INVESTIGATION ON WDM NONLINEAR IMPAIRMENTS ARISING FROM THE INSERTION OF 100-GB/S COHERENT PDM-QPSK OVER LEGACY OPTICAL NETWORKS

  • Bertolini M.
  • Bertran Pardo O.
  • Bigo S.
  • Charlet G.
  • Mardoyan H.
  • Renaudier J.
  • Salsi M.
  • Tran P.

In the perspective of smooth capacity upgrades of legacy systems, we experimentally investigate the performance of one 100-Gb/s coherent polarization-division-multiplexed quaternary-phase-shift-keying (PDM-QPSK) channel inserted in a 10-Gb/s ultra-long-haul (ULH) wavelength-division-multiplexing system relying on nonzero dispersion-shifted fibers. The impact of copropagating 10-Gb/s nonreturn-to-zero (NRZ) channels operating ULH distances onto the operational ...

PERFORMANCE OF CACHING ALGORITHMS FOR IPTV ON-DEMAND SERVICES

  • De Vleeschauwer D.
  • Laevens K.

Due to its native return channel and its ability to easily address each user individually an IPTV system is very well suited to offer on-demand services. Those services are becoming more popular as there is an undeniable trend that users want to watch the offered content when and where it ...

HIGH MODULATION EFFICIENCY AND HIGH POWER 1060 NM TAPERED LASERS WITH SEPARATE CONTACTS

  • Krakowski M.
  • Lecomte M.
  • Parillaud O.

A high direct optical modulation amplitude of more than 1.6 W, modulation efficiencies of 20 W/A at 700 Mbit/s and 50 W/A for quasi-static modulation, and a very high optical extinction ratio of 19 dB have been demonstrated in custom-designed gain guided tapered lasers emitting at 1060 nm. The devices ...

HIGH DATA RATE RELAY TRANSMISSIONS WITH MULTIPLE ANTENNAS

  • Alexiou A.
  • Boccardi F.
  • Kai Y

Herein, we present a novel approach for decode-forward relay transmissions using multiple antennas. In this approach, multiple independent spatial data streams are sent to the destination directly and/or through different relays simultaneously, where the relays are selected in an opportunistic way. We show the efficiency of the proposed approach through ...

STATISTICAL MULTIPLEXING OF VIDEO PROGRAMS

  • Changuel N.
  • Sayadi B.

In this work, we propose new R-D models for the SM system using H.264/AVC video encoders. These models take into account the interframe dependencies used for performing motion compensation between a reference and a predicted frame, even I and P frames or P and P frames. In this article, the ...

TRENDS COLUMN: GETTING TO A SEGMENT OF ONE

  • De Fransisco Lopez J

Emerging trends are driving the industry toward "segment of one" marketing rather than relying on traditional market approaches.

NETWORK COORDINATED BEAMFORMING FOR CELL-BOUNDARY USERS: LINEAR AND NONLINEAR APPROACHES

  • Chan-Byoung C
  • Heath R.W
  • Sang-Hyun K

In this paper, low-complexity linear and nonlinear network coordinated beamforming (N-CBF) algorithms are proposed for the multi-cell downlink channel. We consider a downlink scenario with three base stations (BSs) equipped with one transmit antenna each and three mobile users, each of which has more than one receive antenna and is ...

IMPROVING SPATIAL REUSE IN MULTIHOP WIRELESS NETWORKS - A SURVEY

  • Alawieh B.
  • Assi C.
  • Mouftah H.
  • Yongning Z

In multihop wireless ad-hoc networks, the medium access control (MAC) protocol plays a key role in coordinating the access to the shared medium among wireless nodes. Currently, the distributed coordination function (DCF) of the IEEE 802.11 is the dominant MAC protocol for both wireless LANs and wireless multihop ad hoc ...

A 1-GSAMPLE/S, 15-GHZ INPUT BANDWIDTH MASTER–SLAVE TRACK-AND-HOLD AMPLIFIER IN INP DHBT TECHNOLOGY

  • Bouvier Y.
  • Godin J.
  • Konczykowska A.
  • Ouslimani A.

A fully differential master-slave track-and-hold amplifier is designed and fabricated in a 210-GHz-f T InP DHBT process. Input bandwidth of 15 GHz, total harmonic distortion lower than -39 dB and a third harmonic rejection greater than 45 dB are measured for 1 GSample/s and 4 dBm single-ended input signal. Time ...

SUM DISCRETE-RATE MAXIMIZATION WITH RATE AND POWER CONTROL IN LAYERED SPACE-TIME CODING

  • Berthet A-O
  • Layec P
  • Visoz R.

This paper generalizes the information-theoretic optimality of minimum mean square error successive interference cancellation in layered space-time coding with rate and power control. Based on this derivation, a new concept relying on partial feedback is introduced, whose core idea is to exploit an additional degree of freedom relative to the ...

MANAGING OPEX WHILE DELIVERING 1000S OF APPS

  • Mayer J.
  • Mills C.A

Rampant demand for new services and applications and the emergence of non-traditional competitors are driving CSPs to revisit their business strategies.

SEPARATE ERROR-FREE TRANSMISSION OF EIGHT CHANNELS AT 10 GB/S USING COMB GENERATION IN A QUANTUM-DASH-BASED MODE-LOCKED LASER

  • Akrout A.
  • Brenot R.
  • Guang Hua D
  • Le Gouezigou O.
  • Lelarge F.
  • Pommereau F.
  • Ramdane A.
  • Shen A.
  • Van Dijk F.

We report on comb generation at 1.55 mum using a mode-locked quantum-dash-based laser. A flat optical spectrum with a ~10-nm width consisting of eight 100-GHz-spaced channels is demonstrated. Separate error-free transmission of each channel is achieved at 10 Gb/s over 50-km-long single-mode fiber. Compared to an ideal external cavity continuous-wave ...

STUDY OF THE NOISE-REDUCTION PROBLEM IN THE KARHUNEN–LOÈVE EXPANSION DOMAIN

  • Benesty J.
  • Jingdong C
  • Yiteng H

Noise reduction, which aims at estimating a clean speech from a noisy observation, has long been an active research area. The standard approach to this problem is to obtain the clean speech estimate by linearly filtering the noisy signal. The core issue, then, becomes how to design an optimal linear ...

AN OVERVIEW OF IPTV STANDARDS DEVELOPMENT

  • Maisonneuve J.

In the last few years, IPTV has emerged as one of the major distribution and access techniques for broadband multimedia services. It is one of the primary growth areas for the telecommunications industry. However, existing IPTV systems are generally based on proprietary implementations that do not provide interoperability. Recently, many ...

WAVELENGTH CONVERSION USING SEMICONDUCTOR OPTICAL AMPLIFIERS IN DIFFERENTIAL MACH-ZEHNDER INTERFEROMETER WITH TUNABLE INPUT COUPLER

  • Bernasconi P.
  • Bhardwaj A.
  • Buhl L.
  • Legrange J.
  • Neilson D.
  • Sauer N.
  • Simsarian J.
  • Zhang L.

A monolithically-integrated wavelength converter on an InP platform with a semiconductor optical amplifier in each arm of a differential Mach-Zehnder interferometer is presented. The data input has a tunable coupler that adjusts the splitting ratio of the optical power sent to each arm. Wavelength conversion at 40 Gbit/s is demonstrated ...

HYBRID OPTICAL VECTOR MODULATOR UTILISING ALGAINAS REFLECTIVE EAMS AND HIGH INDEX-CONTRAST SILICA CIRCUIT

  • Alexandre F.
  • Buhl L.
  • Cappuzzo M.
  • Chandrasekhar S.
  • Chen Y.
  • Decobert J.
  • Dupuis N.
  • Earnshaw M.
  • Garreau A.
  • Gomez L.
  • Jany C.
  • Kazmierski C.
  • Landreau J.
  • Lee J.
  • Rasras M.

A new compact photonic-integrated modulator utilising a four-element reflective electro-absorption modulator-semiconductor optical amplifier (EAM-SOA) array and silica interferometric guide arrangement is presented. The EAM-SOA active layer consists of AlGaInAs quantum wells designed in selective area growth technology, which enables an insertion gain, and the mature silica platform provides reduced optical ...

IMPROVED OFDMA UPLINK TRANSMISSION VIA COOPERATIVE RELAYING IN THE PRESENCE OF FREQUENCY OFFSETS—PART II: OUTAGE INFORMATION RATE ANALYSIS

  • Zhongshan Z

n Part I of this paper, the ergodic information rate is derived for an orthogonal frequency-division multiplexing access (OFDMA) uplink with cooperative relaying in the presence of frequency offsets. In this part, the outage information rate of the system is analysed. Both amplify-and-forward (AF) and decode-and-forward (DF) relays are considered. ...

IMPROVED OFDMA UPLINK TRANSMISSION VIA COOPERATIVE RELAYING IN THE PRESENCE OF FREQUENCY OFFSETS—PART I: ERGODIC INFORMATION RATE ANALYSIS

  • Zhongshan Z

In this two-part paper, we evaluate ergodic and outage information rates in an orthogonal frequency-division multiple access (OFDMA) uplink with amplify-and-forward (AF) and decode-and-forward (DF) relays in the presence of frequency offsets. Each node plays the roles of the source node and the relay, simultaneously, but on different subcarriers. In ...

LP MOCVD GROWTH OF INALN/GAN HEMT HETEROSTRUCTURE: COMPARISON OF SAPPHIRE, BULK SIC AND COMPOSITE SICOPSIC SUBSTRATES FOR HEMT DEVICE APPLICATIONS

  • Chartier E.
  • Delage S.
  • Di Forte Poisson M.
  • Di Persio J.
  • Magis M.
  • Morvan E.
  • Oualli M.
  • Sarazin N.
  • Tordjman M.

In this paper we report on low-pressure metalorganic vapour deposition of InAlN/GaN heterostructures grown on different substrates (Sapphire, bulk SiC, composite SiCopSiC) for HEMT applications, and on first device performances obtained with these heterostructures. Optimisation of the crystal growth on each kind of substrate has led to InAlN/GaN HEMT heterostructures ...

THE STRUCTURE OF INALN/GAN HETEROSTRUCTURES FOR HIGH ELECTRON MOBILITY TRANSISTORS

  • Bejerano Y.

In the investigated InAlN/GaN layers, it is shown that the surface morphology and the crystallinity of the alloy critically depend on the In composition. Atomic force microscopy analysis points out that step flow growth is not easily attained in this system. When the InAlN or AlN interlayer thickness is increased, ...