
transmission distances for direct detection links. The performance of two spectrally
efficient optical signal formats, single-sideband (SSB) Nyquist pulse-shaped subcarrier
modulation (SCM) and SSB orthogonal frequency-division multiplexing (OFDM), are compared
by means of simulations. The comparison is performed for a range of wavelength-division
multiplexing (WDM) net information spectral densities up to 2.0 b/s/Hz by varying the
signal bandwidth, modulation cardinality, and WDM channel spacing. The signal formats’
tolerance to signal–signal beating interference, resulting from square-law detection, is
investigated, and the Nyquist-SCM format is found to suffer lower penalties from this
nonlinearity at high information spectral densities. In 7 x 28 Gb/s WDM transmission at 2.0 b/s/Hz (with electronic predistortion
and EDFA-only amplification), Nyquist-SCM signals can be transmitted over distances of
up to 720 km of standard SMF in comparison to a maximum of 320 km with the OFDM signal
format.
© 2015 OAPA
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