March 01, 2017

Field Trial of a 1 Tbit/s Super-Channel Network Using Probabilistically Shaped Constellations

  • Buchali F.
  • Idler W.
  • Lach E.
  • Schmalen L.

We successfully tested the suitability of probabilistically shaped constellations in a German nationwide fibre ring of the R&D field test network of Deutsche Telekom. In this ring eight German cities can be reached by add/drop nodes implemented by passive optical add/drop multiplexers, offering 12 bands of 400 GHz widths at the extended C-band. Multiple cascaded add/drop multiplexer are reducing the available bandwidth and we respectively applied of 150 GHz and 200 GHz, to transmit a 1 Tbit/s 4-carriers super-channel with an extended family of probabilistically shaped constellations using 16QAM, 36QAM and 64QAM. We verified in the field environment by two examples, that probabilistically shaping is outperforming standard 64QAM formats in reach. We experimentally tested two typical 1 Tb/s working paths with 420km and 920km demonstrating spectral efficiencies of 6.75 and 5 bit/s/Hz. The reach of about 1500km was extrapolated for a 1 Tb/s super-channel in a 200 GHz bandwidth. For longer distances the bitrates have to be reduced and for the longest bi-directional path of the test network, i.e. a protection path of 2,160 km, the maximum bitrate was 800 Gb/s

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Recent Publications

March 23, 2017

Performance Comparison of Capacity-Achieving Modulation Formats for Transoceanic Optical Systems

  • Fernandez De Jauregui Ruiz I.
  • Ghazisaeidi A.
  • Tran P.

We experimentally compare the performance of geometrically-shaped (64APSK) and probabilistically-shaped 64QAM (PS64QAM) formats considering linear and nonlinear penalties.

March 20, 2017

LWIP and Wi-Fi Boost Link Management

  • K S.
  • Kim B.
  • Ling J.
  • Lopez-Perez D.
  • Ming Ding
  • Vasudevan S.

3GPP LWIP Release 13 technology and its prestandard version Wi-Fi Boost have recently emerged as an efficient LTE and Wi-Fi integration at the IP layer, allowing uplink on LTE and downlink on Wi-Fi. This solves all the contention problems of Wi-Fi and allows an optimum usage of the unlicensed band ...

March 13, 2017

Advanced C+L-Band Transoceanic Transmission Systems Based on Probabilistically-Shaped PDM-64QAM

  • Brindel P.
  • Buchali F.
  • Carbo Meseguer A.
  • Charlet G.
  • Fernandez I.
  • Ghazisaeidi A.
  • Hu Q.
  • Renaudier J.
  • Rios-Muller R.
  • Schmalen L.
  • Tran P.

We review the most recent, advanced concepts and methods employed in the cutting-edge spectrally-efficient coherent fiber-optic transoceanic transmission systems, such as probabilistic shaping, adaptive digital nonlinear compensation, rate-adaptive spatially-coupled low density parity check codes, and dual-band C+L-band transmission. Building upon all these concepts and methods, we demonstrate transmission of 179 ...