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Publication Detail
Spectrally Efficient WDM Nyquist Pulse-Shaped 16-QAM Subcarrier Modulation Transmission With Direct Detection
  • Publication Type:
    Journal article
  • Publication Sub Type:
  • Authors:
    Erkilinc MS, Li Z, Pachnicke S, Griesser H, Thomsen BC, Bayvel P, Killey RI
  • Publication date:
  • Pagination:
    3147, 3155
  • Journal:
    Lightwave Technology, Journal of
  • Volume:
  • Article number:
  • Print ISSN:
  • Notes:
    keywords: analogue-digital conversion;optical modulation;optical transceivers;photodiodes;quadrature amplitude modulation;signal detection;wavelength division multiplexing;wireless channels;WDM Nyquist pulse-shaped QAM subcarrier modulation transmission channel;cost-effective transceiver;direct detection links;direct detection receiver sensitivity performance;information spectral density;low-complexity transceiver;medium-haul optical communication system;optical ISD;optical signal-to-noise ratio;quadrature amplitude modulation;short-haul optical communication system;single analog-to-digital converter;single-ended photodiode;wavelength division multiplexed transmission;Amplitude modulation;Optical attenuators;Optical fiber communication;Optical modulation;Optical receivers;Optical transmitters;Wavelength division multiplexing;Digital signal processing;Nyquist pulse shaping;Optical fiber communication;digital signal processing;direct detection;information spectral density;optical fiber communication;single sideband signaling;subcarrier modulation;transceiver design;wavelength division multiplexing
The ability to transmit signals with high information spectral density (ISD) using low-complexity and cost-effective transceivers is essential for short- and medium-haul optical communication systems. Consequently, spectrally efficient direct detection transceiver-based solutions are attractive for such applications. In this paper, we experimentally demonstrate the wavelength-division multiplexed (WDM) transmission of 7×12 GHz-spaced dispersion pre-compensated Nyquist pulse-shaped 16-QAM subcarrier modulated channels operating at a net bit rate of 24 Gb/s per channel, and achieving a net optical ISD of 2.0 b/s/Hz. The direct detection receiver used in our experiment consisted of a single-ended photodiode and a single analog-to-digital converter. The carrier-to-signal power ratio at different values of optical signal-to-noise ratio was optimized to maximize the receiver sensitivity performance. The transmission experiments were carried out using a recirculating fiber loop with uncompensated standard single-mode fiber and EDFA-only amplification. The maximum achieved transmission distances for single channel and WDM signals were 727 and 323 km below the bit-error ratio of 3.8 × 10-3, respectively. To the best of our knowledge, this is the highest achieved ISD for WDM transmission in direct detection links over such distances.
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