We propose a new regeneration scheme for highly spectral efficient formats and through numerical simulations we prove its necessity against traditional 2R solutions for future high capacity systems All-optical regeneration is seen as a promising approach to improve the capacity and reach of long haul transmission systems. In the past, a full 3R functionality (i.e. Re-amplification, Re-shaping, Re-timing) was essential for the regenerative subsystems which had to deal with the prevailing return to zero (RZ) modulated signals. With the recent introduction of highly spectral efficient signals, characterized by non-return to zero (NRZ) modulation of complex constellations (i.e. m-QAM), the re-timing functionality was overlooked and the efforts were focused on advancing only the 2R performance, through schemes that could remove the noise from the multiple amplitude and phase levels of the signal waveform [1-3]. However, in future transmission systems the channels will be densely packed and tight filtering will be required for any in-line channel selection, e.g. to perform all-optical add-drop multiplexing or signal regeneration. Unavoidably, this will give rise to timing jitter effects that will accumulate along the 2R line and drastically limit the system cascadability.
|Title of host publication||The European Conference on Lasers and Electro-Optics 2015|
|Publication status||Published - 2015|
|Event||2015 European Conference on Lasers and Electro-Optics - European Quantum Electronics Conference - Munich, Germany|
Duration: 21 Jun 2015 → 25 Jun 2015
|Conference||2015 European Conference on Lasers and Electro-Optics - European Quantum Electronics Conference|
|Abbreviated title||CLEO 2015|
|Period||21/06/15 → 25/06/15|