January 01, 2017

Trans-Atlantic Field Trial Using High Spectral Efficiency Probabilistically Shaped 64-QAM and Single-Carrier Real-Time 250-Gb/s 16-QAM

  • Adamiecki A.
  • Burrows E.
  • Chen X.
  • Cho J.
  • Correa D.
  • Corteselli S.
  • Dar R.
  • Grubb S.
  • Mckay B.
  • Pan Y.
  • Raybon G.
  • Schmalen L.
  • Sethumadhavan C.
  • Winzer P.
  • Zsigmond S.

We report the transmission of probabilistically shaped (PS) 64-ary quadrature amplitude modulation (QAM) at 7.46 b/s/Hz over a 5,523-km in-service trans-Atlantic fiber-optic cable that consists of 65 89-km spans of EDFA-only amplified fiber. Using a looped-back system configuration, we achieve 5.68 b/s/Hz over a trans-Pacific-equivalent distance of 11,046 km. Net spectral efficiencies are increased by 18% and 80% by using PS, at 5,523 km and 11,046 km, respectively, compared to uniform square QAM. Throughout our experiments, we pay particular attention that our claims are backed by actually implementable forward error correction schemes. In addition, we demonstrate real-time coherent transmission of single-carrier 200-Gb/s and 250-Gb/s uniform 8-QAM and 16-QAM at 4 b/s/Hz over the 5,523-km cable.

View Original Article

Recent Publications

January 01, 2018

Fair Dynamic Spectrum Management for QRD-Based Precoding with User Encoding Ordering in Downstream G.fast Transmission

In next generation DSL networks such as G.fast, employing discrete multi-tone transmission in high frequencies up to 212 MHz, the crosstalk among lines reaches very high levels. To precompensate the crosstalk in downstream transmission, QRD-based precoding has been proposed as a near-optimal dynamic spectrum management (DSM) technique. However, the performance ...

January 01, 2018

Practical Mitigation of Passive Intermodulation in Microstrip Circuits

This paper presents new experimental evidence and a novel practical approach for mitigation of passive intermodulation (PIM) in microstrip circuits fabricated on commercial printed circuit board laminates. The mechanisms of distributed PIM in microstrip circuits are reviewed and a phenomenology of PIM generation due to locally enhanced electromagnetic fields at ...

January 01, 2018

Efficient Cooperative HARQ for Multi-Source Multi-Relay Wireless Networks

In this paper, we compare the performance of three different cooperative Hybrid Automatic Repeat reQuest (HARQ) protocols for slow-fading half-duplex orthogonal multiple access multiple relay channel. Channel State Information (CSI) is available at the receiving side of each link only. Time Division Multiplexing is assumed, where each orthogonal transmission occurs ...