{"id":1264,"date":"2018-10-18T14:49:37","date_gmt":"2018-10-18T14:49:37","guid":{"rendered":"http:\/\/bale.ch\/journal\/?p=1264"},"modified":"2018-11-28T01:38:19","modified_gmt":"2018-11-28T01:38:19","slug":"percer-les-nuages-pour-mieux-communiquer","status":"publish","type":"post","link":"https:\/\/bale.ch\/journal\/percer-les-nuages-pour-mieux-communiquer\/","title":{"rendered":"Percer les nuages pour mieux communiquer"},"content":{"rendered":"<p><strong>Des chercheurs de l\u2019Universit\u00e9 de Gen\u00e8ve (UNIGE) ont mis au point une technologie qui perce les nuages pour permettre le passage d\u2019informations transmises par laser depuis un satellite.<\/strong><!--more--><\/p>\n<p>Nous vivons \u00e0 l\u2019\u00e8re de l\u2019information \u00e0 grande distance, que ce soit par fibres optiques souterraines ou par radiofr\u00e9quences depuis des satellites. Mais le d\u00e9bit est aujourd\u2019hui tel que la radiofr\u00e9quence ne suffit plus. Les recherches se tournent alors vers le laser qui, bien que techniquement complexe, pr\u00e9sente de nombreux avantages, notamment s\u00e9curitaires. Cette nouvelle technologie, en phase de test actuellement, se heurte toutefois \u00e0 un probl\u00e8me de taille : les nuages. De par leur densit\u00e9, ils stoppent les rayons lasers et brouillent le transfert d\u2019informations. Des chercheurs de l\u2019Universit\u00e9 de Gen\u00e8ve (UNIGE) ont mis au point un laser ultra chaud qui parvient \u00e0 cr\u00e9er un trou temporaire dans le nuage, permettant le passage du rayon laser contenant les informations. Une premi\u00e8re \u00e0 lire dans la revue\u00a0Optica.<\/p>\n<p>Bien que performante, la communication satellite par radiofr\u00e9quences ne parvient plus \u00e0 suivre la demande d\u2019informations qui circulent chaque jour. Ses longueurs d\u2019ondes, longues, limitent la quantit\u00e9 d\u2019informations transmises, les bandes de fr\u00e9quences disponibles se font rares et co\u00fbtent de plus en plus cher et la facilit\u00e9 avec laquelle on peut capter les radiofr\u00e9quences pose des probl\u00e8mes toujours plus aigus de s\u00e9curit\u00e9. C\u2019est pourquoi la recherche se tourne vers le laser. \u00abCette nouvelle technologie est pleine de promesses, rel\u00e8ve Jean-Pierre Wolf, professeur \u00e0 la Section de physique de la Facult\u00e9 des sciences de l\u2019UNIGE. Ses longueurs d\u2019ondes tr\u00e8s courtes permettent de transporter 10\u2019000 fois plus d\u2019informations que la radiofr\u00e9quence, il n\u2019y a pas de limites de canaux et le laser permet de ne cibler qu\u2019une seule personne, permettant une communication hautement s\u00e9curis\u00e9e.\u00bb<\/p><div id=\"crieu-3792729262\" class=\"crieu-content crieu-entity-placement\"><script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-5271584769416742\" crossorigin=\"anonymous\"><\/script><ins class=\"adsbygoogle\" style=\"display:block;\" data-ad-client=\"ca-pub-5271584769416742\" \ndata-ad-slot=\"9321250718\" \ndata-ad-format=\"auto\"><\/ins>\n<script> \n(adsbygoogle = window.adsbygoogle || []).push({}); \n<\/script>\n<\/div>\n<p>Probl\u00e8me : ces rayons lasers ne parviennent pas \u00e0 traverser les nuages et le brouillard. En cas de mauvais temps, il est donc impossible de transmettre une information par ce biais.<\/p>\n<p><strong>Un laser perceur de nuages<\/strong><\/p>\n<p>Pour contrer cette difficult\u00e9, la recherche actuelle multiplie la construction de stations au sol capables de recevoir ces signaux lasers en divers endroits du monde. L\u2019id\u00e9e est de choisir la station vis\u00e9e par le satellite en fonction de la m\u00e9t\u00e9orologie. Bien qu\u2019op\u00e9rationnelle, cette solution reste tributaire des conditions m\u00e9t\u00e9orologiques et pose certains probl\u00e8mes de r\u00e9glages du satellite qui doivent \u00eatre trait\u00e9s en amont de la communication, sans \u00eatre certain qu\u2019il n\u2019y aura aucun nuage au moment choisi.<\/p>\n<p>\u00abNous voulons contourner ce probl\u00e8me en per\u00e7ant un trou directement \u00e0 travers les nuages, afin de permettre le passage du rayon laser\u00bb, explique Jean-Pierre Wolf. Pour ce faire, son \u00e9quipe a mis au point un laser chauffant \u00e0 plus de 1500 degr\u00e9s Celsius et qui, \u00e0 l\u2019aide d\u2019une onde de choc, expulse lat\u00e9ralement les gouttelettes d\u2019eau en suspension qui constituent le nuage, cr\u00e9ant un trou de quelques centim\u00e8tres sur toute son \u00e9paisseur. C\u2019est d\u2019ailleurs la d\u00e9couverte de ces lasers ultrapuissants qui vient d\u2019\u00eatre r\u00e9compens\u00e9e par le Nobel de Physique 2018. \u00abIl suffit ensuite de maintenir ce rayon laser sur le nuage et d\u2019envoyer conjointement le laser qui contient les informations, s\u2019enthousiasme Guillaume Schimmel, chercheur dans l\u2019\u00e9quipe de Jean-Pierre Wolf. Ainsi, il se glisse dans le trou \u00e0 travers le nuage et permet le transfert des donn\u00e9es.\u00bb<\/p>\n<p><strong>Une technologie au point d\u2019ici 2025 ?<\/strong><\/p>\n<p>Actuellement test\u00e9 sur des nuages artificiels de 50cm d\u2019\u00e9paisseur mais contenant 10\u2019000 fois plus d\u2019eau par cm3 qu\u2019un nuage naturel, ce \u00ablaser-nettoyeur\u00bb fonctionne m\u00eame si le nuage est en mouvement. \u00abNos exp\u00e9riences permettent de tester une opacit\u00e9 semblable aux nuages naturels. Il s\u2019agit \u00e0 pr\u00e9sent de le faire sur des nuages plus \u00e9pais, pouvant atteindre un kilom\u00e8tre\u00bb, souligne Jean-Pierre Wolf. \u00abIl s\u2019agit aussi de tester diff\u00e9rentes sortes de nuages, qu\u2019il s\u2019agisse de leur densit\u00e9 ou de leur altitude\u00bb, continue Guillaume Schimmel.<\/p>\n<p>Cette nouvelle technologie est un pas important vers l\u2019utilisation commerciale de la communication laser par satellite. \u00abOn parle d\u2019une possible mise en place globale d\u2019ici 2025, notre id\u00e9e est d\u2019\u00eatre pr\u00eats en m\u00eame temps et de permettre \u00e0 des pays r\u00e9put\u00e9s nuageux de disposer de cette technologie !\u00bb conclut Jean-Pierre Wolf.<\/p>\n<div id=\"crieu-2436681449\" class=\"crieu-apres-le-contenu crieu-entity-placement\" style=\"margin-left: auto;margin-right: auto;text-align: center;\"><script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-5271584769416742\" crossorigin=\"anonymous\"><\/script><ins class=\"adsbygoogle\" style=\"display:block;\" data-ad-client=\"ca-pub-5271584769416742\" \ndata-ad-slot=\"9321250718\" \ndata-ad-format=\"auto\"><\/ins>\n<script> \n(adsbygoogle = window.adsbygoogle || []).push({}); \n<\/script>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Des chercheurs de l\u2019Universit\u00e9 de Gen\u00e8ve (UNIGE) ont mis au point une technologie qui perce les nuages pour permettre le passage d\u2019informations transmises par laser depuis un satellite.<\/p>\n","protected":false},"author":2,"featured_media":1265,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[103,4,17],"tags":[85],"class_list":["post-1264","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actu","category-grand-geneve","category-savoirs","tag-universite-de-geneve"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - 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