74.38 Tb/s Transmission over 6300 km Single Mode Fibre Enabled by C+L Amplification and Geometrically Shaped PDM-64QAM

© 1983-2012 IEEE. Ultrawide-bandwidth optical amplification over almost 90 nm, covering the C+L bands, is described. Complemented by system-tailored geometrical constellation shaping and nonlinearity compensation, it enabled a record capacity transmission of 74.38 Tb/s over 6,300 km of G.654 single-mode fibre. The hybrid scheme, combining backward Raman pre-amplification with EDFA, ...

Efficient initialisation of iterative linear massive MIMO detectors using a stair matrix

© The Institution of Engineering and Technology 2020 Several approximate matrix inversion methods have been used in linear massive MIMO uplink detectors where their convergence rate, performance, and complexity are greatly affected by the initial solution. In this Letter, the authors exploit a stair matrix, instead of a diagonal matrix, ...

A preliminary roadmap for dependability research in fog computing

Fog computing aims to support novel real-time applications by extending cloud resources to the network edge. This technology is highly heterogeneous and comprises a wide variety of devices interconnected through the so-called fog layer. Compared to traditional cloud infrastructure, fog presents more varied reliability challenges, due to its constrained resources ...

An End-to-end Performance Analysis for Service Chaining in a Virtualized Network

Future mobile networks supporting Internet of Things are expected to provide both high throughput and low latency to user-specific services. One way to overcome this challenge is to adopt network function virtualization and Multi-access edge computing (MEC). Besides latency constraints, these services may have strict function chaining requirements. In other ...

Audience Meter: a Use Case of Deploying Machine Learning Algorithms over 5G Networks with MEC

Audience Meter is an application that estimates the number of attendees in an event throughout the time by applying a state-of-the-art face detection algorithm. In order to detect faces at large distances, high resolution images are required. This makes unfeasible the computation of the algorithm on the device and requires ...

Towards Massive MIMO 2.0: Understanding spatial correlation, interference suppression, and pilot contamination

Since the seminal paper by Marzetta from 2010, Massive MIMO has changed from being a theoretical concept with an infinite number of antennas to a practical technology. The key concepts are adopted in 5G and base stations (BSs) with M = 64 full-digital transceivers have been commercially deployed. The fast ...

Static Data-Flow Analysis of UML/SysML Functional Views for Signal and Image Processing Applications

The complexity of heterogeneous Multi-Processor Systems-on-Chip stretches the limits of software development solutions based on sequential languages such as C/C++. While these are still the most widely used languages in practice, model-based solutions appear to be an efficient alternative. However, the optimized compilation of models still presents many open research ...

Recent Advances in 100+nm Ultra-Wideband Fiber-Optic Transmission Systems Using Semiconductor Optical Amplifiers

We report on the use of semiconductor optical amplifiers (SOAs) to extend the optical bandwidth of next generation optical systems to 100 nm and beyond. After discussing the technological progress and the motivation for rekindling the interest in SOAs for line amplification, we describe the innovative approach developed for the ...

Secure cloud computing with a virtualized network infrastructure

© USENIX Workshop on Hot Topics in Cloud Computing, HotCloud 2010.All right reserved. Despite the rapid development in the field of cloud computing, security is still one of the major hurdles to cloud computing adoption. Most cloud services (e.g. Amazon EC2) are offered at low cost without much protection to ...

Ted Geballe and HTSC

© 2019, Springer Science+Business Media, LLC, part of Springer Nature. The most prominent theoretical question for high-temperature superconductors is, ?Why is Tc so much higher in these materials than in conventional metallic superconductors?? My answer is that the dopants (often, but not always, oxygen vacancies or interstitials) have formed self-organized ...

Ultra-High-Speed 2:1 Digital Selector and Plasmonic Modulator IM/DD Transmitter Operating at 222 GBaud for Intra-Datacenter Applications

We demonstrate a 222 GBd on-off-keying transmitter in a short-reach intra-datacenter scenario with direct detection after 120 m of standard single mode fiber. The system operates at net-data rates of >200 Gb/s OOK for transmission distances of a few meters, and >177 Gb/s over 120 m, limited by chromatic dispersion ...

Supply-Power-Constrained Cable Capacity Maximization Using Multi-Layer Neural Networks

We experimentally solve the problem of maximizing capacity under a total supply power constraint in a massively parallel submarine cable context, i.e., for a spatially-uncoupled system in which fiber Kerr nonlinearity is not a dominant limitation. By using multi-layer neural networks trained with extensive measurement data acquired from a 12-span ...

Remote Spatio-Temporal Focusing over Multimode Fiber Enabled by Single-Ended Channel Estimation

Multimode fiber (MMF) is attractive for a variety of applications requiring a large number of spatially overlapped modes including biophotonics and telecommunication. Superimposing these modes at the input by controlling the amplitude and phase of each individual mode can form arbitrarily structured light at the distal end of the MMF, ...

Toward Theoretically Founded Learning-Based Compressed Sensing

© 1963-2012 IEEE. Noiseless compressed sensing refers to the problem of recovering a (high-dimensional) signal from its under-determined linear measurements. For compressed sensing to be feasible, the signal needs to be structured. While the main focus of the field has been on simple structures such as sparsity, there has been ...

Differential drive I/Q modulator based on silicon photonic electro-absorption modulators

We demonstrate up to 100Gbaud quadrature- amplitude modulated(QAM) signal generation with monolithic silicon in-phase quadrature(I/Q)-modulator based on silicon-germanium (SiGe) electro-absorption modulators (EAM). The modulator is in a differentially driven Mach-Zehnder(MZ) interferometric configuration similar to the conventional MZ modulator (MZM) based (I/Q) modulators. In particular, single-polarization quadrature phase-shift keying(SP-QPSK) signaling at ...

Comparison of AlGaInAs-based Laser Behavior Grown on Hybrid InP-SiO2/Si and InP Substrates

In this work, we present the fabrication process of a 3 µm-thick AlGaInAs-based vertical p-i-n laser diode structure grown on a directly bonded InP-SiO2/Si (InPoSi) substrate. High-quality epitaxial growth on InPoSi is reported. Device performance is compared to the ones obtained from the same growth run on an InP substrate ...

Dual Polarization Full-Field Arbitrary Waveform Reconstruction Using Intensity Only Measurements for Coherent Communications

Conventional optical coherent receivers capture the full electrical field, both amplitude and phase, of a signal waveform by measuring its interference against a stable continuous-wave local oscillator (LO). In optical coherent communications, powerful digital signal processing (DSP) techniques that operate on the full electrical field can undo transmission impairments such ...

Building a Truly Dynamic Filterless Metro Network by Reusing a Commercial PON's Data-Plane and a Novel SDN-Enabled Control-Plane

© 1983-2012 IEEE. The migration of DataCenters into Metropolitan Area Networks creates new challenges which include the need for rapid service provisioning and recovery and new, cost-effective, connectivity schemes. Here we propose and demonstrate a truly dynamic transportation platform tailored for a metro network. The novelty of the proposed architecture ...

93-GHz Experiments with Phased Array Antenna in Anechoic Chamber for 5G Evolution and Beyond

This paper presents results of experiments in the 93-GHz band employing a phased-array antenna in an anechoic chamber that verify beam-tracking performance and the effectiveness of a reflector. This is first experiments evaluating 93-GHz throughput performance with a phased-array antenna in an actual environment. To verify beam tracking in the ...

Quantifying the Gain of Dynamic Network Slicing under Critical Constraints

By providing high flexibility and abstraction of network resources and functions, network slicing allows to partition a single physical infrastructure in multiple logical independent networks, called slices. To guarantee the required network performances, slices need to be logically isolated from each other. Therefore, advanced mechanisms are needed to efficiently manage ...