Quater-Imaginary for Complex Arithmetic Circuits

  • Gomony M.
  • Sarkar S.

Arithmetic operations involving complex numbers are widely used in the signal processing functions of the physical layer of modern wireless and wireline communication systems, electronic instrumentation and control systems. With the ever increasing throughput requirements of the communication standards, the power consumption of the hardware realization is going beyond the ...

Non-linear precoding based hybrid space-ground beamforming for multi-beam satellite systems

  • Haardt M.
  • Song N.
  • Yang T.

Multi-beam mobile satellite systems have a great potential in providing broadband mobile services over a large area to achieve a high system throughput. On ground beamforming techniques are quite promising but require a large feeder link bandwidth to deliver all the feeds’ signals. There are two potential solutions to solve ...

Benefit of progressive deployment of regenerators along with traffic growth in WDM elastic networks

  • Morea A.
  • Pesic J.
  • Zami T.

We present a new strategy of regenerator placement along with traffic growth in the elastic WDM networks, by introducing additional regenerators on the already allocated connections only from when needed to accommodate extra demand of capacity

MIMO Equalization for High-Speed Communication Under Channel Variability

  • Dries Vande Ginste
  • Guenach M.
  • Jelle Bailleul
  • Lennert Jacobs
  • Marc M.
  • Paolo Manfredi

High-speed communication over mutually coupled channels can be severely affected by intersymbol interference (ISI) and crosstalk (XT). Multiple-input multiple-output (MIMO) equalization is known to mitigate both ISI and XT, but requires accurate channel information at the receiver (RX) and/or transmitter (TX) when the channel is stochastic. However, since adjusting the ...

Record-High 17.3-bit/s/Hz Spectral Efficiency Transmission over 50 km Using Probabilistically Shaped PDM 4096-QAM

  • Burrows E.
  • Chen X.
  • Cho J.
  • Olsson S.
  • Sethumadhavan C.
  • Winzer P.

We demonstrate transmission of a 10-subcarrier superchannel with a record-high intra-channel spectral efficiency of 17.3 bit/s/Hz over 50-km backward Raman amplified Corning Vascade EX2000 fiber using 3-GBd probabilistically shaped PDM 4096-QAM.

Scalable Mode sorter supporting 210 Hermite-Gaussian modes

  • Carpenter J.
  • Chen H.
  • Fontaine N.
  • Kim K.
  • Neilson D.
  • Ryf R.

We demonstrate a multi-plane light conversion device based on 7 planes which maps Hermite-Gaussian spatial modes with indices (m,n) onto a Cartesian grid (x,y) of diffraction limited spots for 210 spatial modes.

First Demonstration of an Ultra-Low-Latency Fronthaul Transport Over a Commercial TDM-PON Platform

  • Bidkar S.
  • Galaro J.
  • Pfeiffer T.

We demonstrate for the first time, feasibility of latency-critical mobile fronthaul (CPRI) transport over a 6 km PON infrastructure with co-existing residential broadband traffic using a standards-compliant commercial TDM-PON platform with a sub-200 µs round trip delay.

Fiber type dependent benefits when deploying up-to-300Gb/s elastic transponders adapting to ageing of margins

  • Pesic J.
  • Rossi N.
  • Zami T.

We compare cost savings when planning a WDM French backbone network based on SSMF or LEAF, with 32 GBaud elastic optical transponders adapting their capacity from 100 Gb/s to 300 Gb/s to the actual ageing margins.

1.6Tbps WDM Direct Detection Transmission with Virtual-Carrier over 1200km

  • Buchali F.
  • Buelow H.
  • Schuh K.
  • Thai Le S.

We demonstrate 1.6Tbps 8-channel WDM direct detection transmission with virtual carriers over a record distance of 1200km with Corning TXF fiber by using either Kramers-Kronig receiver or a low complexity interference cancellation scheme.

Probabilistic Constellation Shaping: Challenges and Opportunities for Forward Error Correction

  • Schmalen L.

We discuss the impact of probabilistic amplitude shaping on the forward error correction stage in future optical transceivers and highlight some potential pitfills, as well as challenges and opportunities for future research that may arise.

Influence of the maturity of technology on the benefit of 75 GHz-spaced 64 GBaud channels in WDM elastic networks

  • Bertolini M.
  • Lavigne B.
  • Zami T.

We quantify how the benefit of 75 GHz-spaced 64 GBaud channels in WDM core transparent networks depends on the associated elastic modulation set and on the maturity of transponder implementation, that impact WDM transmission reaches

100 Gbps b-modulated Nonlinear Frequency Division Multiplexed Transmission

We demonstrate that the performance of 100 Gb/s NFDM system employing the continuous nonlinear spectrum is significantly enhanced by modulating only the b-coefficient, providing a gain up to 1.5 dB over the conventional OFDM system.

Mode-Multiplexed 16-QAM Transmission over 2400-km Large-Effective-Area Depressed-Cladding 3-Mode Fiber

We demonstrate 2400 km mode-multiplexed 16-QAM transmission over a low DMGD (27.1 ps/km) and low MDL (1.75 dB) 3-mode fiber link. The large effective-area 3-mode fiber is shown to outperform a standard single-mode fiber for distances up to 4500km.

Flexible Transmission Enabled by Novel M2-QAM Formats with Record Distance - Spectral Efficiency Tuneability

We propose a variable M2-QAM format and coding scheme and demonstrate record distance â€" spectral efficiency tuneability by 6.4 bit/s/Hz and Î"L≈18x, respectively, at 400 and 600 Gb/s per carrier and report record terrestrial reach for high spectral efficient up to 256QAM.

Mode Selective Photonic Lantern with Graded Index Core

We demonstrate a mode selective photonic lantern with a graded index core, which modes are a better match when splicing to graded index transmission fiber compare to those from a photonic lantern with step index core.

Reception of Burst Mode High-Order QAM Signals with Pilot-Aided Digital Signal Processing

We present pilot-assisted burst mode DSP design for high-order QAM signals. Short preambles are used for frame, frequency synchronization and channel estimation. The proposed scheme is experimentally demonstrated to detect 16G-baud PDM 128/256/512-QAM bursts.

93.34 Tbit/s/mode (280 Tbit/s) Transmission in a 3-Mode Graded-Index Few-Mode Fiber

We transmit 381×24.5 Gbaud PDM-64-QAM modulated channels per mode of a 30 km graded-index three-mode fiber, resulting in a record per-mode data-rate of 93.34 TBit/s and an aggregated net-data-rate of 280 Tbit/s.

10Gb/s Low-Cost Directly Modulated Multi-Electrode Laser with Suppressed Thermal Wavelength Drift for Burst-Mode Upstream Transmission in TWDM-PONs

We report on a novel 10Gb/s low-cost multi-electrode DML employed as a very wavelength stable burst-mode source for upstream TWDM-PONs. 10X wavelength drift reduction is achieved compared to conventional DMLs enabling transmission on 100GHz grid.

Burst-Mode Actively-Filtered Receiver for TDM-PON Enabling Extended Reach and Improved Sensitivity

We experimentally demonstrate an actively-filtered receiver for TDM-PON. Bias-current tuning of a DFB-based-filter enables tracking the wavelength-drift of DML under burst-mode operation. We measure >70% reach increase, >5dB sensitivity improvement, and 4.8dB higher extinction ratio.

Convolutional Neural Network based Nonlinear Classifier for 112-Gbps High Speed Optical Link

We have designed a novel convolutional neural network based nonlinear classifier that outperforms traditional Volterra nonlinear equalizers. A BER of 3.50 × 10-6 is obtained for a 112-Gbps PAM4 EML-based optical link over 40-km SMF transmission.