{"id":4298,"date":"2025-06-17T00:00:00","date_gmt":"2025-06-17T00:00:00","guid":{"rendered":"https:\/\/lp.szlogic.cn\/glossary\/dfb-laser-definition\/"},"modified":"2026-06-22T09:27:11","modified_gmt":"2026-06-22T09:27:11","slug":"dfb-laser-definition","status":"publish","type":"post","link":"https:\/\/resourceslp.szlogic.cn\/fr\/glossary\/dfb-laser-definition","title":{"rendered":"Qu\u2019est-ce qu\u2019un laser DFB ?"},"content":{"rendered":"<figure class=\"wp-block-image aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1200\" height=\"712\" src=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/8d76589cf4b2461d80ec5173d4f81a24.webp\" alt=\"What Is DFB Laser\" class=\"wp-image-4295\" srcset=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/8d76589cf4b2461d80ec5173d4f81a24.webp 1200w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/8d76589cf4b2461d80ec5173d4f81a24-300x178.webp 300w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/8d76589cf4b2461d80ec5173d4f81a24-1024x608.webp 1024w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/8d76589cf4b2461d80ec5173d4f81a24-768x456.webp 768w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/8d76589cf4b2461d80ec5173d4f81a24-18x12.webp 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><span>Dans le domaine des communications par fibre optique, <strong>des diodes laser<\/strong> sont au c\u0153ur de tout \u00e9metteur optique. Parmi eux, le <strong>laser \u00e0 r\u00e9troaction distribu\u00e9e (DFB)<\/strong> se distingue par ses hautes performances, sa stabilit\u00e9 et son ad\u00e9quation aux liaisons optiques longue distance et haute vitesse. Ce billet explore <strong>ce qu\u2019est un laser DFB<\/strong>, son <strong>principe de fonctionnement<\/strong>, son <strong>avantages<\/strong>, et la fa\u00e7on dont il se compare \u00e0 <strong>Fabry\u2013P\u00e9rot (FP)<\/strong>, et <strong>VCSEL<\/strong>.<\/span><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" ><span>\ud83d\udd0d D\u00e9finition du laser DFB<\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><span>A <strong>Laser DFB (laser \u00e0 r\u00e9troaction distribu\u00e9e)<\/strong> est un type de <strong>diode laser \u00e0 semi-conducteur<\/strong> dans lequel une <strong>structure p\u00e9riodique<\/strong> (appel\u00e9e <strong>r\u00e9seau de Bragg<\/strong>) est int\u00e9gr\u00e9e directement dans la r\u00e9gion active du laser. Ce r\u00e9seau fournit <strong>une r\u00e9troaction optique distribu\u00e9e<\/strong>, permettant au dispositif d\u2019\u00e9mettre de la lumi\u00e8re \u00e0 une <strong>longueur d\u2019onde unique<\/strong> avec <strong>haute puret\u00e9 spectrale<\/strong>.<\/span><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p><span>Contrairement aux lasers Fabry\u2013P\u00e9rot, qui reposent sur des miroirs extr\u00e9mit\u00e9s pour la r\u00e9troaction et \u00e9mettent plusieurs longueurs d\u2019onde (multi-mode), les lasers DFB suppriment les modes secondaires et d\u00e9livrent une <strong>sortie monomode \u00e0 raie \u00e9troite<\/strong>.<\/span><\/p><\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\" >\ud83e\udde9 Composants cl\u00e9s d\u2019un laser DFB<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><strong>R\u00e9gion active :<\/strong> Le milieu \u00e0 gain semi-conducteur o\u00f9 se produit l\u2019\u00e9mission stimul\u00e9e.<\/p><\/li><li><p><strong>R\u00e9seau de Bragg :<\/strong> Une structure p\u00e9riodique int\u00e9gr\u00e9e dans la r\u00e9gion active qui r\u00e9fl\u00e9chit des longueurs d\u2019onde sp\u00e9cifiques, imposant le fonctionnement monomode.<\/p><\/li><li><p><strong>Structure de d\u00e9calage de phase :<\/strong> Un d\u00e9calage de phase de \u03bb\/4 est souvent introduit pour stabiliser davantage la sortie monomode.<\/p><\/li><li><p><strong>Rev\u00eatements des facettes :<\/strong> Une extr\u00e9mit\u00e9 comporte g\u00e9n\u00e9ralement un rev\u00eatement anti-reflet (AR), tandis que l\u2019autre poss\u00e8de un rev\u00eatement \u00e0 haute r\u00e9flexion (HR) afin d\u2019optimiser la sortie et la r\u00e9troaction.<\/p><\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img decoding=\"async\" width=\"1200\" height=\"712\" src=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/59344372e19640c6be82667e3a2841d7.webp\" alt=\"Distributed Feedback Laser\" class=\"wp-image-4296\" srcset=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/59344372e19640c6be82667e3a2841d7.webp 1200w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/59344372e19640c6be82667e3a2841d7-300x178.webp 300w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/59344372e19640c6be82667e3a2841d7-1024x608.webp 1024w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/59344372e19640c6be82667e3a2841d7-768x456.webp 768w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/59344372e19640c6be82667e3a2841d7-18x12.webp 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" >\u2699\ufe0f Comment fonctionne un laser DFB ?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Le principe de fonctionnement d\u2019un laser DFB repose sur <strong>la r\u00e9flexion de Bragg<\/strong>. Voici comment cela fonctionne :<\/p>\n\n\n\n<ol class=\"wp-block-list\" >\n<li><p><strong>L\u2019injection de courant<\/strong> dans la r\u00e9gion active excite les \u00e9lectrons et les trous.<\/p><\/li><li><p>Leur recombinaison g\u00e9n\u00e8re des photons (lumi\u00e8re).<\/p><\/li><li><p>A <strong>r\u00e9seau de Bragg<\/strong>\u2014 une variation p\u00e9riodique de l\u2019indice de r\u00e9fraction \u2014 est int\u00e9gr\u00e9e dans la r\u00e9gion active.<\/p><\/li><li><p>Le r\u00e9seau ne r\u00e9fl\u00e9chit qu\u2019une longueur d\u2019onde sp\u00e9cifique (la longueur d\u2019onde de Bragg), formant une <strong>onde stationnaire<\/strong>.<\/p><\/li><li><p>Cela provoque <strong>une interf\u00e9rence constructive<\/strong> \u00e0 la longueur d\u2019onde souhait\u00e9e, renfor\u00e7ant un seul mode longitudinal et supprimant les autres.<\/p><\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\" >\ud83c\udd9a Comparaison avec d\u2019autres types de lasers<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" >DFB contre FP contre VCSEL : diff\u00e9rences cl\u00e9s<\/h3>\n\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<colgroup><col style=\"min-width: 25px;\"\/><col style=\"min-width: 25px;\"\/><col style=\"min-width: 25px;\"\/><col style=\"min-width: 25px;\"\/><\/colgroup><tbody><tr><th colspan=\"1\" rowspan=\"1\"><p>Caract\u00e9ristique \/ Type de laser<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p><strong>Laser FP<\/strong><\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p><strong>Laser DFB<\/strong><\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p><strong>Les lasers<\/strong><\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Direction d\u2019\u00e9mission<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Lat\u00e9rale<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Lat\u00e9rale<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Verticale<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Largeur de raie spectrale<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Large<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Tr\u00e8s \u00e9troite<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Mod\u00e9r\u00e9e<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Stabilit\u00e9 en longueur d\u2019onde<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Poor<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Excellent<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Bon<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Vitesse de modulation<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Support<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>High<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>High<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Contr\u00f4le du mode<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Monomode<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Monomode<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Multimode<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Type de fibre<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>SMF<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>SMF<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>FMM<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Longueurs d\u2019onde typiques<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>~1310 nm<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>1270\u20131610 nm<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>~850 nm<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Application typique<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Liaisons anciennes, moyennes et courtes<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Centres de donn\u00e9es, WDM, t\u00e9l\u00e9communications<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Modules \u00e0 courte port\u00e9e et faible co\u00fbt<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Cost<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Faible<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Moyenne \u00e0 \u00e9lev\u00e9e<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Faible<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" >\ud83d\udcc8 Pourquoi utilise-t-on des lasers DFB dans les \u00e9metteurs optiques ?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Les lasers DFB sont largement utilis\u00e9s dans les <strong>\u00e9metteurs-r\u00e9cepteurs optiques<\/strong> \u00e9metteurs optiques pour plusieurs raisons essentielles :<\/p>\n\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<colgroup><col style=\"min-width: 25px;\"\/><col style=\"min-width: 25px;\"\/><\/colgroup><tbody><tr><th colspan=\"1\" rowspan=\"1\"><p>Fonctionnalit\u00e9<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Avantage pour les \u00e9metteurs optiques<\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p><strong>Stabilit\u00e9 en longueur d\u2019onde<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p\/><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p><strong>Raie \u00e9troite<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Permet une modulation haute vitesse et une faible dispersion<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p><strong>Sortie monomode<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>R\u00e9duit les interf\u00e9rences et les crosstalks dans les r\u00e9seaux denses<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p><strong>Faible chirp<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Pr\u00e9serve l\u2019int\u00e9grit\u00e9 du signal sur de longues distances dans la fibre<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p><strong>Sortie r\u00e9glable<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Utile pour l\u2019espacement des canaux dans les syst\u00e8mes WDM<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" >\ud83d\udd17 \u00c0 la recherche de transceivers optiques \u00e0 laser DFB ?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">At <strong>LIEN-PP<\/strong>, nous proposons une gamme compl\u00e8te de modules optiques \u00e9quip\u00e9s de lasers DFB, tels que :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/products\/483196.htm\"><strong>LS-CW6110-10C :<\/strong><\/a><strong> Transceiver CWDM SFP+ 10G pour 40 km<\/strong><\/p><\/li><li><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/products\/483080.htm\"><strong>LS-CW5910-10C<\/strong><\/a><strong>: <\/strong>Transceiver optique 10G pour fibre monomode avec DOM<\/p><\/li><li><p>Modules OEM personnalis\u00e9s pour applications CPRI\/eCPRI<\/p><\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>Les transceivers optiques \u00e0 laser DFB LINK-PP sont enti\u00e8rement compatibles avec les grandes marques et r\u00e9pondent aux normes t\u00e9l\u00e9com rigoureuses.<\/p><\/blockquote>\n\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<colgroup\/><tbody><tr\/><\/tbody>\n<\/table>\n<\/figure>","protected":false},"excerpt":{"rendered":"<p>D\u00e9couvrez ce qu\u2019est un laser DFB (laser \u00e0 r\u00e9troaction distribu\u00e9e), son principe de fonctionnement, sa structure et ses principales diff\u00e9rences avec les lasers FP et VCSEL.<\/p>","protected":false},"author":1,"featured_media":4297,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[27],"tags":[26],"class_list":["post-4298","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-glossary","tag-optics-transceivers"],"blocksy_meta":[],"acf":[],"_links":{"self":[{"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/posts\/4298","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/comments?post=4298"}],"version-history":[{"count":5,"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/posts\/4298\/revisions"}],"predecessor-version":[{"id":11460,"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/posts\/4298\/revisions\/11460"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/media\/4297"}],"wp:attachment":[{"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/media?parent=4298"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/categories?post=4298"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/tags?post=4298"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}