{"id":883,"date":"2026-06-18T15:17:21","date_gmt":"2026-06-18T07:17:21","guid":{"rendered":"https:\/\/www.owiregroup.com\/?p=883"},"modified":"2026-06-18T15:19:09","modified_gmt":"2026-06-18T07:19:09","slug":"aoc-vs-dac-a-comprehensive-technical-guide-to-selecting-active-optical-cables-for-modern-ai-hpc-fabrics","status":"publish","type":"post","link":"https:\/\/www.owiregroup.com\/fr\/news\/faq-guides\/aoc-vs-dac-a-comprehensive-technical-guide-to-selecting-active-optical-cables-for-modern-ai-hpc-fabrics\/","title":{"rendered":"AOC vs DAC : guide technique complet pour le choix des c\u00e2bles optiques actifs destin\u00e9s aux structures modernes d'IA et de calcul haute performance (HPC)"},"content":{"rendered":"

C\u00e2ble optique actif (AOC) : l'interconnexion centrale pour les r\u00e9seaux \u00e0 haut d\u00e9bit<\/h1>\n\n\n\n
\n

Guide technique complet sur les AOC destin\u00e9s aux centres de donn\u00e9es, au calcul haute performance (HPC) et aux clusters d'IA (environ 2 000 mots, avec des emplacements r\u00e9serv\u00e9s pour les images)<\/p>\n\n\n\n

\"D\u00e9ploiement<\/figure>\n\n\n\n

Figure 1 : D\u00e9ploiement \u00e0 grande \u00e9chelle de c\u00e2bles optiques actifs dans un centre de donn\u00e9es hyperscale moderne.<\/em><\/p>\n<\/blockquote>\n\n\n\n

\n\n\n\n

1. Qu'est-ce qu'un c\u00e2ble optique actif (AOC) ?<\/h2>\n\n\n\n

Un C\u00e2ble optique actif (AOC)<\/strong> Il s'agit d'un assemblage de c\u00e2ble \u00e0 fibre optique dot\u00e9 d'\u00e9metteurs-r\u00e9cepteurs optiques int\u00e9gr\u00e9s de mani\u00e8re permanente \u00e0 ses deux extr\u00e9mit\u00e9s. Il permet de remplacer la connexion traditionnelle en deux \u00e9tapes \u2014module enfichable<\/em> + c\u00e2ble de raccordement \u00e0 fibre optique<\/em>\u2014en un seul ensemble pr\u00eat \u00e0 l'emploi, assembl\u00e9 en usine.<\/p>\n\n\n\n

Chaque extr\u00e9mit\u00e9 du c\u00e2ble comporte un dispositif miniaturis\u00e9 moteur optique<\/strong> qui comprend g\u00e9n\u00e9ralement :<\/p>\n\n\n\n

    \n
  • A laser VCSEL<\/strong> (source lumineuse multimode \u00e0 850 nm)<\/li>\n\n\n\n
  • A circuit int\u00e9gr\u00e9 de commande laser<\/strong><\/li>\n\n\n\n
  • A Amplificateur \u00e0 transimp\u00e9dance (TIA)<\/strong><\/li>\n\n\n\n
  • A DSP \/ CDR<\/strong> pour le traitement des signaux<\/li>\n\n\n\n
  • Un MCU<\/strong> pour le diagnostic et le contr\u00f4le<\/li>\n<\/ul>\n\n\n\n

    Les AOC emploient g\u00e9n\u00e9ralement Fibre multimode OM3 ou OM4<\/strong> comme support de transmission. Les donn\u00e9es sont converties de signaux \u00e9lectriques en impulsions optiques, transmises par la fibre, puis reconverties en signaux \u00e9lectriques \u00e0 l'autre extr\u00e9mit\u00e9. Il en r\u00e9sulte une interconnexion \u00e0 haut d\u00e9bit, l\u00e9g\u00e8re et insensible aux interf\u00e9rences \u00e9lectromagn\u00e9tiques.<\/p>\n\n\n

    \n
    \"Structure<\/figure>\n<\/div>\n\n\n


    Figure 2 : Sch\u00e9ma fonctionnel interne d'un AOC \u2014 signal \u00e9lectrique \u2192 circuit d'attaque \u2192 VCSEL \u2192 fibre optique \u2192 photodiode \/ TIA \u2192 signal \u00e9lectrique.<\/em><\/p>\n\n\n\n

    \n\n\n\n

    2. AOC ou DAC : pourquoi choisir l'AOC ?<\/h2>\n\n\n\n

    Dans le domaine des interconnexions \u00e0 courte port\u00e9e, les c\u00e2bles AOC sont le plus souvent compar\u00e9s \u00e0 Cuivre \u00e0 connexion directe (DAC)<\/strong> c\u00e2bles. Le tableau ci-dessous met en \u00e9vidence leurs principales diff\u00e9rences :<\/p>\n\n\n\n

    Sp\u00e9cifications<\/th>DAC (cuivre \u00e0 raccordement direct)<\/th>AOC (c\u00e2ble optique actif)<\/th><\/tr><\/thead>
    D\u00e9bit maximal<\/td>Limit\u00e9 \u00e0 100 G ; viable \u00e0 400 G pour des s\u00e9ries tr\u00e8s courtes<\/td>Couverture compl\u00e8te de 10G \u00e0 800G+<\/td><\/tr>
    Port\u00e9e<\/td>\u2264 3 m \u00e0 100 G, \u2264 2 m \u00e0 400 G<\/td>Jusqu'\u00e0 100 m via OM4<\/td><\/tr>
    Poids<\/td>Lourd, grand rayon de courbure<\/td>environ 1\/4 du poids d'un DAC \u00e9quivalent<\/td><\/tr>
    Dissipation thermique<\/td>\u00c9lev\u00e9<\/td>Bas, compatible avec les commutateurs<\/td><\/tr>
    Immunit\u00e9 aux interf\u00e9rences \u00e9lectromagn\u00e9tiques<\/td>Faible<\/td>Excellent (le signal optique n'est pas conducteur)<\/td><\/tr>
    Co\u00fbt par port<\/td>Faible<\/td>Mod\u00e9r\u00e9<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

    En r\u00e9sum\u00e9 :<\/strong> D\u00e8s que la vitesse atteint 100 G et que la distance d\u00e9passe environ 5 m, l'AOC prend le dessus sur performances, densit\u00e9 et facilit\u00e9 d'utilisation<\/strong>. C'est pourquoi, depuis l'\u00e8re des 200G, les AOC sont devenus les de facto<\/em> solution de choix pour les liaisons ToR-Leaf dans les centres de donn\u00e9es.<\/p>\n\n\n

    \n
    \"Comparaison<\/figure>\n<\/div>\n\n\n


    Figure 3 : Comparaison du volume, du poids et de la densit\u00e9 de ports entre les mod\u00e8les AOC et DAC dans un panneau de commutation 400G.<\/em><\/p>\n\n\n\n

    \n\n\n\n

    3. \u00c9volution des d\u00e9bits : de 10G \u00e0 800G<\/h2>\n\n\n\n

    Les d\u00e9bits AOC ont \u00e9volu\u00e9 au rythme des normes Ethernet :<\/p>\n\n\n\n

      \n
    1. C\u00e2ble AOC 10G SFP+<\/strong> \u2014 la premi\u00e8re carte AOC grand public, utilis\u00e9e \u00e0 l'int\u00e9rieur des baies de serveurs pour la connectivit\u00e9 ToR.<\/li>\n\n\n\n
    2. C\u00e2ble AOC SFP28 25G<\/strong> \u2014 en raison de l'essor des serveurs cloud \u00ab white-box \u00bb ; toujours largement utilis\u00e9s.<\/li>\n\n\n\n
    3. C\u00e2ble AOC 40G QSFP+<\/strong> \u2014 4 voies 10G, couvrant des distances comprises entre 1 m et 100 m.<\/li>\n\n\n\n
    4. AOC QSFP28 100G<\/strong> \u2014 4 voies de 25G, le pilier des clusters d'IA de la g\u00e9n\u00e9ration pr\u00e9c\u00e9dente.<\/li>\n\n\n\n
    5. C\u00e2ble optique AOC QSFP56 200G<\/strong> \u2014 4 \u00d7 50G PAM4 ; une solution de transition pour les hyperscalers.<\/li>\n\n\n\n
    6. C\u00e2ble AOC QSFP-DD \/ OSFP 400G<\/strong> \u2014 8 \u00d7 50G PAM4, le c\u0153ur des structures modernes d'IA et de calcul haute performance (HPC).<\/li>\n\n\n\n
    7. C\u00e2ble AOC 800G OSFP \/ QSFP-DD800<\/strong> \u2014 8 \u00d7 100G PAM4, dont la production est en cours d'extension depuis 2024.<\/li>\n\n\n\n
    8. 1,6 T (en cours de d\u00e9veloppement)<\/strong> \u2014 en vue de la g\u00e9n\u00e9ration 2026-2027 de structures d'IA.<\/li>\n<\/ol>\n\n\n\n
      \n

      \ud83d\udca1 Point cl\u00e9 :<\/strong> \u00c0 partir de 400G, les c\u00e2bles AOC adoptent presque syst\u00e9matiquement PAM4 (modulation d'amplitude d'impulsion \u00e0 4 niveaux)<\/strong> en combinaison avec Traitement du signal par DSP<\/strong> afin de maintenir l'efficacit\u00e9 spectrale et les performances en termes de taux d'erreur sur les bits (BER).<\/p>\n<\/blockquote>\n\n\n

      \n
      \"Forme<\/figure>\n<\/div>\n\n\n


      Figure 4 : C\u00e2ble AOC 800G QSFP-DD800 \u2014 la conception des ailettes du dissipateur thermique permet le remplacement \u00e0 chaud dans les commutateurs \u00e0 haute densit\u00e9.<\/em><\/p>\n\n\n\n

      \n\n\n\n

      4. Sc\u00e9narios d'application principaux<\/h2>\n\n\n\n

      4.1 Cloud et centres de donn\u00e9es hyperscale<\/h3>\n\n\n\n

      Les AOC se connectent serveurs \u2194 commutateurs ToR<\/strong> et commutateurs \u00ab feuille \u00bb \u2194 \u00ab \u00e9pine \u00bb<\/strong>. Un seul commutateur 1U \u00e0 32 ports 400G permet de distribuer 32 connecteurs AOC \u00e0 partir d'une seule face avant, sans encombrement ni probl\u00e8me thermique.<\/p>\n\n\n\n

      4.2 Clusters d'entra\u00eenement IA (matrices GPU \/ TPU)<\/h3>\n\n\n\n

      Dans les architectures NVIDIA NVL, InfiniBand NDR\/HDR et autres infrastructures d'IA similaires, C\u00e2bles AOC de 400 G \/ 800 G<\/strong> constituent les supports d'interconnexion privil\u00e9gi\u00e9s pour les n\u0153uds GPU. Par rapport aux DAC, les AOC offrent :<\/p>\n\n\n\n

        \n
      • Une plus grande distance (il est courant que la distance entre les armoires GPU soit d'au moins 5 m)<\/li>\n\n\n\n
      • Une densit\u00e9 plus \u00e9lev\u00e9e<\/li>\n\n\n\n
      • Taux d'erreur sur les bits (BER) plus faible<\/li>\n<\/ul>\n\n\n\n

        \u2014 autant d\u2019\u00e9l\u00e9ments essentiels pour garantir la stabilit\u00e9 des sessions d\u2019entra\u00eenement des grands mod\u00e8les.<\/p>\n\n\n\n

        4.3 Calcul haute performance (HPC)<\/h3>\n\n\n\n

        Exigences des clusters HPC latence d\u00e9terministe<\/strong> et un d\u00e9bit \u00e9lev\u00e9. Les AOC offrant un chemin de conversion \u00e9lectrique-optique stable et pr\u00e9visible, ils constituent le support de liaison pr\u00e9dominant dans les syst\u00e8mes InfiniBand HDR\/NDR.<\/p>\n\n\n\n

        4.4 Fronthaul \/ Midhaul 5G<\/h3>\n\n\n\n

        Certains d\u00e9ploiements de fronthaul mobile 5G utilisent des c\u00e2bles AOC 25G \/ 100G pour remplacer les anciennes solutions CPRI, r\u00e9duction des d\u00e9penses d'investissement<\/strong> pour les op\u00e9rateurs.<\/p>\n\n\n

        \n
        \"C\u00e2blage<\/figure>\n<\/div>\n\n\n


        Figure 5 : Sch\u00e9ma de c\u00e2blage AOC 400G\/800G typique \u00e0 l'arri\u00e8re d'un rack de formation en IA (de type DGX SuperPOD).<\/em><\/p>\n\n\n\n

        \n\n\n\n

        5. Principales sp\u00e9cifications techniques \u00e0 \u00e9valuer<\/h2>\n\n\n\n

        Lors de la s\u00e9lection ou de la validation des AOC, veillez tout particuli\u00e8rement \u00e0 :<\/p>\n\n\n\n

          \n
        • D\u00e9bit de donn\u00e9es et protocole<\/strong> \u2014 Conformit\u00e9 aux normes IEEE 802.3, QSFP-DD MSA, OSFP MSA et CMIS.<\/li>\n\n\n\n
        • Port\u00e9e<\/strong> \u2014 longueurs courantes : 3 \/ 5 \/ 10 \/ 30 \/ 50 \/ 100 m.<\/li>\n\n\n\n
        • Bilan de puissance optique<\/strong> \u2014 Puissance d'\u00e9mission, sensibilit\u00e9 de r\u00e9ception, rapport d'extinction.<\/li>\n\n\n\n
        • BER<\/strong> \u2014 Le BER pr\u00e9-FEC est g\u00e9n\u00e9ralement \u2264 1E-6 ou 1E-8.<\/li>\n\n\n\n
        • Consommation \u00e9lectrique<\/strong> \u2014 Un c\u00e2ble AOC de 400G consomme g\u00e9n\u00e9ralement \u2264 10 W par extr\u00e9mit\u00e9.<\/li>\n\n\n\n
        • Temp\u00e9rature de fonctionnement<\/strong> \u2014 usage commercial : 0\u201370 \u00b0C, usage industriel : -40\u201385 \u00b0C.<\/li>\n\n\n\n
        • Diagnostics<\/strong> \u2014 DDM\/DOM, CMIS 4.0.<\/li>\n\n\n\n
        • Rayon de courbure<\/strong> \u2014 g\u00e9n\u00e9ralement \u2265 30 mm (valeur plus stricte pour les fibres OM4).<\/li>\n\n\n\n
        • Indice d'inflammabilit\u00e9<\/strong> \u2014 OFNR \/ OFNP \/ LSZH pour r\u00e9pondre aux normes de s\u00e9curit\u00e9 incendie des centres de donn\u00e9es.<\/li>\n<\/ul>\n\n\n\n
          \n\n\n\n

          6. Sept conseils pratiques pour la s\u00e9lection et la mise en \u0153uvre<\/h2>\n\n\n\n
            \n
          1. Verrouiller la pile de protocoles.<\/strong> Les AOC doivent correspondre exactement aux protocole<\/strong> du commutateur\/de la carte r\u00e9seau \u2014 400G DR4 \u2260 400G FR4 \u2260 400G SR4.<\/li>\n\n\n\n
          2. Ne m\u00e9langez jamais les formats MSA.<\/strong> Les normes QSFP-DD et OSFP sont physiquement incompatibles ; toute incompatibilit\u00e9 peut endommager les bo\u00eetiers.<\/li>\n\n\n\n
          3. Augmenter la marge de longueur.<\/strong> Les chemins r\u00e9els comprennent les chemins de c\u00e2bles et les ponts a\u00e9riens \u2014 longueur \u00e0 commander = distance physique \u00d7 1,2.<\/li>\n\n\n\n
          4. Faites attention au flux d'air.<\/strong> Dans les d\u00e9ploiements AOC \u00e0 forte densit\u00e9, Le flux d'air de l'avant vers l'arri\u00e8re doit correspondre au sens de rotation du ventilateur du commutateur<\/strong>.<\/li>\n\n\n\n
          5. Privil\u00e9giez les fournisseurs certifi\u00e9s.<\/strong> Choisissez des fournisseurs dont les modules ont \u00e9t\u00e9 valid\u00e9s sur les principales plateformes de commutateurs (Arista, Cisco, NVIDIA\/Mellanox, H3C, Huawei).<\/li>\n\n\n\n
          6. \u00c9tiquetez tout.<\/strong> Chaque AOC doit \u00eatre muni d'une \u00e9tiquette unique comportant un code QR ou un code-barres \u00e0 des fins de gestion de la base de donn\u00e9es de configuration (CMDB) et de d\u00e9pannage.<\/li>\n\n\n\n
          7. Effectuer un test avant la mise en service.<\/strong> Utilisez un mesureur de puissance optique et un BERT pour effectuer des contr\u00f4les ponctuels (fr\u00e9quence d'\u00e9chantillonnage recommand\u00e9e : ~5%) avant la mise en service.<\/li>\n\n\n\n
          8. <\/li>\n<\/ol>\n\n\n\n
            \"Meilleures<\/figure>\n\n\n\n


            Figure 6 : Rayon de courbure recommand\u00e9 (\u2265 30 mm) et agencement des chemins de c\u00e2bles a\u00e9riens pour les c\u00e2bles AOC.<\/em><\/p>\n\n\n\n

            \n\n\n\n

            7. Tendances futures : 1,6 T, LPO et CPO<\/h2>\n\n\n\n
              \n
            • Cartes graphiques 1,6 T :<\/strong> Avec l'arriv\u00e9e des SerDes 200G, les c\u00e2bles AOC OSFP 1,6 T feront leur apparition dans les structures d'IA en 2026-2027.<\/li>\n\n\n\n
            • LPO (optique lin\u00e9aire enfichable) :<\/strong> Supprime le DSP, ce qui permet de r\u00e9duire la consommation d'\u00e9nergie jusqu'\u00e0 50%. Les d\u00e9ploiements pilotes ont d\u00e9but\u00e9 en 2025 \u2014 il s'agit d'une variante all\u00e9g\u00e9e de l'AOC.<\/li>\n\n\n\n
            • CPO (optique co-emball\u00e9e) :<\/strong> Int\u00e8gre directement le module optique au circuit ASIC du commutateur, ce qui devrait permettre une r\u00e9duction suppl\u00e9mentaire de la consommation de 30%+. L'\u00e9cosyst\u00e8me est encore en phase de maturation ; la mont\u00e9e en puissance commerciale est pr\u00e9vue apr\u00e8s 2027.<\/li>\n\n\n\n
            • Photonique sur silicium :<\/strong> Les futurs AOC recourront de plus en plus \u00e0 SiPh<\/strong> des proc\u00e9d\u00e9s visant \u00e0 r\u00e9duire la taille et \u00e0 diminuer les co\u00fbts.<\/li>\n<\/ul>\n\n\n\n
              \"Feuille<\/figure>\n\n\n\n


              Figure 7 : \u00c9volution des interconnexions optiques \u2014 AOC \u2192 LPO \u2192 CPO \u2192 co-encapsulation avec la photonique sur silicium.<\/em><\/p>\n\n\n\n

              \n\n\n\n

              8. Conclusion<\/h2>\n\n\n\n

              Le c\u00e2ble optique actif a discr\u00e8tement \u00e9volu\u00e9, passant du statut de \u201c c\u00e2ble invisible \u00e0 l'int\u00e9rieur d'un rack \u201d \u00e0 celui de couche physique fondamentale pour les centres de donn\u00e9es et les structures de calcul de l'\u00e8re de l'IA<\/strong>. En tirant parti des faibles pertes et de l'immunit\u00e9 aux interf\u00e9rences \u00e9lectromagn\u00e9tiques (EMI) de la fibre optique, les c\u00e2bles AOC offrent la haute densit\u00e9, la haute vitesse et la grande fiabilit\u00e9 exig\u00e9es par les r\u00e9seaux modernes.<\/p>\n\n\n\n

              Pour les ing\u00e9nieurs charg\u00e9s de mettre en place des clusters d'entra\u00eenement d'IA, de passer \u00e0 des structures de r\u00e9seau 400G\/800G ou d'optimiser le c\u00e2blage des centres de donn\u00e9es dans le cloud, Comprendre le fonctionnement des AOC, l'\u00e9volution de leurs sp\u00e9cifications, ainsi que la mani\u00e8re de les choisir et de les d\u00e9ployer correctement constitue la premi\u00e8re \u00e9tape pour \u00e9viter des erreurs co\u00fbteuses et optimiser le retour sur investissement.<\/strong>.<\/p>\n\n\n\n

              ","protected":false},"excerpt":{"rendered":"

              Active Optical Cable (AOC): The Core Interconnect for High-Speed Networking 1. What Is an Active Optical Cable (AOC)? An Active Optical Cable (AOC) is a fiber-optic cable assembly with optical transceivers permanently embedded in both ends. It converts the traditional two-step connection\u2014pluggable module + fiber patch cable\u2014into a single, factory-terminated, plug-and-play assembly. Each end of […]<\/p>\n","protected":false},"author":2,"featured_media":886,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13],"tags":[],"class_list":["post-883","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-faq-guides"],"yoast_head":"\nActive Optical Cable (AOC): Core Interconnect for AI Clusters & Data Centers Guide- owire<\/title>\n<meta name=\"description\" content=\"Full technical guide to AOC working principle, AOC & DAC comparison, speed evolution, specification selection, deployment tips and 1.6T\/LPO\/CPO trends for hyperscale data centers, HPC and AI GPU clusters.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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