Generation of new coherent light states using III-V semiconductor laser technology: VORTEX, continuum, dual frequency for THz and integration

  • Beaudoin G.
  • Blin S.
  • Chomet B.
  • Garnache A.
  • Lalanne P.
  • Legratiet L.
  • Myara M.
  • Paquet R.
  • Sagnes I.
  • Seghilani M.
  • Sellahi M.

Since years, III-V semiconductor based external-cavity VCSEL (VECSEL) concept [I] is pointed out as a technology of choice for beyond-state-of-the-art laser light sources, demonstrating wavelength flexibility, high power, high spatial, temporal and polarization coherence, CW or fs ultra-short pulsed operation, compactness and functionalities. The targeted coherent state is typically a ...

Integration of high coherence high power broadly tunable semiconductor lasers for NIR & MIR applications: Single and dual frequency state

  • Beaudoin G.
  • Cerutti L.
  • Chome B.
  • Denet S.
  • Ferrieres L.
  • Garnache A.
  • Lecocq V
  • Myara M.
  • Sagnes I.

Laser technology is finding applications in areas such as high resolution spectroscopy, radar-lidar, velocimetry, and more recently in the THz domain such as imaging or spectroscopy, where highly coherent tunable high power light sources are required. The Vertical External Cavity Surface Emitting Laser (VECSEL) technology [1] has been identified for ...

Energy based transmission optimisation in nonlinear Fourier domain

  • Derevyanko S.
  • Kamalian M.
  • Le S.
  • Prilepsky J.
  • Turitsyn S.

The systems employing nonlinear Fourier transform (NFT) as a method of nonlinearity mitigation have recently become the subject of intensive study (see e.g. [1-4] and references therein). In particular the so-called nonlinear inverse synthesis (NIS) method was proposed in [2]. Within this method the data is modulated using the continuous ...

Equalization-enhanced phase noise suppression advantage of CO-FBMC over RGI CO-OFDM

  • Le S.
  • Megret P.
  • Missel R.
  • Nguyen T.
  • Wuilpart M.

Reduced-guard-interval (RGI) coherent optical orthogonal frequency division multiplexing (CO-OFDM) has been considered as a promising technique for high-speed optical fiber communication systems due to its simple equalization scheme and tolerance to residual chromatic dispersion (CD) [1]. However, one serious drawback of RGI OFDM is the high side lobes due to ...

Self-stabilized optoelectronic oscillator using optical feedback on integrated heterodyne source

  • Alouini M.
  • Primiani P.
  • Romanelli M.
  • Thorette A.
  • Vallet M.
  • Van Dijk F.

Generation of opto-RF signals through heterodyning is now firmly established, the RF frequency being provided by the beat note between two lasers. It offers true single sideband signals, 100% modulation depth and tunability. However, the use of two independent free-running lasers leads to a large RF linewidth that has to ...

Multi-plane light conversion with low plane count

  • Carpenter J.
  • Fontaine N.

Multi-plane light conversion (MPLC) [1], [2] consists of a series of phase masks separated by a Fourier transform or free-space propagation and is illustrated conceptually in Fig. 1(a). Through this cascaded sequence of phase masks, and the diffraction which occurs between the masks, it is possible to implement arbitrary unitary ...

Constant Delivery Delay Protocol Sequences for the Collision Channel Without Feedback

  • Chen C.
  • Salaun L.

We consider the collision channel without feedback, a time-slotted communication channel shared by K users. In this model, packets transmitted in the same time slot collide and are unrecoverable. Each users access the channel according to an internal periodical pattern called protocol sequence. Due to the lack of feedback, users ...

Minimum entropy pursuit: Noise analysis

  • Jalali S.
  • Poor H.

Universal compressed sensing algorithms recover a â??structuredâ?? signal from its under-sampled linear measurements, without knowing its distribution. The recently developed minimum entropy pursuit (MEP) optimization suggests a framework for developing universal compressed sensing algorithms. In the noiseless setting, among all signals that satisfy the measurement constraints, MEP seeks the â??simplestâ??. ...

Efficient large scale antenna selection by partial switching connectivity

  • Garcia-Rodriguez A.
  • Masouros C.
  • Rulikowski P.

In this work we analyze the benefits of low-complexity radio frequency (RF) switching matrices (SMs) for antenna selection (AS) in large scale antenna systems (LSAS). The reduced RF complexity and insertion losses (ILs) are attained by limiting the number of internal connections in the SM, at the expense of a ...

Joint alpha-fairness based DSM and user encoding ordering for zero-forcing nonlinear precoding in G. fast downstream transmission

  • Lanneer W.
  • Maes J.
  • Moonen M.
  • Tsiaflakis P.

In the frequency range with strong levels of crosstalk, nonlinear precoding (NLP) is proposed as a near-optimal technique for crosstalk precompensation in downstream transmission. While existing methods for multi-tone NLP user encoding ordering (UEO) are rather heuristic in how they approach fairness and suffer from substantial suboptimality, we develop ...

Double Relay Communication Protocol with power control for achieving fairness in cellular systems

  • Moonen M.
  • Orozco A.
  • Pollin S.
  • Rosas F.
  • Torrea-Duran R.
  • Tsiaflakis P.
  • Vandendorpe L.

The growing demand for wireless connectivity has turned bandwidth into a scarce resource that has to be carefully managed and fairly distributed to users. However, the variability of the wireless channel can severely degrade the service received by each user. The Double Relay Communication Protocol (DRCP) [1] is a transmission ...

Can Mobile Workforce Revolutionize Country-Scale Crowdsourcing?

  • Acer U.
  • Forlivesi C.
  • Godon M.
  • Kawsar F.
  • Van Den Broeck M.

Traditional urban-scale crowdsourcing approaches suffer from three caveats - lack of complete spatiotemporal coverage, lack of accurate information and lack of sustained engagement of crowd workers. We argue that mobile workforces roaming around the city (and the larger country) can overcome all three caveats if their daily activity routines embed ...

Multi-user Communication in Cloud Radio Access Network: Architecture, Coordination and Optimization

  • Boviz D.

In future mobile networks denser deployment of radio access points is planned to satisfy demand of higher throughput, but an increased number of mobile users can suffer from inter-cell interference. Fortunately, the centralization of base-band processing offered by Cloud Radio Access Network (C-RAN) architecture enables coordination and joint physical layer ...

Making the case for a real-time market of wireless resources with dynamic network slicing and sharing

  • Capone A.
  • Cesana Matteo
  • Malanchini I.
  • Suryaprakash V.

This position paper presents a new approach to infrastructure sharing for mobile networks based on the idea that network resources, both at the wireless access and the core network, can be traded dynamically on a real-time market where virtual operators or tenants compete to obtain the resource to get the ...

Efficient hybrid space-ground precoding techniques for multi-beam satellite systems

  • Haardt M.
  • Song N.
  • Yang T.

Multi-beam mobile satellite systems aim at providing broadband and high speed mobile services over a large area to achieve a high system throughput, where hybrid space-ground beamforming is one of the most promising candidates for ground-based beamforming techniques. It not only reduces the feeder link bandwidth to save spectral resources, ...


  • Cammerer S.
  • Hoydis J.
  • Leible B.
  • Stahl M.
  • Ten Brink S.

The decoding performance of polar codes strongly depends on the decoding algorithm used, while also the decoder throughput and its latency mainly depend on the decoding algorithm. In this work, we implement the powerful successive cancellation list (SCL) decoder on a GPU and identify the bottlenecks of this algorithm with ...

Building Connected Car Applications on Top of the World-Wide Streams Platform

  • Cortes M.
  • Dobbelaere P.
  • Hoste L.
  • Philips E.
  • Roelands M.
  • Sheykh Esmaili K.
  • Trappeniers L.
  • Van Cutsem T.
  • Van Raemdonck W.

The connected car is likely to play a fundamental role in the foreseeable Internet of Things. The connectivity aspect in combination with the available data (e.g. from GPS, on-board diagnostics, road sensors) and video (e.g. from dashcams and traffic cameras) streams enable a range of new applications, e.g., accident avoidance, ...

Tutorial: Reflections on Almost Two Decades of Research into Stream Processing

  • Sheykh Esmaili K.

Ever since the need for new approaches and systems to handle data streams was identified in early 2000s, stream processing has been an active area of research, resulting in a large body of work with significant impact. This tutorial reflects on this research history by highlighting a number of trends ...

Kafka versus RabbitMQ, A comparative study of two industry reference publish/subscribe implementations

  • Dobbelaere P.
  • Sheykh Esmaili K.

Apache Kafka and RabbitMQ are two popular publish/subscribe implementations that can be used when a multitude of data streams need to be connected between a set of producers and a set of con- sumers. They have some functional and non-functional features in common, which encourages software architects to compare them ...


  • Chen S.
  • Grover P.
  • Kar S.
  • Kovacevic J.
  • Maddahali M.
  • Yang Y.

We consider a problem of localizing the destination of an activated path signal supported on a graph. An “activated path signal” is a graph signal that evolves over time that can be viewed as the trajectory of a moving agent. We show that by combining dynamic programming and graph partitioning, ...