{"id":56969,"date":"2023-03-23T15:06:28","date_gmt":"2023-03-23T13:06:28","guid":{"rendered":"https:\/\/www.iemn.fr\/?p=56969"},"modified":"2023-03-23T15:06:28","modified_gmt":"2023-03-23T13:06:28","slug":"these-b-sawadogo-conception-et-mise-en-oeuvre-demetteurs-terahertz-multiples-via-lassociation-de-fibre-multi-coeurs-et-de-reseaux-de-photodiodes-application-aux-telecommunications-a-tres-haut","status":"publish","type":"post","link":"https:\/\/www.iemn.fr\/en\/theses-2022\/these-b-sawadogo-conception-et-mise-en-oeuvre-demetteurs-terahertz-multiples-via-lassociation-de-fibre-multi-coeurs-et-de-reseaux-de-photodiodes-application-aux-telecommunications-a-tres-haut.html","title":{"rendered":"THESE B. SAWADOGO \u00ab\u00a0Conception et mise en oeuvre d&rsquo;\u00e9metteurs Terahertz multiples via l&rsquo;association de fibre multi-coeurs et de r\u00e9seaux de photodiodes : application aux t\u00e9l\u00e9communications \u00e0 tr\u00e8s haut d\u00e9bit \u00ab\u00a0"},"content":{"rendered":"<div id='layer_slider_1'  class='avia-layerslider main_color avia-shadow  avia-builder-el-0  el_before_av_heading  avia-builder-el-first  container_wrap sidebar_right'  style='height: 261px;'  ><div id=\"layerslider_58_14o2rpjxepj4r\" data-ls-slug=\"homepageslider\" class=\"ls-wp-container fitvidsignore ls-selectable\" style=\"width:1140px;height:260px;margin:0 auto;margin-bottom: 0px;\"><div class=\"ls-slide\" data-ls=\"duration:6000;transition2d:5;\"><img loading=\"lazy\" decoding=\"async\" width=\"2600\" height=\"270\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1.jpg\" class=\"ls-bg\" alt=\"\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1.jpg 2600w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1-300x31.jpg 300w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1-768x80.jpg 768w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1-1030x107.jpg 1030w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1-1500x156.jpg 1500w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1-705x73.jpg 705w\" sizes=\"auto, (max-width: 2600px) 100vw, 2600px\" \/><ls-layer style=\"font-size:14px;text-align:left;font-style:normal;text-decoration:none;text-transform:none;font-weight:700;letter-spacing:0px;border-style:solid;border-color:#000;background-position:0% 0%;background-repeat:no-repeat;width:180px;height:30px;left:0px;top:231px;line-height:32px;color:#ffffff;border-radius:6px 6px 6px 6px;padding-left:50px;background-color:rgba(0, 0, 0, 0.57);\" class=\"ls-l ls-ib-icon ls-text-layer\" data-ls=\"minfontsize:0;minmobilefontsize:0;\"><i class=\"fa fa-quote-right\" style=\"color:#ffffff;margin-right:0.8em;font-size:1em;transform:translateY( -0.125em );\"><\/i>ACTUALITES<\/ls-layer><\/div><\/div><\/div><div id='after_layer_slider_1'  class='main_color av_default_container_wrap container_wrap sidebar_right'  ><div class='container av-section-cont-open' ><div class='template-page content  av-content-small alpha units'><div class='post-entry post-entry-type-page post-entry-56969'><div class='entry-content-wrapper clearfix'>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-lfl4lebo-005bdf7648fb0d47f3cf7af08b564aa8\">\n#top .av-special-heading.av-lfl4lebo-005bdf7648fb0d47f3cf7af08b564aa8{\nmargin:0 0 10px 0;\npadding-bottom:4px;\n}\nbody .av-special-heading.av-lfl4lebo-005bdf7648fb0d47f3cf7af08b564aa8 .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-lfl4lebo-005bdf7648fb0d47f3cf7af08b564aa8 .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-lfl4lebo-005bdf7648fb0d47f3cf7af08b564aa8 av-special-heading-h2  avia-builder-el-1  el_after_av_layerslider  el_before_av_hr  avia-builder-el-first'><h2 class='av-special-heading-tag'  itemprop=\"headline\"  >THESE B. SAWADOGO \u00ab\u00a0Conception et mise en oeuvre d\u2018\u00e9metteurs Terahertz multiples via l\u2019association de fibre multi-coeurs et de r\u00e9seaux de photodiodes : application aux t\u00e9l\u00e9communications \u00e0 tr\u00e8s haut d\u00e9bit \u00ab\u00a0<\/h2><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-18u73nj-dad6a947580930e400fc42ba200e80f1\">\n#top .hr.av-18u73nj-dad6a947580930e400fc42ba200e80f1{\nmargin-top:5px;\nmargin-bottom:5px;\n}\n.hr.av-18u73nj-dad6a947580930e400fc42ba200e80f1 .hr-inner{\nwidth:100%;\n}\n<\/style>\n<div  class='hr av-18u73nj-dad6a947580930e400fc42ba200e80f1 hr-custom  avia-builder-el-2  el_after_av_heading  el_before_av_textblock  hr-left hr-icon-no'><span class='hr-inner inner-border-av-border-thin'><span class=\"hr-inner-style\"><\/span><\/span><\/div>\n<section  class='av_textblock_section av-jriy64i8-2f4600354c0449b610997916bbd9b6bc'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" >\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-13ewzjw-68e036126b913e5028f77311dc66b825\">\n.av_font_icon.av-13ewzjw-68e036126b913e5028f77311dc66b825{\ncolor:#bfbfbf;\nborder-color:#bfbfbf;\n}\n.av_font_icon.av-13ewzjw-68e036126b913e5028f77311dc66b825 .av-icon-char{\nfont-size:60px;\nline-height:60px;\n}\n<\/style>\n<span  class='av_font_icon av-13ewzjw-68e036126b913e5028f77311dc66b825 avia_animate_when_visible av-icon-style- avia-icon-pos-left avia-icon-animate'><span class='av-icon-char' aria-hidden='true' data-av_icon='\ue8c9' data-av_iconfont='entypo-fontello' ><\/span><\/span>\n<p><strong>B. SAWADOGO<\/strong><\/p>\n<p>Soutenance : 25 octobre 2022<\/p>\n<p>Th\u00e8se de doctorat en Electronique, photonique, Universit\u00e9 de Lille, ED ENGSYS Sciences de l\u2019ing\u00e9nierie et des syst\u00e8mes,<\/p>\n<\/div><\/section>\n<section  class='av_textblock_section av-jtefqx33-628129dba2299b2ecd65ebfc92eac29d'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><div  class='hr av-kjh3zw-4dff888f744b728a1aca9b3a0971493a hr-default  avia-builder-el-6  avia-builder-el-no-sibling'><span class='hr-inner'><span class=\"hr-inner-style\"><\/span><\/span><\/div>\n<h5><strong><span style=\"color: #800000;\">\u00a0<\/span><\/strong><\/h5>\n<h5>Summary:<\/h5>\n<p>Les pr\u00e9visions de CISCO indiquent que la demande en capacit\u00e9 de transmission ne cesse de cro\u00eetre au fil des ann\u00e9es. En plus des utilisations actuelles, on assiste \u00e0 l\u2019\u00e9mergence de nouvelles applications telles que la r\u00e9alit\u00e9 augment\u00e9e, les hologrammes, ou encore les communications entre v\u00e9hicules qui exigent des capacit\u00e9s de l\u2019ordre de la centaine de Gbit\/s et plus. Dans le domaine des radiocommunications, diff\u00e9rentes approches sont envisag\u00e9es en vue de r\u00e9pondre \u00e0 ces besoins. La premi\u00e8re consiste en des syst\u00e8mes MIMO o\u00f9 l\u2019agr\u00e9gation de plusieurs canaux permet d\u2019atteindre des d\u00e9bits plus \u00e9lev\u00e9s que l\u2019\u00e9tat de l\u2019art. La seconde est l\u2019investigation de nouvelles bandes de fr\u00e9quences dont la gamme THz (100 GHz-10 THz). Dans ce sens, la bande 250-320 GHz, qui a fait l\u2019objet d\u2019une standardisation (IEEE.802.15.3d) en 2017, apparait particuli\u00e8rement prometteuse car elle pr\u00e9sente un bon compromis entre bande passante et performances technologiques. Diff\u00e9rentes d\u00e9monstrations de liaisons ont \u00e9t\u00e9 faites dans cette bande \u00e0 l\u2019aide d\u2019\u00e9metteurs et de r\u00e9cepteurs opto\u00e9lectroniques. Cependant, force est de constater que les bilans de liaison sont pour la plupart d\u00e9grad\u00e9s non seulement \u00e0 cause de l\u2019att\u00e9nuation atmosph\u00e9rique et des pertes en espace libre \u00e9lev\u00e9es \u00e0 ces fr\u00e9quences (10 dB\/m \u00e0 300 GHz) mais aussi en raison des relatives faibles puissances des \u00e9metteurs THz, surtout lorsqu\u2019ils sont bas\u00e9s sur le photo-m\u00e9lange (typiquement moins de 0 dBm). Ceci constitue un frein au d\u00e9veloppement de transmissions sur de longues distances bas\u00e9es sur cette technologie. Dans le but de permettre des communications \u00e0 tr\u00e8s haut d\u00e9bit avec de meilleurs bilans de liaison, cette th\u00e8se r\u00e9unit deux briques technologiques diff\u00e9rentes. D\u2019une part, nous d\u00e9veloppons un r\u00e9seau d\u2019\u00e9metteurs THz constitu\u00e9 de photodiodes qui, gr\u00e2ce au principe de la combinaison de puissance bien connu en radiofr\u00e9quence, permet au syst\u00e8me de g\u00e9n\u00e9rer plus de puissance THz que des \u00e9metteurs unitaires classiques. D\u2019autre part, pour exciter le r\u00e9seau de photodiodes, nous tirons parti d\u2019une nouvelle g\u00e9n\u00e9ration de fibres optiques, les fibres multi-c?urs, qui trouve \u00e9galement un int\u00e9r\u00eat pour la r\u00e9alisation du multiplexage spatial dans les futurs r\u00e9seaux optiques. En assemblant ces deux briques technologiques, nous d\u00e9montrons, pour la premi\u00e8re fois \u00e0 notre connaissance, l\u2019excitation d\u2019un r\u00e9seau de 4 photodiodes par une fibre \u00e0 4 coeurs. L\u2019int\u00e9r\u00eat de ce travail est qu\u2019il d\u00e9montre la possibilit\u00e9 de r\u00e9aliser des liaisons autour de 300 GHz \u00e0 des d\u00e9bits allant jusqu\u2019\u00e0 100 Gbit\/s, avec de meilleures bilans de liaison que ceux des liaisons bas\u00e9es sur une photodiode unitaire. Alternativement, il serait possible de r\u00e9aliser le multiplexage spatial de donn\u00e9es sur 4 porteuses THz diff\u00e9rentes dans le but d\u2019atteindre des d\u00e9bits de plusieurs centaines de Gbit\/s. Du reste, nous investiguons, dans ce travail, de nouvelles bandes pour les communications THz \u00e0 travers la caract\u00e9risation d\u2019une photodiode unitaire \u00e0 800 GHz pour des d\u00e9bits allant \u00e0 10 Gbit\/s.<\/p>\n<h5>Abstract:<\/h5>\n<p>CISCO forecasts that the demand for transmission capacity will continue to grow over the years. In addition to current uses, new applications are emerging such as augmented reality, holograms, and vehicle-to-vehicle communications that require capacities in the hundreds of Gbps and more. In the field of radiocommunications, different approaches are being considered to meet these needs. The first one consists in MIMO systems where the aggregation of several channels allows to reach higher data rates than the state of the art. The second is the investigation of new frequency bands including the THz range (100 GHz-10 THz). In this sense, the 250-320 GHz band, which was standardized (IEEE.802.15.3d) in 2017, appears particularly promising because it offers a good compromise between bandwidth and technological performance. Various demonstrations of links have been made in this band using optoelectronic transmitters and receivers. However, it must be noted that the link budgets are mostly degraded not only because of atmospheric attenuation and high free space losses at these frequencies (10 dB\/m at 300 GHz) but also because of the relatively low power of THz transmitters, especially when they are based on photo-mixing (typically less than 0 dBm). This is an obstacle to the development of long distance transmissions based on this technology. In order to enable very high speed communications with better link budgets, this thesis brings together two different technological building blocks. On the one hand, we develop an array of THz transmitters made of photodiodes which, thanks to the principle of power combination well known in radio frequency, allows the system to generate more THz power than classical unitary transmitters. On the other hand, to excite the photodiode array, we take advantage of a new generation of optical fibers, the multi-core fibers, which is also of interest for the realization of spatial multiplexing in future optical networks. By assembling these two technological bricks, we demonstrate, for the first time to our knowledge, the excitation of a 4 photodiode array by a 4-core fiber. The interest of this work is that it demonstrates the possibility of realizing links around 300 GHz at rates up to 100 Gbit\/s, with better link budgets than those of links based on a single photodiode. Alternatively, it would be possible to perform spatial data multiplexing on 4 different THz carriers in order to reach data rates of several hundred Gbit\/s. Moreover, we investigate, in this work, new bands for THz communications through the characterization of a unitary photodiode at 800 GHz for data rates up to 10 Gbit\/s.<\/p>\n<\/div><\/section>","protected":false},"excerpt":{"rendered":"","protected":false},"author":20,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[316],"tags":[],"class_list":["post-56969","post","type-post","status-publish","format-standard","hentry","category-theses-2022"],"_links":{"self":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/56969","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/users\/20"}],"replies":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/comments?post=56969"}],"version-history":[{"count":0,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/56969\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media?parent=56969"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/categories?post=56969"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/tags?post=56969"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}