102 results match your criteria Alcatel Telecommunications Review[Journal]

Fatty Acid Monolayers on Randomly Nanostructured Inorganic Surfaces: Interplay of Wettability, Chemistry, and Topography.

Langmuir 2020 Oct 30;36(40):11845-11854. Epub 2020 Sep 30.

Laboratoire de Réactivité de Surface, Sorbonne Université, CNRS, 4 place Jussieu, F-75005, Paris, France.

Understanding the wetting properties of chemically modified inorganic surfaces with random nanoscale topographies is of fundamental importance for diverse applications. This issue has hitherto continuously been the subject of considerable controversies. Herein, we report a thorough investigation of the wettability-topography-chemistry balance for a nanostructured surface with random topography, the main challenge being decoupling topography from surface chemistry. Read More

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October 2020

Scaling photonic lanterns for space-division multiplexing.

Sci Rep 2018 Jun 11;8(1):8897. Epub 2018 Jun 11.

CREOL, The College of Optics & Photonics, the University of Central Florida, Orlando, Florida, 32816-2700, USA.

We present a new technique allowing the fabrication of large modal count photonic lanterns for space-division multiplexing applications. We demonstrate mode-selective photonic lanterns supporting 10 and 15 spatial channels by using graded-index fibres and microstructured templates. These templates are a versatile approach to position the graded-index fibres in the required geometry for efficient mode sampling and conversion. Read More

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Ultrasound versus stethoscope in internal medicine: Do not skip steps.

Eur J Intern Med 2018 04 1;50:e11-e12. Epub 2017 Nov 1.

Member from Alcatel Lucent Academy, Bolsenheim 67150, France.

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Lipid Layers on Nanoscale Surface Topography: Stability and Effect on Protein Adsorption.

Langmuir 2017 05 27;33(18):4414-4425. Epub 2017 Apr 27.

Sorbonne Universités, UPMC Univ Paris 06 , F-75005 Paris, France.

Herein, we report the coating of a surface with a random nanoscale topography with a lipid film formed by an anchoring stearic acid (SA) monolayer and phospholipid (DPPC) layers. For this purpose, different procedures were used for phospholipid coating, including adsorption from solution, drop deposition, and spin-coating. Our results reveal that the morphology of the obtained lipid films is strongly influenced by the topography of the underlying substrate but also impacted by other factors, including the coating procedure and surface wettability (modulated by the presence of SA). Read More

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Linear precoding based on polynomial expansion: reducing complexity in massive MIMO.

EURASIP J Wirel Commun Netw 2016;2016:63. Epub 2016 Feb 29.

Mathematical and Algorithmic Sciences Lab, France Research Center, Huawei Technologies Co. Ltd., Arcs de Seine Bâtiment A, 20 Quai du Point du Jour, Boulogne-Billancourt, 92100 France ; Alcatel-Lucent on Flexible Radio, SUPELEC, Plateau de Moulon, 3 Rue Joliot Curie, Gif-sur-Yvette, 91190 France.

Massive multiple-input multiple-output (MIMO) techniques have the potential to bring tremendous improvements in spectral efficiency to future communication systems. Counterintuitively, the practical issues of having uncertain channel knowledge, high propagation losses, and implementing optimal non-linear precoding are solved more or less automatically by enlarging system dimensions. However, the computational precoding complexity grows with the system dimensions. Read More

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February 2016

Low temperature plasma enhanced CVD epitaxial growth of silicon on GaAs: a new paradigm for III-V/Si integration.

Sci Rep 2016 05 11;6:25674. Epub 2016 May 11.

LPICM-CNRS, Ecole Polytechnique, Université Paris-Saclay, 91128 Palaiseau, France.

The integration of III-V semiconductors with silicon is a key issue for photonics, microelectronics and photovoltaics. With the standard approach, namely the epitaxial growth of III-V on silicon, thick and complex buffer layers are required to limit the crystalline defects caused by the interface polarity issues, the thermal expansion, and lattice mismatches. To overcome these problems, we have developed a reverse and innovative approach to combine III-V and silicon: the straightforward epitaxial growth of silicon on GaAs at low temperature by plasma enhanced CVD (PECVD). Read More

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Stethoscope: A Still-Relevant Tool and Medical Companion.

Am J Med 2016 05;129(5):e37-8

Independent researcher, Member, Alcatel Lucent Academy, Bolsenheim, France.

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Infinite Continuous Feature Model for Psychiatric Comorbidity Analysis.

Neural Comput 2016 Feb 14;28(2):354-81. Epub 2015 Dec 14.

Department of Signal Processing and Communications, University Carlos III in Madrid, 28911 Leganes, Madrid; Gregorio Marañón Health Research Institute, 28007 Madrid, Spain; and Bell Labs, Alcatel-Lucent, New Providence, NJ 07974, U. S. A.

We aim at finding the comorbidity patterns of substance abuse, mood and personality disorders using the diagnoses from the National Epidemiologic Survey on Alcohol and Related Conditions database. To this end, we propose a novel Bayesian nonparametric latent feature model for categorical observations, based on the Indian buffet process, in which the latent variables can take values between 0 and 1. The proposed model has several interesting features for modeling psychiatric disorders. Read More

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February 2016

Phase change dispersion of plasmonic nano-objects.

Sci Rep 2015 Jul 29;5:12665. Epub 2015 Jul 29.

Department of Electrical Engineering, The State University of New York at Buffalo, Buffalo, NY 14260.

Phase is an inherent and important feature for coherent processes, which, unfortunately, has not been completely understood for surface plasmon polariton (SPP) and matter interactions. Here we propose a practical approach to extract the phase change dispersion during the interaction between free-space light, SPPs and nanogroove/slit based on far-field information only. Numerical simulation and experimental validation were both presented using nanoslit-groove plasmonic interferometers, agreeing well with theoretical near-field analysis. Read More

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One-Dimensional Nature of InAs/InP Quantum Dashes Revealed by Scanning Tunneling Spectroscopy.

Nano Lett 2015 Jul 18;15(7):4488-97. Epub 2015 Jun 18.

†CNRS Laboratory for Photonics and Nanostructures, Route de Nozay, 91460 Marcoussis, France.

We report on low-temperature cross-sectional scanning tunneling microscopy and spectroscopy on InAs(P)/InGaAsP/InP(001) quantum dashes, embedded in a diode-laser structure. The laser active region consists of nine InAs(P) quantum dash layers separated by the InGaAsP quaternary alloy barriers. The effect of the p-i-n junction built-in potential on the band structure has been evidenced and quantified on large-scale tunneling spectroscopic measurements across the whole active region. Read More

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The effect of work shift configurations on emergency medical dispatch center response.

Prehosp Emerg Care 2015 Apr-Jun;19(2):254-9. Epub 2014 Oct 8.

Objective: It has been proved that emergency medical dispatch centers (EMDC) save lives by promoting an appropriate allocation of emergency medical service resources. Indeed, optimal dispatcher call duration is pivotal to reduce the time gap between the time a call is placed and the delivery of medical care. However, little is known about the impact of work shift configurations (i. Read More

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How coalescing droplets jump.

ACS Nano 2014 Oct 18;8(10):10352-62. Epub 2014 Sep 18.

Thermal Management Research Group, Efficient Energy Transfer (ηET) Department, Bell Laboratories Ireland, Alcatel-Lucent Ireland Ltd. , Blanchardstown Business & Technology Park, Snugborough Road. Dublin 15, Ireland.

Surface engineering at the nanoscale is a rapidly developing field that promises to impact a range of applications including energy production, water desalination, self-cleaning and anti-icing surfaces, thermal management of electronics, microfluidic platforms, and environmental pollution control. As the area advances, more detailed insights of dynamic wetting interactions on these surfaces are needed. In particular, the coalescence of two or more droplets on ultra-low adhesion surfaces leads to droplet jumping. Read More

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October 2014

RSSI-based smooth localization for indoor environment.

ScientificWorldJournal 2014 29;2014:639142. Epub 2014 Jun 29.

IPPFRD, Alcatel-Lucent Shanghai Bell Co. Ltd., Shanghai 201206, China.

Radio frequency (RF) technique, for its better penetrability over traditional techniques such as infrared or ultrasound, is widely used for indoor localization and tracking. In this paper, three novel measurements, point decision accuracy, path matching error and wrong jumping ratio, are firstly defined to express the localization efficiency. Then, a novel RSSI-based smooth localization (RSL) algorithm is designed, implemented, and evaluated on the WiFi networks. Read More

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960-km SSMF transmission of 105.7-Gb/s PDM 3-PAM using directly modulated VCSELs and coherent detection.

Opt Express 2013 May;21(9):11585-9

Bell Labs, Alcatel Lucent, 791 Holmdel-Keyport Road, Holmdel, NJ 07733, USA.

We generate a 105.7-Gb/s signal by directly modulating a 1.5-µm VCSEL with a 33. Read More

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Schmidt decompositions of parametric processes II: vector four-wave mixing.

Opt Express 2013 May;21(9):11009-20

Bell Laboratories, Alcatel–Lucent, Holmdel, New Jersey 07733, USA.

In vector four-wave mixing, one or two strong pump waves drive two weak signal and idler waves, each of which has two polarization components. In this paper, vector four-wave mixing processes in a randomly-birefringent fiber (modulation interaction, phase conjugation and Bragg scattering) are studied in detail. For each process, the Schmidt decompositions of the coupling matrices facilitate the solution of the signal-idler equations and the Schmidt decomposition of the associated transfer matrix. Read More

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Schmidt decompositions of parametric processes I: basic theory and simple examples.

Opt Express 2013 Jan;21(2):1374-94

Bell Laboratories, Alcatel–Lucent, Holmdel, New Jersey 07733, USA.

Parametric devices based on four-wave mixing in fibers perform many signal-processing functions required by optical communication systems. In these devices, strong pumps drive weak signal and idler sidebands, which can have one or two polarization components, and one or many frequency components. The evolution of these components (modes) is governed by a system of coupled-mode equations. Read More

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January 2013

112-Gb/s monolithic PDM-QPSK modulator in silicon.

Opt Express 2012 Dec;20(26):B624-9

Bell Labs, Alcatel-Lucent, 791 Holmdel Road, Holmdel, New Jersey 07733, USA.

We present a monolithic dual-polarization quadrature phase-shift keying (QPSK) modulator based on a silicon photonic integrated circuit (PIC). This PIC consists of four high-speed silicon modulators, a polarization rotator, and a polarization beam combiner. A 112-Gb/s polarization-division-multiplexed (PDM) QPSK modulation is successfully demonstrated. Read More

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December 2012

Transmission of mixed 260-Gb/s PDM-16QAM and 130-Gb/s PDM-QPSK over 960-km and 4160-km dispersion-managed SSMF spans.

Opt Express 2012 Dec;20(26):B601-7

Bell Labs, Alcatel-Lucent, 791 Holmdel Road, Holmdel, NJ 07733, USA.

We transmit a mix of 260-Gb/s polarization-division-multiplexed 16-ary quadrature-amplitude modulation (PDM-16QAM) and 130-Gb/s polarization-division-multiplexed quadrature-phase-shift-keying (PDM-QPSK) channels at a 50-GHz channel spacing in a dispersion-managed (DM) system with standard single-mode-fiber (SSMF) spans. We study the impact of pulse shaping, time interleaving of polarizations and maximum likelihood (ML) detection techniques on the performance of the system. We show that the pulse shaping and ML detection can increase the transmission distances of the PDM-16QAM channels and PDM-QPSK channels by 50% and 10%, respectively. Read More

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December 2012

Digital coherent superposition for performance improvement of spatially multiplexed coherent optical OFDM superchannels.

Opt Express 2012 Dec;20(26):B595-600

Bell Labs, Alcatel-Lucent, 791 Holmdel-Keyport Road, Holmdel, New Jersey 07733, USA.

We demonstrate the use of digital coherent superposition to improve the performance of space-division-multiplexed (SDM) 676-Gb/s OFDM-16QAM superchannels, achieving ~4 dB improvement in OSNR by using two SDM copies and 1075-km (14 x 76.8 km) transmission over a seven-core-fiber with an effective aggregate spectral efficiency of 23.7 b/s/Hz. Read More

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December 2012

Directly modulated and fully tunable hybrid silicon lasers for future generation of coherent colorless ONU.

Opt Express 2012 Dec;20(26):B552-7

Alcatel-Lucent Bell Labs, Route de Villejust, 91620 Nozay, France.

We propose and demonstrate asymmetric 10 Gbit/s upstream--100 Gbit/s downstream per wavelength colorless WDM/TDM PON using a novel hybrid-silicon chip integrating two tunable lasers. The first laser is directly modulated in burst mode for upstream transmission over up to 25 km of standard single mode fiber and error free transmission over 4 channels across the C-band is demonstrated. The second tunable laser is successfully used as local oscillator in a coherent receiver across the C-band simultaneously operating with the presence of 80 downstream co-channels. Read More

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December 2012

Geometric requirements for photonic lanterns in space division multiplexing.

Opt Express 2012 Nov;20(24):27123-32

Bell Laboratories, Alcatel-Lucent, Holmdel, NJ 07733, USA.

We investigate the use of "photonic lanterns" as adiabatic mode converters for space-division multiplexing (SDM) systems to interface multiple single-mode fibers to a multi-mode fiber. In a SDM system, minimizing the coupling loss and mode-dependent loss best utilizes all spatial modes of the fiber which increases the capacity, the transmission distance, and minimizes the outage probability. We use modal analysis, the beam propagation method, and a transfer matrix technique to analyze the lanterns throughput along with its mode dependent loss and show that unitary coupling between single-mode fibers and a multi-mode fiber is only possible by optimizing the arrangements of the cores. Read More

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November 2012

Scrambled coherent superposition for enhanced optical fiber communication in the nonlinear transmission regime.

Opt Express 2012 Aug;20(17):19088-95

Bell Labs, Alcatel-Lucent, Holmdel, New Jersey 07733, USA.

Coherent superposition of light waves has long been used in various fields of science, and recent advances in digital coherent detection and space-division multiplexing have enabled the coherent superposition of information-carrying optical signals to achieve better communication fidelity on amplified-spontaneous-noise limited communication links. However, fiber nonlinearity introduces highly correlated distortions on identical signals and diminishes the benefit of coherent superposition in nonlinear transmission regime. Here we experimentally demonstrate that through coordinated scrambling of signal constellations at the transmitter, together with appropriate unscrambling at the receiver, the full benefit of coherent superposition is retained in the nonlinear transmission regime of a space-diversity fiber link based on an innovatively engineered multi-core fiber. Read More

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Compact, low-loss and low-power 8×8 broadband silicon optical switch.

Opt Express 2012 Aug;20(17):18977-85

Alcatel-Lucent Bell Laboratories, Holmdel, New Jersey 07733, USA.

We demonstrated a 8×8 broadband optical switch on silicon for transverse-electrical polarization using a switch-and-selector architecture. The switch has a footprint of only 8 mm × 8 mm, minimum on-chip loss of about 4 dB, and a port-to-port insertion loss variation of only 0.8 dB near some spectral regions. Read More

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50-Gb/s silicon quadrature phase-shift keying modulator.

Opt Express 2012 Sep;20(19):21181-6

Bell Labs, Alcatel-Lucent, 791 Holmdel Road, Holmdel, NJ 07733, USA.

We report the first successful demonstration of quadrature phase-shift keying (QPSK) modulation using two nested silicon Mach-Zehnder modulators. 50-Gb/s QPSK signal is generated with only 2.7-dB optical signal-to-noise ratio penalties from the theoretical limit at a bit-error ratio of 10(-3). Read More

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September 2012

Experimental demonstration of microring quadrature phase-shift keying modulators.

Opt Lett 2012 Apr;37(7):1178-80

Bell Labs, Alcatel-Lucent, Holmdel, New Jersey 07733, USA.

Advanced optical modulation formats are a key technology to increase the capacity of optical communication networks. Mach-Zehnder modulators are typically used to generate various modulation formats. Here, we report the first experimental demonstration of quadrature phase-shift keying (QPSK) modulation using compact microring modulators. Read More

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Analysis of soft-decision FEC on non-AWGN channels.

Opt Express 2012 Mar;20(7):7915-28

Bell Labs, Alcatel-Lucent, 1649 Sangam-Dong, Mapo-Gu, Seoul 121-904, South Korea.

Soft-decision forward error correction (SD-FEC) schemes are typically designed for additive white Gaussian noise (AWGN) channels. In a fiber-optic communication system, noise may be neither circularly symmetric nor Gaussian, thus violating an important assumption underlying SD-FEC design. This paper quantifies the impact of non-AWGN noise on SD-FEC performance for such optical channels. Read More

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Simultaneous frequency conversion, regeneration and reshaping of optical signals.

Opt Express 2012 Mar;20(7):6881-6

Bell Laboratories, Alcatel–Lucent, Holmdel, New Jersey 07733, USA.

Nondegenerate four-wave mixing in fibers enables the tunable and low-noise frequency conversion of optical signals. This paper shows that four-wave mixing driven by pulsed pumps can also regenerate and reshape optical signal pulses arbitrarily. Read More

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High-speed low-voltage single-drive push-pull silicon Mach-Zehnder modulators.

Opt Express 2012 Mar;20(6):6163-9

Bell Labs, Alcatel-Lucent, 791 Holmdel Road, Holmdel, NJ 07733, USA.

We demonstrate a single-drive push-pull silicon Mach-Zehnder modulator (MZM) with a π-phase-shift voltage of 3.1 V and speed up to 30 Gb/s. The on-chip insertion loss is 9 dB due to the use of a 6 mm-long phase shifter. Read More

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Visual challenges using Visual Display Units (VDU) in office landscapes.

Work 2012 ;41 Suppl 1:3575-6

Department of Optometry and visual science, Buskerud University College PO Box 235, N-3601 Kongsberg, Norway.

A total of 85 VDU operators, in three main Scandinavian Alcatel-Lucent headquarters, were followed in a process moving from single occupancy offices to an office landscape. This paper discusses the visual challenges and implications in such a transfer. In the oral presentation recommendation on how to avoid visual problems will be given. Read More

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February 2014

Colorless coherent receiver using 3x3 coupler hybrids and single-ended detection.

Opt Express 2012 Jan;20(2):1164-71

Bell Labs, Alcatel-Lucent, Holmdel, NJ 07733, USA.

We demonstrate a single-ended colorless coherent receiver using symmetric 3x3 couplers for optical hybrids. We show that the receiver can achieve colorless reception of fifty-five 112-Gb/s polarization-division-multiplexed quadrature-phase-shift-keyed (PDM-QPSK) channels with less than 1-dB penalty in the back-to-back operation. The receiver also works well in a long-haul wavelength-division-multiplexed (WDM) transmission system over 2560-km TrueWave® REACH fiber. Read More

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January 2012