Insertion of 100Gb/s coherent PDM-QPSK channels over legacy optical networks relying on low chromatic dispersion fibres

  • Authors:

  • Oriol Bertran-Pardo;Jérémie Renaudier;Gabriel Charlet;Patrice Tran;Haïk Mardoyan;Massimiliano Salsi;Marco Bertolini;Sébastien Bigo

  • Affiliations:

  • Alcatel-Lucent Bell Labs, Nozay, France;Alcatel-Lucent Bell Labs, Nozay, France;Alcatel-Lucent Bell Labs, Nozay, France;Alcatel-Lucent Bell Labs, Nozay, France;Alcatel-Lucent Bell Labs, Nozay, France;Alcatel-Lucent Bell Labs, Nozay, France;-;Alcatel-Lucent Bell Labs, Nozay, France

  • Venue:
  • GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
  • Year:
  • 2009

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Abstract

We investigate the potential of 100Gb/s polarization division multiplexed (PDM-) quadrature phase shift keying (QPSK) paired with coherent detection to enable the future capacity upgrade of current networks designed for 10Gb/s nonreturn to zero (NRZ) on-off keying data. We experimentally assess the tolerance to nonlinear effects of such a solution over optical systems based on low chromatic dispersion fibres. We particularly study the performance penalties brought by copropagating channels (either PDM-QPSK or 10Gb/s NRZ) onto 100Gb/s PDM-QPSK data, in which both polarisation tributaries are over-modulated with return-to-zero and temporally interleaved by half a symbol period. Besides, we investigate one option to overcome these limitations: introducing band-gaps in the multiplex.