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| Arzelies, Patrick; Drogou, Michele; Opderbecke, Jan; Noel, Claire; Beauchene, Serge; Martin, Christophe; Lachaud, Emilie; Nasr, Amin. |
| This paper deals with underwater acoustic communication, and especially details an innovative approach for off the shelves existing modems performances evaluation. The originality is to be able to predict the operational performances of existing acoustic modems in a real complex situation, without sea trials. |
| Tipo: Text |
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| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00349/45995/46724.pdf |
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| Leon, Pierre; Roland, Francois; Brignone, Lorenzo; Opderbecke, Jan; Greer, Jennifer; Khalighi, M. A.; Hamza, Tasnim; Bourennane, S.; Bigand, M.. |
| Silicon Photomultipliers (SiPMs) have recently been recognized as an interesting alternative to photomultiplier tubes (PMTs) thanks to their high sensitivity and time resolution. They can closely approach quantum-limited sensitivity in the detection of weak optical signals. Ifremer (French Research Institute for Exploitation of the Sea) and Institut Fresnel research lab have been investigating appropriate alternative solutions for PMTs in the context of underwater optical communications, and have for the first time used these new photodetector components for signal detection. A novel prototype of an optical modem based on SiPM receivers was realized with support from Osean SAS Co., a French instrumentation company. A number of lab experiments and sea... |
| Tipo: Text |
Palavras-chave: Optical communications; Underwater communications; Silicon photomultipliers; Photomultiplier tubes. |
| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00435/54677/56495.pdf |
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| Khalighi, Mohammad-ali; Hamza, Tasnim; Bourennane, Salah; Leon, Pierre; Opderbecke, Jan. |
| We study the use of Silicon photo-multipliers (SiPMs) for underwater wireless optical communications (UWOC) and discuss their main interests and drawbacks, compared with photo-multiplier tubes. This comparison is mainly based on practical considerations regarding system implementation and the attainable link span. Presenting an appropriate model for signal attenuation in water and considering the simple On-Off keying modulation, we bring clearance on the real interest of using an SiPM in the UWOC context. We also elucidate the main drawbacks of these components in practice, in particular, regarding the limitation on the transmission data rate, as well as the nonlinear distortion caused on the received signal in relatively short ranges, where the signal... |
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Palavras-chave: Underwater wireless optical communications; Silicon photo-multiplier; Singlephoton avalanche diode; Photo-multiplier tube; Underwater optical channel. |
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00396/50726/51434.pdf |
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| Wheeler, Andrew J.; Beyer, A; Freiwald, A; De Haas, H; Huvenne, V. A. I.; Kozachenko, M; Olu, Karine; Opderbecke, Jan. |
| Cold-water coral carbonate mounds, owing their presence mainly to the framework building coral Lophelia pertusa and the activity of associated organisms, are common along the European margin with their spatial distribution allowing them to be divided into a number of mound provinces. Variation in mound attributes are explored via a series of case studies on mound provinces that have been the most intensely investigated: Belgica, Hovland, Pelagia, Logachev and Norwegian Mounds. Morphological variation between mound provinces is discussed under the premise that mound morphology is an expression of the environmental conditions under which mounds are initiated and grow. Cold-water coral carbonate mounds can be divided into those exhibiting "inherited"... |
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Palavras-chave: Seabed mapping; Environmental setting; Morphology; Cold water coral; Carbonate mound. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-2411.pdf |
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| Fabri, Marie-claire; Loubrieu, Benoit; Dupre, Stephanie; Opderbecke, Jan; Lurton, Xavier. |
| Ce document a pour objectif de préparer une réunion sur le choix du type de charge utile "Acoustique" pour le H-ROV. Ce document s'intéresse à la charge utile "cartographie acoustique". Il est réalisé avec l'objectif de préparer une réunion du groupe de travail scientifique du H-ROV. Il propose un bilan des différentes charges utiles acoustiques embarquables sur un engin sous-marin, ainsi que leur avantages et leurs inconvénients au regard des caractéristiques techniques du H-ROV. Au final un SONDEUR MULTIFAISCEAUX a été le choix considéré comme étant le plus adapté à l'environnement probable d'exploration du HROV (milieu à fort relief) ainsi qu'à ses caractéristiques techniques (autonomie réduite). Lors de l'intégration sur le SKID "Acoustique", il faudra... |
| Tipo: Text |
Palavras-chave: H-ROV; Cartographie acoustique. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00233/34382/32753.pdf |
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| Fabri, Marie-claire; Opderbecke, Jan; Pairaud, Ivane; Drogou, Michele. |
| L'objectif de la campagne était double : (1) réaliser différents tests : AUV et tests acoustiques ainsi que la cartographie de la zone du futur observatoire de neutrinos (2) réaliser la micro-cartographie du fond ainsi que l'acquisition de paramètres environnementaux hydrodynamiques dans une zone accidentée sur laquelle on trouve des écosystèmes marins vulnérables (canyons de Cassidaigne et du Planier). La réalisation de cartographies fines (résolution 2 m) dans une zone accidentée au moyen d'un AUV était un challenge technologique car cet engin autonome est conçu pour naviguer sur des zones planes. Habituellement les consignes de navigation utilisées sont de naviguer à 70 m d'altitude et d'utiliser une fréquence d'acquisition de 300Khz. Ses contraintes de... |
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Palavras-chave: Essais AUV; Bathymétrie fine; Courantologie; Tests acoustiques; Canyons; Méditerranée. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00233/34401/32807.pdf |
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| Hamza, Tasnim; Khalighi, Mohammad-ali; Bourennane, Salah; Leon, Pierre; Opderbecke, Jan. |
| We investigate the effect of environmental noise, caused by solar radiations under water, on the performance of underwater wireless optical communication (UWOC) systems. Presenting an analytical and generic model for this noise, we examine its impact on the link performance in terms of the bit error rate (BER). This study is conducted for different photo-detector types in the aim of highlighting practical limitations of establishing UWOC links in the presence of subsea solar noise. We show how the solar noise can impact the performance of UWOC links for relatively low operation depths. The results we present provide valuable insight for the design of UWOC links, which are likely to be established at relatively low depths. They can be exploited not only for... |
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| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00362/47272/47234.pdf |
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