Personne : Messaddeq, Younès
En cours de chargement...
Date de naissance
Projets de recherche
Nom de famille
Université Laval. Département de physique, de génie physique et d'optique
Résultats de recherche
Voici les éléments 1 - 10 sur 21
- PublicationAccès libreWearable contactless respiration sensor based on multi-material fibers integrated into textile(Molecular Diversity Preservation International (MDPI), 2017-05-06) Gorgutsa, Stepan; LaRochelle, Sophie; Messaddeq, Younès; Guay, PhilippeIn this paper, we report on a novel sensor for the contactless monitoring of the respiration rate, made from multi-material fibers arranged in the form of spiral antenna (2.45 GHz central frequency). High flexibility of the used composite metal-glass-polymer fibers permits their integration into a cotton t-shirt without compromising comfort or restricting movement of the user. At the same time, change of the antenna geometry, due to the chest expansion and the displacement of the air volume in the lungs, is found to cause a significant shift of the antenna operational frequency, thus allowing respiration detection. In contrast with many current solutions, respiration is detected without attachment of the electrodes of any kind to the user’s body, neither direct contact of the fiber with the skin is required. Respiration patterns for two male volunteers were recorded with the help of a sensor prototype integrated into standard cotton t-shirt in sitting, standing, and lying scenarios. The typical measured frequency shift for the deep and shallow breathing was found to be in the range 120–200 MHz and 10–15 MHz, respectively. The same spiral fiber antenna is also shown to be suitable for short-range wireless communication, thus allowing respiration data transmission, for example, via the Bluetooth protocol, to mobile handheld devices.
- PublicationAccès libreUniversal micro-trench resonators for monolithic integration with silicon waveguides(OSA Optical Materials Express, 2021-08-02) Jean, Philippe; Bah, Souleymane Toubou; LaRochelle, Sophie; Shi, Wei; Messaddeq, Younès; Douaud, AlexandreWe present a systematic study of micro-trench resonators for heterogeneous integration with silicon waveguides. We experimentally and numerically demonstrate that the approach is compatible with a large variety of thin film materials and that it does not require specific etching recipe development, thus making it virtually universal. The microresonators are fabricated through in-foundry silicon-on-insulator processing and in-house backend processing. We also report ultra-compact chalcogenide microresonators with radius as small as 5µ and quality factors up to 1.8 × 105. We finally show a proof-of-concept of a novel multilayer waveguide using the micro-trench technique.
- PublicationAccès libreTunable distributed sensing performance in Ca-based nanoparticle-doped optical fibers(OSA Pub., 2022-03-04) Gagnon, Stéphane; Grégoire, Nicolas; Morency, Steeve; Ledemi, Yannick; Fuertes, Victor; LaRochelle, Sophie; Messaddeq, YounèsRayleigh scattering enhanced nanoparticle-doped optical fibers is a technology very promising for distributed sensing applications, however, it remains largely unexplored. This work demonstrates for the first time the possibility of tuning Rayleigh scattering and optical losses in Ca-based nanoparticle-doped silica optical fibers by controlling the kinetics of the re-nucleation process that nanoparticles undergo during fiber drawing by controlling preform feed, drawing speed and temperature. A 3D study by SEM, FIB-SEM and optical backscatter reflectometry (OBR) reveals an early-time kinetics at 1870 °C, with tunable Rayleigh scattering enhancement 43.2–47.4 dB, regarding a long-haul single mode fiber, SMF-28, and associated sensing lengths of 3–5.5 m. At 2065 °C, kinetics is slower and nanoparticle dissolution is favored. Consequently, enhanced scattering values of 24.9–26.9 dB/m and sensing lengths of 135–250 m are attained. Finally, thermal stability above 500 °C and tunable distributed temperature sensitivity are proved, from 18.6 pm/°C to 23.9 pm/°C, ∼1.9–2.4 times larger than in a SMF-28. These results show the promising future of Rayleigh scattering enhanced nanoparticle-doped optical fibers for distributed sensing.
- PublicationAccès libreEtchless chalcogenide microresonators monolithically coupled to silicon photonic waveguides(Optical Society of America, 2020-05-13) Messaddeq, Sandra Helena; Genest, Jérôme; Jean, Philippe; LaRochelle, Sophie; Shi, Wei; Messaddeq, Younès; Douaud, Alexandre; Michaud-Belleau, VincentIntegration of chalcogenide waveguides in silicon photonics can mitigate the prohibitive nonlinear losses ofsilicon while leveraging the mature CMOS-compatiblenanophotonic fabrication process. In this work, wedemonstrate, for the first time, a method of integratinghigh-Q chalcogenides microring resonators onto the sil-icon photonics platform without post-process etching.The method uses micro-trench filling and a novel ther-mal dewetting technique to form low-loss chalcogenidestrip waveguides. The microrings are integrated di-rectly inside silicon photonic circuits through evanes-cent coupling, providing an uncomplicated hybrid in-tegration scheme without the need to modify the exist-ing photonics foundry process. The microrings showa high quality factor exceeding 6⇥105near 1550 nmand propagation losses below 0.7 dB/cm, indicatinga promising solution for low-cost, compact nonlinearphotonic devices with applications in various fieldssuch as telecommunications and spectroscopy.
- PublicationAccès libreMode division multiplexing using orbital angular momentum modes over 1.4 km ring core fiber(Institute of Electrical and Electronics Engineers, 2016-07-27) Mirzaei Nejad, Reza; Amiralizadeh, Siamak; Brunet, Charles; LaRochelle, Sophie; Messaddeq, Younès; Allahverdyan, Karen; Rusch, Leslie; Vaity, PravinMode division multiplexing (MDM) systems using orbital angular momentum (OAM) modes can recover the data in D different modes without recourse to full (2D × 2D) multiple input multiple output (MIMO) processing. One of the biggest challenges in OAM-MDM systems is the mode instability following fiber propagation. Previously, MIMO-free OAM-MDM data transmission with two modes over 1.1 km of vortex fiber was demonstrated, where optical polarization demultiplexing was employed in the setup. We demonstrate MDM data transmission using two OAM modes over 1.4 km of a specially designed ring core fiber without using full MIMO processing or optical polarization demultiplexing. We demonstrate reception with electrical polarization demultiplexing, i.e., minimal 2 × 2 MIMO, showing the compatibility of OAM-MDM with current polarization demultiplexing receivers.
- PublicationAccès libreOrbital-angular-momentum polarization mode dispersion in optical fibers(Institute of Electrical and Electronics Engineers, 2016-04-15) LaRochelle, Sophie; Messaddeq, Younès; Chatigny, Stephane; Wang, Lixian; Rusch, Leslie; Vaity, PravinThe orbital-angular-momentum (OAM) modes in optical fibers have polarization mode dispersion (PMD) properties similar to those of single-mode fibers (SMFs). The +l and -l order OAM modes supported by the same fiber vector modes undergo random cross coupling and exhibit a frequency-dependent time delay. We name this effect “OAM-PMD” and extend the formalism developed for PMD in SMFs to describe OAM-PMD. The characteristics of the modal beat lengths, birefringence correlation lengths, and the mean value of OAM-PMD are investigated. A fixed-analyzer technique is proposed and demonstrated to characterize this phenomenon in OAM fibers. Two different types of OAM fiber are examined. The measured results are compared with the theoretical calculations.
- PublicationAccès libreAnalysis of inter-core cross-gain modulation in cladding pumped multi-core fiber amplifiers(IEEE Xplore, 2018-11-15) Essiambre, René-Jean.; Chen, Haoshuo; Matte-Breton, Charles; Fontaine, Nicolas K.; LaRochelle, Sophie; Ryf, Roland; Messaddeq, YounèsWe numerically investigate pump-induced gain variations in eight-core fi ber amplifi ers. We compare two fi bers with different erbium profi les by varying input power from -25 dBm to 0 dBm in one or four cores. Inter-core cross-gain modulation is < 0.6 dB.
- PublicationAccès libreModeling and characterization of cladding-pumped erbium-ytterbium co-doped fibers for amplification in communication systems(Institute of Electrical and Electronics Engineers, 2019-12-20) Essiambre, René-Jean.; Ryf, Roland; Matte-Breton, Charles; Fontaine, Nicolas K.; LaRochelle, Sophie; Messaddeq, Younès; Chen, Haoshuo; Kelly, C.Cladding-pumped optical fiber amplifiers are of increased interest in the context of space-division multiplexing but are known to suffer from low power efficiency. In this context, ytterbium (Yb) co-doping can be an attractive solution to improve the performance of erbium (Er) doped fiber amplifiers. We present a detailed direct comparison between Er/Yb-co-doping and Er-doping using numerical simulations validated by experimental results. Two double-cladding fibers, one doped with Er only and the other one co-doped with Er and Yb, were designed, fabricated and characterized. Using the experimentally extracted parameters, we simulate multi-core fiber amplifiers and investigate the interest of Er/Yb-co-doping. We calculate the minimum gain of the amplifiers over a 35-nm spectral window considering various scenarios.
- PublicationAccès libreLinearly polarized vector modes : enabling MIMO-free mode-division multiplexing(Optical Society of America, 2017-05-10) Mirzaei Nejad, Reza; Lin, Jiachuan; Corsi, Alessandro; LaRochelle, Sophie; Messaddeq, Younès; Wang, Lixian; Rusch, LeslieWe experimentally investigate mode-division multiplexing in an elliptical ring core fiber (ERCF) that supports linearly polarized vector modes (LPV). Characterization show that the ERCF exhibits good polarization maintaining properties over eight LPV modes with effective index difference larger than 1 × 10−4. The ERCF further displays stable mode power and polarization extinction ratio when subjected to external perturbations. Crosstalk between the LPV modes, after propagating through 0.9 km ERCF, is below −14 dB. By using six LPV modes as independent data channels, we achieved the transmission of 32 Gbaud QPSK over 0.9 km ERCF without any multiple-input-multiple-output (MIMO) or polarization-division multiplexing (PDM) signal processing.
- PublicationRestreintSilicon-coupled tantalum pentoxide microresonators with broadband low thermo-optic coefficient(Optical Society, 2021-07-30) Jean, Philippe; Bah, Souleymane Toubou; LaRochelle, Sophie; Shi, Wei; Messaddeq, Younès; Douaud, AlexandreStable microresonators are important integrated photonics components but are difficult to achieve on silicon-on-insulator due to silicon intrinsic properties. In this work, we demonstrate broadband thermally stable tantalum pentoxide microresonators directly coupled to silicon waveguides using a micro-trench co-integration method. The method combines in-foundry silicon processing with a single step backend thin-film deposition. The passive response of the microresonator and its thermal behavior are investigated. We show that the microresonator can operate in the overcoupled regime as well as near the critical coupling point, boasting an extinction ratio over 25 dB with no higher-order mode excitation. The temperature dependent wavelength shift is measured to be as low as 8.9 pm/K and remains below 10 pm/K over a 120 nm bandwidth.
- 1 (current)