{"id":4189,"date":"2026-02-07T15:05:46","date_gmt":"2026-02-07T07:05:46","guid":{"rendered":"https:\/\/laserdiode-ld.com\/?p=4189"},"modified":"2026-01-26T13:21:29","modified_gmt":"2026-01-26T05:21:29","slug":"recepteur-optique-couple-a-une-fibre-1550nm-et-led-pigtailed-engineering-design","status":"publish","type":"post","link":"https:\/\/laserdiode-ld.com\/fr\/recepteur-optique-couple-a-une-fibre-1550nm-et-led-pigtailed-engineering-design-html","title":{"rendered":"Conception technique d'un r\u00e9cepteur optique coupl\u00e9 \u00e0 une fibre de 1550 nm et d'une DEL en queue de cochon"},"content":{"rendered":"

La fen\u00eatre de t\u00e9l\u00e9communications 1550nm : Fondements physiques de la transmission \u00e0 faible perte<\/h2>\n\n\n\n

In the spectral landscape of photonics, the 1550nm wavelength represents the “Golden Window” for long-range and high-precision optical systems. This preference is not arbitrary; it is dictated by the fundamental physical properties of silica-based glass. Within the Fibre 1550nm<\/strong> l'att\u00e9nuation atteint son minimum th\u00e9orique, environ 0,2 dB\/km, principalement en raison de l'\u00e9quilibre entre la diffusion de Rayleigh, qui diminue avec la quatri\u00e8me puissance de la longueur d'onde, et l'absorption des infrarouges due aux vibrations mol\u00e9culaires.<\/p>\n\n\n\n

Pour les ing\u00e9nieurs qui d\u00e9veloppent du mat\u00e9riel de d\u00e9tection ou de communication avanc\u00e9, la transition de longueurs d'onde plus courtes (telles que 850 nm ou 1310 nm) \u00e0 des longueurs d'onde plus courtes (telles que 850 nm ou 1310 nm) est un d\u00e9fi majeur. Fibre de 1550 nm<\/a><\/strong> systems is driven by more than just low loss. At 1550nm, the light is “eye-safe” at significantly higher power levels compared to the visible spectrum because the ocular fluid absorbs the energy before it can reach the retina. This allows for higher-power emission in LIDAR and remote sensing applications. However, the move to 1550nm necessitates a complete shift in material science, moving from Silicon-based detectors to Indium Gallium Arsenide (InGaAs) for the r\u00e9cepteur optique coupl\u00e9 \u00e0 une fibre<\/a><\/strong>, et des alliages semi-conducteurs ternaires ou quaternaires complexes pour les sources lumineuses.<\/p>\n\n\n

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

Physique de la d\u00e9tection : Le r\u00e9cepteur optique coupl\u00e9 \u00e0 une fibre<\/h2>\n\n\n\n

Le c\u0153ur de tout syst\u00e8me de r\u00e9cup\u00e9ration du signal dans la bande C est le syst\u00e8me de r\u00e9cup\u00e9ration du signal. r\u00e9cepteur optique coupl\u00e9 \u00e0 une fibre<\/strong>. Contrairement aux d\u00e9tecteurs optiques, un module coupl\u00e9 \u00e0 une fibre doit interfacer efficacement le c\u0153ur de moins de 10 microm\u00e8tres d'une fibre monomode avec une zone active semi-conductrice. C'est \u00e0 cette interface que se posent les probl\u00e8mes les plus importants en mati\u00e8re de rapport signal-bruit (RSB).<\/p>\n\n\n\n

Efficacit\u00e9 quantique et r\u00e9activit\u00e9 dans l'InGaAs<\/h3>\n\n\n\n

Le m\u00e9canisme de d\u00e9tection d'une photodiode PIN InGaAs repose sur l'effet photo\u00e9lectrique interne. Lorsqu'un photon d'\u00e9nergie $E = h\\nu$ frappe la r\u00e9gion intrins\u00e8que du semi-conducteur, il doit avoir suffisamment d'\u00e9nergie pour franchir la bande interdite $E_g$. Pour l'InGaAs, cette bande interdite est con\u00e7ue pour \u00eatre d'environ 0,75 eV, ce qui le rend tr\u00e8s sensible \u00e0 la plage de 1,0 \u00e0 1,7 microm\u00e8tre.<\/p>\n\n\n\n

La sensibilit\u00e9 $R$ du r\u00e9cepteur est une mesure critique, d\u00e9finie comme suit :<\/p>\n\n\n\n

$$R = \\frac{\\eta q}{h \\nu} = \\frac{\\eta \\lambda}{1.24}$$<\/p>\n\n\n\n

O\u00f9 $\\eta$ est l'efficacit\u00e9 quantique, $q$ est la charge \u00e9lectronique et $\\lambda$ est la longueur d'onde en microm\u00e8tres. Dans un r\u00e9cepteur optique coupl\u00e9 \u00e0 une fibre de haute qualit\u00e9, l'efficacit\u00e9 quantique d\u00e9passe souvent 80%, ce qui conduit \u00e0 des valeurs de r\u00e9activit\u00e9 sup\u00e9rieures \u00e0 0,9 A\/W \u00e0 1550 nm. Toutefois, une r\u00e9activit\u00e9 \u00e9lev\u00e9e ne sert \u00e0 rien si le bruit de fond est trop important.<\/p>\n\n\n\n

L'impact du courant d'obscurit\u00e9 et de la capacit\u00e9 parasite<\/h3>\n\n\n\n

From a component quality perspective, the “Dark Current” ($I_d$) is the primary enemy of precision. This is the residual current that flows through the receiver even in total darkness. Dark current is a function of the semiconductor growth quality; defects in the InGaAs lattice create intermediate energy states that facilitate thermal generation of carriers.<\/p>\n\n\n\n

Furthermore, the “Active Area” size of the receiver presents a trade-off. A larger active area (e.g., 500 micrometers) makes fiber alignment easier but increases the parasitic capacitance. High capacitance acts as a low-pass filter, severely limiting the bandwidth of the system. In high-speed 1550 nm fiber systems, engineers must select receivers with the smallest possible active area that can still reliably capture the fiber’s divergent output, typically necessitating precision aspheric lenses inside the receiver package.<\/p>\n\n\n\n

Principes d'\u00e9mission : L'ing\u00e9nierie de la LED \u00e0 fibre optique en queue de cochon<\/h2>\n\n\n\n

Alors que les diodes laser offrent une puissance et une coh\u00e9rence \u00e9lev\u00e9es, les fibre pigtailed led<\/a><\/strong> reste indispensable pour les applications n\u00e9cessitant une faible coh\u00e9rence temporelle et une grande stabilit\u00e9, telles que la tomographie par coh\u00e9rence optique (OCT) ou certains types de gyroscopes \u00e0 fibre optique.<\/p>\n\n\n\n

Le d\u00e9fi Etendue dans le couplage des LED<\/h3>\n\n\n\n

Le principal obstacle technique \u00e0 la mise en place d'un fibre pigtailed led<\/strong> is the “Etendue” or the conservation of the “area-solid angle product.” LEDs are Lambertian emitters, meaning they emit light over a wide 180-degree hemisphere. Coupling this diffuse light into a single-mode Fibre 1550nm<\/a><\/strong> avec une ouverture num\u00e9rique (NA) d'environ 0,14 est intrins\u00e8quement inefficace.<\/p>\n\n\n\n

To overcome this, manufacturers employ “Edge-Emitting LED” (ELED) or “Superluminescent LED” (SLED) architectures. Unlike standard surface-emitting LEDs, an ELED confines the light to a narrow junction layer, similar to a diode laser<\/a> mais sans les miroirs de r\u00e9troaction optique. Il en r\u00e9sulte un faisceau plus directionnel qui peut \u00eatre captur\u00e9 par des micro-optiques et lanc\u00e9 dans la queue de cochon en fibre. La qualit\u00e9 du fibre pigtailed led<\/strong> is thus judged by its “Coupled Power” rather than its total luminous flux.<\/p>\n\n\n\n

Largeur spectrale et dispersion chromatique<\/h3>\n\n\n\n

L'un des avantages de la fibre pigtailed led<\/strong> at 1550nm is its broad spectral width (typically 30nm to 100nm). In sensing applications, this broad spectrum reduces “speckle noise” and interference artifacts. However, in the context of Fibre de 1550 nm<\/strong> transmission, this breadth leads to significant chromatic dispersion. Different wavelengths within the LED’s spectrum travel at different speeds through the fiber, causing pulse broadening. For this reason, pigtailed LEDs are favored for short-to-medium range sensing rather than long-haul telecommunications.<\/p>\n\n\n\n

From Component Quality to Total System Cost: The “Reliability-First” Perspective<\/h2>\n\n\n\n

Lors de l'achat de composants tels qu'un r\u00e9cepteur optique coupl\u00e9 \u00e0 une fibre<\/strong> ou un fibre pigtailed led<\/strong>, buyers often focus on the “Price per mW” or “Price per unit.” However, in industrial and medical fields, the true cost is determined by the “Cost of Failure.”<\/p>\n\n\n\n

A low-quality fiber-coupled module often utilizes epoxy-based alignment. Over time, thermal cycling causes the epoxy to expand and contract, leading to “alignment drift.” A shift of just 2 micrometers in the fiber position relative to the detector can result in a 3dB (50%) loss in signal. If this occurs in a buried infrastructure sensor or a surgical laser system, the cost of repair or recalibration far exceeds the initial savings of the component.<\/p>\n\n\n\n

By contrast, professional-grade modules utilize laser-welded “butterfly” or “TO-can” packages. Laser welding creates a permanent, inorganic bond that is immune to outgassing and moisture ingress. This ensures that the Fibre 1550nm<\/strong> reste stable au fil des d\u00e9cennies.<\/p>\n\n\n\n

\u00c9tude de cas : D\u00e9tection de m\u00e9thane \u00e0 haute sensibilit\u00e9 dans les raffineries industrielles<\/h2>\n\n\n\n

Historique de la client\u00e8le :<\/p>\n\n\n\n

Un fabricant de syst\u00e8mes de s\u00e9curit\u00e9 pour les gaz industriels avait besoin d'une solution de t\u00e9l\u00e9d\u00e9tection pour d\u00e9tecter les fuites de m\u00e9thane \u00e0 une distance de 2 kilom\u00e8tres en utilisant l'infrastructure existante de fibre optique de 1550 nm.<\/p>\n\n\n\n

D\u00e9fis techniques :<\/p>\n\n\n\n

Methane has a specific absorption line near 1650nm, but the system used the 1550nm “side-band” for reference. The challenge was the extremely low return signal from the remote gas cell. The system required:<\/p>\n\n\n\n

    \n
  • A r\u00e9cepteur optique coupl\u00e9 \u00e0 une fibre<\/strong> avec une puissance \u00e9quivalente au bruit (NEP) ultra-faible pour d\u00e9tecter des signaux de l'ordre du picowatt.<\/li>\n\n\n\n
  • A fibre pigtailed led<\/strong> with high spectral stability to ensure the reference signal didn’t drift and mimic a gas absorption peak.<\/li>\n\n\n\n
  • Perte de retour optique (ORL) minimale pour \u00e9viter les signaux fant\u00f4mes dans la boucle de fibre.<\/li>\n<\/ul>\n\n\n\n

    Param\u00e8tres techniques et configuration :<\/strong><\/p>\n\n\n\n

      \n
    • Source :<\/strong> SLED (LED superluminescente) 1550nm pigtailed to G.652.D single-mode fiber (fibre monomode G.652.D).<\/li>\n\n\n\n
    • R\u00e9cepteur :<\/strong> R\u00e9cepteur int\u00e9gr\u00e9 PIN-TIA (amplificateur \u00e0 transimp\u00e9dance) InGaAs.<\/li>\n\n\n\n
    • NEP :<\/strong> $5 \\times 10^{-15} \\text{ W\/Hz}^{1\/2}$.<\/li>\n\n\n\n
    • Accouplement :<\/strong> Alignement actif par station robotique \u00e0 6 axes, fixation par soudage au laser Nd:YAG.<\/li>\n<\/ul>\n\n\n\n

      Solution de contr\u00f4le de la qualit\u00e9 (QC) :<\/p>\n\n\n\n

      Every fiber-coupled optical receiver was subjected to a “Dark Current vs. Temperature” sweep from -20\u00b0C to +70\u00b0C. Modules showing exponential dark current growth\u2014indicative of lattice impurities\u2014were rejected. The pigtailed LEDs underwent a 168-hour “Accelerated Aging” test at maximum rated current to stabilize the spectral output.<\/p>\n\n\n\n

      Conclusion :<\/p>\n\n\n\n

      En utilisant un r\u00e9cepteur optique coupl\u00e9 \u00e0 une fibre \u00e0 haute r\u00e9activit\u00e9 et \u00e0 faible bruit, le client a pu atteindre une limite de d\u00e9tection de 50 ppm (parties par million) pour le m\u00e9thane sur un parcours de fibre de 2 km. L'utilisation de pigtails soud\u00e9s au laser a permis au syst\u00e8me de ne n\u00e9cessiter aucun recalibrage au cours de ses deux premi\u00e8res ann\u00e9es de d\u00e9ploiement en ext\u00e9rieur dans l'environnement volatile d'une raffinerie.<\/p>\n\n\n\n

      Comparaison technique : technologies de r\u00e9ception \u00e0 1550nm<\/h2>\n\n\n\n

      Le tableau suivant pr\u00e9sente les diff\u00e9rences de performance entre les composants standard et les composants haute performance des r\u00e9cepteurs utilis\u00e9s dans les syst\u00e8mes de gestion de l'information. Fibre de 1550 nm<\/strong> des syst\u00e8mes d'alimentation en eau.<\/p>\n\n\n\n

      Sp\u00e9cification<\/strong><\/td>PIN standard InGaAs<\/strong><\/td>PIN-TIA \u00e0 grande vitesse<\/strong><\/td>Photodiode \u00e0 avalanche (APD)<\/strong><\/td><\/tr><\/thead>
      Gamme spectrale<\/strong><\/td>1100 – 1700 nm<\/td>1100 – 1650 nm<\/td>1260 – 1620 nm<\/td><\/tr>
      R\u00e9activit\u00e9<\/strong><\/td>0.85 – 0.95 A\/W<\/td>0,90 A\/W<\/td>8 – 10 A\/W (M=10)<\/td><\/tr>
      Courant noir<\/strong><\/td>0.5 – 2.0 nA<\/td>1.0 – 5.0 nA<\/td>10 – 50 nA<\/td><\/tr>
      Largeur de bande<\/strong><\/td>100 – 500 MHz<\/td>1 – 10 GHz<\/td>1 – 2.5 GHz<\/td><\/tr>
      NEP (typique)<\/strong><\/td>$10^{-14} \\text{ W\/Hz}^{1\/2}$<\/td>$10^{-13} \\text{ W\/Hz}^{1\/2}$<\/td>$10^{-15} \\text{ W\/Hz}^{1\/2}$<\/td><\/tr>
      Type d'accouplement<\/strong><\/td>Fibre Pigtail<\/td>Fibre Pigtail<\/td>R\u00e9ceptacle \/ queue de cochon<\/td><\/tr>
      Application typique<\/strong><\/td>Surveillance de l'alimentation<\/td>Communication de donn\u00e9es<\/td>LIDAR \u00e0 longue port\u00e9e<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

      FAQ professionnelle : Composants optiques 1550nm<\/h2>\n\n\n\n

      Q1 : Pourquoi l'InGaAs est-il utilis\u00e9 \u00e0 la place du silicium pour les r\u00e9cepteurs \u00e0 1550 nm ?<\/p>\n\n\n\n

      Le silicium a une bande interdite d'environ 1,1 eV, ce qui signifie qu'il ne peut absorber que des photons de longueur d'onde inf\u00e9rieure \u00e0 1100 nm. \u00c0 1550 nm, le silicium est transparent. L'InGaAs a une bande interdite plus basse (environ 0,75 eV), ce qui lui permet de convertir efficacement les photons de 1550 nm en \u00e9lectrons.<\/p>\n\n\n\n

      Q2: What is the difference between a “pigtailed” and a “receptacle” module?<\/p>\n\n\n\n

      Une led ou un r\u00e9cepteur \u00e0 fibre pigtailed poss\u00e8de une longueur de fibre optique attach\u00e9e de fa\u00e7on permanente et align\u00e9e sur la puce interne. Cela permet d'obtenir la perte d'insertion la plus faible et la stabilit\u00e9 la plus \u00e9lev\u00e9e. Un module r\u00e9ceptacle a un connecteur (comme LC ou FC) int\u00e9gr\u00e9 dans le bo\u00eetier, permettant \u00e0 l'utilisateur de brancher son propre c\u00e2ble, ce qui offre plus de flexibilit\u00e9 mais un potentiel plus \u00e9lev\u00e9 de contamination et de perte.<\/p>\n\n\n\n

      Q3 : Comment la temp\u00e9rature affecte-t-elle un r\u00e9cepteur \u00e0 fibre optique de 1550 nm ?<\/p>\n\n\n\n

      As temperature increases, the thermal energy allows more electrons to jump the bandgap without light stimulus, increasing the “Dark Current.” This effectively raises the noise floor of the system. High-performance fiber-coupled optical receivers often include an internal thermistor to monitor this effect or a TEC to stabilize the temperature.<\/p>\n\n\n\n

      Q4 : Un cordon de fibre optique peut-il \u00eatre utilis\u00e9 pour la transmission de donn\u00e9es \u00e0 haut d\u00e9bit ?<\/p>\n\n\n\n

      Uniquement \u00e0 des vitesses relativement faibles (typiquement <622 Mbps). Comme les LED ont une large largeur spectrale, la dispersion chromatique dans la fibre de 1550 nm entra\u00eene un \u00e9talement du signal sur de longues distances. Pour les donn\u00e9es \u00e0 grande vitesse ou sur de longues distances, une diode laser (LD) est n\u00e9cessaire en raison de sa largeur de ligne \u00e9troite.<\/p>\n\n\n\n

      Q5: What is the significance of the “PIN” in PIN photodiode?<\/p>\n\n\n\n

      PIN stands for P-type, Intrinsic, N-type. The “Intrinsic” layer is a wide, undoped region between the P and N layers. This increases the volume where photons can be absorbed and reduces the junction capacitance, allowing for both higher sensitivity and faster response times compared to a standard PN junction.<\/p>","protected":false},"excerpt":{"rendered":"

      The 1550nm Telecommunications Window: Physical Foundations of Low-Loss Transmission In the spectral landscape of photonics, the 1550nm wavelength represents the “Golden Window” for long-range and high-precision optical systems. This preference is not arbitrary; it is dictated by the fundamental physical properties of silica-based glass. Within the 1550nm fiber ecosystem, the attenuation reaches its theoretical minimum, […]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"themepark_post_bcolor":"#f5f5f5","themepark_post_width":"1022px","themepark_post_img":"","themepark_post_img_po":"left","themepark_post_img_re":false,"themepark_post_img_cover":false,"themepark_post_img_fixed":false,"themepark_post_hide_title":false,"themepark_post_main_b":"","themepark_post_main_p":100,"themepark_paddingblock":false,"footnotes":"","_wpscp_schedule_draft_date":"","_wpscp_schedule_republish_date":"","_wpscppro_advance_schedule":false,"_wpscppro_advance_schedule_date":"","_wpscppro_dont_share_socialmedia":false,"_wpscppro_custom_social_share_image":0,"_facebook_share_type":"","_twitter_share_type":"","_linkedin_share_type":"","_pinterest_share_type":"","_linkedin_share_type_page":"","_instagram_share_type":"","_medium_share_type":"","_threads_share_type":"","_google_business_share_type":"","_selected_social_profile":[],"_wpsp_enable_custom_social_template":false,"_wpsp_social_scheduling":{"enabled":true,"datetime":"2026-02-07 07:05:46","platforms":[],"status":"pending_publication","dateOption":"today","timeOption":"now","customDays":"","customHours":"","customDate":"","customTime":"","schedulingType":"absolute"},"_wpsp_active_default_template":true},"categories":[1],"tags":[],"class_list":["post-4189","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"metadata":{"_edit_lock":["1768460813:1"],"wpil_sync_report3":["1"],"wpil_links_inbound_internal_count":["0"],"wpil_links_inbound_internal_count_data":["eJxLtDKwqq4FAAZPAf4="],"wpil_links_outbound_internal_count":["5"],"wpil_links_outbound_internal_count_data":["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"],"wpil_links_outbound_external_count":["0"],"wpil_links_outbound_external_count_data":["eJxLtDKwqq4FAAZPAf4="],"wpil_sync_report2_time":["2026-01-15T07:06:35+00:00"],"_edit_last":["1"],"_aioseo_title":["1550nm Fiber Coupled Optical Receiver & Pigtailed LED Guide"],"_aioseo_description":["Technical analysis of 1550nm fiber coupled optical receivers and pigtailed LEDs for sensing. 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