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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 29,
  • Issue 15,
  • pp. 2310-2318
  • (2011)

Transmission of 9 x 138 Gb/s Prefiltered PM-8QAM Signals Over 4000 km of Pure Silica-Core Fiber

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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

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