Mohamed Chaïbi

Cadi Ayyad University

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Didier Erasme

Laboratoire Traitement et Communication de l’Information

Laurent Bramerie

Fonctions Optiques pour les Technologies de l’information

Christophe Peucheret

Fonctions Optiques pour les Technologies de l’information

A. Mediavilla

Universidad de Cantabria

Abdessamad Charif

Cadi Ayyad University

C. Kazmierski

III V Lab

Christelle Aupetit‐Berthelemot

Université de Limoges

Thomas Anfray

Airbus (France)

Mοhamed Ayt Ougougdal

Cadi Ayyad University

François Sabatier

Aix-Marseille Université

Cooperative Institutions

Centre National de la Recherche Scientifique

International Society for Optics and Photonics

Bellingham Technical College

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

CEA LETI

Télécom Paris

Universidad de Cantabria

Université Grenoble Alpes

Université Paris-Saclay

Fonctions Optiques pour les Technologies de l’information

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Accurate large-signal single current source thermal model for GaAs MESFET/HEMT

Electronics Letters (2007)

Mohamed Chaïbi T. Fernández J. Rodriguez‐Tellez Juan Luis Cano de Diego M. Aghoutane

An accurate approach to the simulation of the DC and pulsed IV characteristics of GaAs MESFETs over the −70 to +70°C temperature range is presented. The new approach, suitably modified, can be applied to existing DC models to increase their accuracy and range of operation.

MESFET

Large-signal model

SIGNAL (programming language)

Atmospheric temperature range

Small-signal model

10.1049/el:20071111

Cite

Citations (6)

Analysis of Coastal Retreat and Slope Movements on Rocky Coastal Cliffs: A Distributed Natural Hazard in the Safi Region, Morocco

Chaima Imam Mohamed Chaïbi Mοhamed Ayt Ougougdal Fatima El Bchari Abdessamad Charif

The coastal area of Safi between Cap Beddouza and Jorf Lihoudi is dominated by different forms of marine cliffs forming the coastline, with rock formations ranging from Jurassic to Quaternary. The main coastal geological risk is the instabilities of these cliffs due to falls and collapses of blocks as well as landslides. The aim of this paper is to give detailed information on the rate of cliff summit recession for the last 66 years, obtained by applying the DSAS model, in parallel with the identification of unstable elements, including their different parameters such as size, abundance, activity in time and their effect on the recession of the cliff top, which are fundamental information for the evolution models of sea cliffs. These phenomena constitute a significant economical, social, and environmental risk.

Cliff

Summit

Rockfall

Natural hazard

10.3390/iecg2022-13962

Cite

Citations (1)

25-Gb/s Transmission Over 2.5-km SSMF by Silicon MRR Enhanced 1.55- $\mu \text{m}$ III-V/SOI DML

IEEE Photonics Technology Letters (2017)

Valentina Cristofori Francesco Da Ros Oskars Ozoliņš Mohamed Chaïbi Laurent Bramerie

The use of a micro-ring resonator (MRR) to enhance the modulation extinction ratio and dispersion tolerance of a directly modulated laser is experimentally investigated with a bit rate of 25 Gb/s as proposed for the next generation data center communications. The investigated system combines a 11-GHz 1.55-

$\mu \text{m}$

directly modulated hybrid III–V/SOI DFB laser realized by bonding III–V materials (InGaAlAs) on a silicon-on-insulator (SOI) wafer and a silicon MRR also fabricated on SOI. Such a transmitter enables error-free transmission (

$\text {BER}<10^{-9}$

) at 25 Gb/s data rate over 2.5-km standard single mode fiber without dispersion compensation nor forward error correction. As both laser and MRR are fabricated on the SOI platform, they could be combined into a single device with enhanced performance, thus providing a cost-effective transmitter for short reach applications.

Extinction ratio

Modulation (music)

10.1109/lpt.2017.2700497

Cite

Citations (6)

1.5-μm Directly modulated transmission over 66 km of SSMF with an integrated hybrid III-V/SOI DFB laser

Valentina Cristofori Francesco Da Ros Mohamed Chaïbi Yunhong Ding Laurent Bramerie

A hybrid III-V/SOI directly modulated DFB laser operating at 1.5 μο is fabricated, showing a side mode suppression ratio above 50 dB and a 3-dB bandwidth of 12 GHz. Error-free transmission (BER<10 ⁻⁹ ) at 10 Gb/s over 66-km SSMF is demonstrated without dispersion compensation and FEC.

10.1109/group4.2017.8082217

Cite

Citations (0)

Demonstration of 16QAM-OFDM UDWDM Transmission Using a Tunable Optical Flat Comb Source

Journal of Lightwave Technology (2016)

Abir Hraghi Mohamed Chaïbi Mourad Menif Didier Erasme

A new approach for designing broad and flattened spectrum multicarriers optical sources is presented leading to a 32 spectral lines source by using a dual-arm Mach-Zehnder modulator (MZM) and a 41 spectral lines source from two-stage MZM. A modified simulated annealing-based optimization method is applied to derive the necessary settings allowing the optical flat comb source (OFCS) to be ultraflat. The OFCS is mooted as a technology to enhance the overall capacity of an access optical network by increasing the number of wavelength division multiplexing (WDM) channels. Here, we demonstrate an ultradense WDM (UDWDM) transmission for application to passive optical networks with (11 × 12.5 Gbps) quadrature amplitude modulation (QAM) based on a 4 b/s/Hz spectral efficiency orthogonal frequency division multiplex (16QAM-OFDM) transmitter and direct detection. We use an OFCS to generate the 11 subcarriers spaced by 6.25 GHz, made of a two-stage MZM. We study the performance of three filtered channels in terms of error vector magnitude in back-to-back (B-to-B) conditions and after propagation through 25 and 100 km standard single mode fiber.

Spectral Efficiency

Channel spacing

QAM

Modulation (music)

10.1109/jlt.2016.2636442

Cite

Citations (24)

Frequency-dependent linewidth enhancement factor of optical injection-locked quantum dot/dash lasers

Optics Express (2015)

Cheng Wang Mohamed Chaïbi Heming Huang Didier Erasme Philip J. Poole

Combining theoretical and experimental studies show that optical injection strongly changes the behavior of the linewidth enhancement factor (α(H)-factor) and the FM-to-AM indices ratio (FAIR) in quantum dash/dot semiconductor lasers. In contrast to solitary lasers, both the α(H)-factor and the FAIR at low-frequency modulation are reduced by optical injection. At high modulation frequency, however, the phase-amplitude coupling characteristics are little influenced by optical injection.

Laser linewidth

Amplified spontaneous emission

10.1364/oe.23.021761

Cite

Citations (10)

SISTEMA DE ALIMENTACIÓN DE ANTENAS CON DUAL POLARIZACIÓN CIRCULAR

Abdelwahed Tribak Karen Cepero Llauger A. Mediavilla Mohamed Boussouis Mohamed Chaïbi

A dual circular polarization feed antenna system for satellite communication is described. It consists of a septum OMT-Polarizer type, and two identical duplexers formed by a plane T-junction and of two iris filters, along with two electric field rotators since the vectors of the electric field in the rectangular ports must be vertical. This 4-port system transmits and receives radio frequency signals in double track in which the transmission Tx is made through two ports having as a access the standard rectangular waveguide WR42 and the reception RX is made also through two ports having as a access the standard rectangular waveguide WR28. To separate the two ways with the circular common port (or rather on the level of the antenna), as well in the transmission as in the reception, we used double circular polarization: right hand circular polarization (RHCP) and left hand circular polarization (LHCP).

Polarizer

Source

Cite

Citations (0)

20-Gbps QPSK Signal Generation Using a Silicon Dual-Drive Mach-Zehnder Modulator Operating in the O-Band

Laurent Bramerie Diego Pérez‐Galacho Charles Baudot Mohamed Chaïbi S. Messaoudène

20-Gbps QPSK modulation in the O-band is experimentally demonstrated using a simple transmitter structure based on a silicon dual-drive Mach-Zehnder modulator. A power penalty of only 1.5 dB was obtained with respect to the same transmitter structure in LiNbO ₃ .

Modulation (music)

Electro-optic modulator

SIGNAL (programming language)

10.1109/ecoc.2017.8346038

Cite

Citations (1)

Characterization of the Electronic Mobility Dependence on Frequency and Bias in AsGa Devices

Mohamed Chaïbi T. Femandez G. Rafael José Ángel García García A. Mediavilla

In this paper, a novel technique to study the evolution of the electronic mobility in GaAs microwave MESFET's devices versus both, frequency and bias condition is presented. The technique employs scattering parameters measurement over the frequency band of interest along with DC and pulsed transconductance and output conductance device measurements. The examination of the presented results shows the need to include the variation of mobility with DC bias and frequency in device nonlinear models

MESFET

Transconductance

Frequency dependence

Biasing

DC bias

10.1109/melcon.2006.1653062

Cite

Citations (0)

Isometry classes of 3 dimensional lens spaces

Bulletin de la Classe des sciences (2002)

Michel Cahen Mohamed Chaïbi

Isometry (Riemannian geometry)

10.3406/barb.2002.28300

Cite

Citations (0)