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Publication Detail
Performance Comparison of Single-Sideband Direct Detection Nyquist-Subcarrier Modulation and OFDM
  • Publication Type:
    Journal article
  • Publication Sub Type:
    article
  • Authors:
    Erkilinc MS, Pachnicke S, Griesser H, Thomsen BC, Bayvel P, Killey RI
  • Publication date:
    05/2015
  • Pagination:
    2038, 2046
  • Journal:
    Lightwave Technology, Journal of
  • Volume:
    33
  • Article number:
    10
  • Print ISSN:
    0733-8724
  • Notes:
    keywords: OFDM modulation;electromagnetic interference;optical links;optical signal detection;optical transceivers;wavelength division multiplexing;EDFA-only amplification;Nyquist-SCM format;Nyquist-SCM signals;OFDM signal format;SSB orthogonal frequency-division multiplexing;WDM channel spacing;WDM transmission;bit rate 196 Gbit/s;direct detection links;direct detection transceivers;distance 320 km;distance 720 km;electronic predistortion;highest information spectral densities;maximum transmission distances;medium-haul links;modulation cardinality;nonlinearity;optical signal formats;short-haul links;signal bandwidth;signal format tolerance;signal-signal beating interference;single-sideband Nyquist pulse-shaped subcarrier modulation;single-sideband direct detection Nyquist-subcarrier modulation;square-law detection;standard SMF;wavelength-division multiplexing net information spectral densities;Amplitude modulation;OFDM;Optical fiber communication;Optical receivers;Optical sensors;Signal to noise ratio;Wavelength division multiplexing;Digital signal processing;Nyquist pulse shaping;Optical communication;direct detection;electronic pre-distortion;optical communication;orthogonal frequency division multiplexing;signal???signal beating interference;subcarrier modulation;wavelength division multiplexing
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 × 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.
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