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

View Original Article

Recent Publications

August 09, 2017

A Cloud Native Approach to 5G Network Slicing

  • Francini A.
  • Miller R.
  • Sharma S.

5G networks will have to support a set of very diverse and often extreme requirements. Network slicing offers an effective way to unlock the full potential of 5G networks and meet those requirements on a shared network infrastructure. This paper presents a cloud native approach to network slicing. The cloud ...

August 01, 2017

Modeling and simulation of RSOA with a dual-electrode configuration

  • De Valicourt G.
  • Liu Z.
  • Violas M.
  • Wang H.
  • Wu Q.

Based on the physical model of a bulk reflective semiconductor optical amplifier (RSOA) used as a modulator in radio over fiber (RoF) links, the distributions of carrier density, signal photon density, and amplified spontaneous emission photon density are demonstrated. One of limits in the use of RSOA is the lower ...

July 12, 2017

PrivApprox: Privacy-Preserving Stream Analytics

  • Chen R.
  • Christof Fetzer
  • Le D.
  • Martin Beck
  • Pramod Bhatotia
  • Thorsten Strufe

How to preserve users' privacy while supporting high-utility analytics for low-latency stream processing? To answer this question: we describe the design, implementation and evaluation of PRIVAPPROX, a data analytics system for privacy-preserving stream processing. PRIVAPPROX provides three properties: (i) Privacy: zero-knowledge privacy (ezk) guarantees for users, a privacy bound tighter ...