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Investigation on WDM Nonlinear Impairments Arising From the Insertion of 100-Gb/s Coherent PDM-QPSK Over Legacy Optical Networks

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8 Author(s)
Renaudier, J. ; Centre de Villarceaux, Alcatel-Lucent Bell Labs., Nozay, France ; Bertran-Pardo, O. ; Charlet, Gabriel ; Salsi, Massimiliano
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In the perspective of smooth capacity upgrades of legacy systems, we experimentally investigate the performance of one 100-Gb/s coherent polarization-division-multiplexed quaternary-phase-shift-keying (PDM-QPSK) channel inserted in a 10-Gb/s ultra-long-haul (ULH) wavelength-division-multiplexing system relying on nonzero dispersion-shifted fibers. The impact of copropagating 10-Gb/s nonreturn-to-zero (NRZ) channels operating ULH distances onto the operational power range of the inserted 100-Gb/s coherent PDM-QPSK channel is analyzed. Moreover, the performance penalties brought by copropagating 10-Gb/s NRZ channels onto 100-Gb/s PDM-QPSK data are also analyzed depending on the number of channels in the multiplex and on the introduction of guardbands between both type of channels.

Published in:

Photonics Technology Letters, IEEE  (Volume:21 ,  Issue: 24 )