{"id":6454,"date":"2023-11-08T17:49:00","date_gmt":"2023-11-08T17:49:00","guid":{"rendered":"https:\/\/www.fibermall.com\/blog\/?p=6454"},"modified":"2023-11-23T09:02:04","modified_gmt":"2023-11-23T09:02:04","slug":"what-are-the-differences-between-eml-and-dml-laser","status":"publish","type":"post","link":"https:\/\/www.fibermall.com\/blog\/what-are-the-differences-between-eml-and-dml-laser.htm","title":{"rendered":"What are the Differences between EML and DML Laser?"},"content":{"rendered":"\n<p>Both EML (Electro-Absorption-Modulated Laser) and DML (Directly Modulated Laser) lasers play important roles in optical transceiver and are used in optical communications and other optoelectronic applications. Let\u2019s take a look at what\u2019s the difference between them.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_76 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.fibermall.com\/blog\/what-are-the-differences-between-eml-and-dml-laser.htm\/#What_are_EML_and_DML_Lasers\" >What are EML and DML Lasers?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.fibermall.com\/blog\/what-are-the-differences-between-eml-and-dml-laser.htm\/#How_to_Distinguish_and_Choose_EML_and_DML_Lasers\" >How to Distinguish and Choose EML and DML Lasers<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.fibermall.com\/blog\/what-are-the-differences-between-eml-and-dml-laser.htm\/#Summary\" >Summary<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.fibermall.com\/blog\/what-are-the-differences-between-eml-and-dml-laser.htm\/#Related_Posts\" >Related Posts<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\" id=\"h-what-are-eml-and-dml-lasers\"><span class=\"ez-toc-section\" id=\"What_are_EML_and_DML_Lasers\"><\/span>What are EML and DML Lasers?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>EML laser is external modulated laser or electro-absorption-modulated laser, whose working principle is based on the photoelectric effect. It modulates the amplitude and phase of laser light by applying a voltage to a semiconductor material, thereby achieving high-speed light modulation. EML lasers have the advantages of high speed, high efficiency, and low noise, and are widely used in optical fiber communications, optical imaging, optical sensing and other fields.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/11\/EML-laser-1024x576.jpg\" alt=\"EML laser\" class=\"wp-image-6459\" style=\"width:537px;height:302px\" width=\"537\" height=\"302\" srcset=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/11\/EML-laser-1024x576.jpg 1024w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/11\/EML-laser-300x169.jpg 300w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/11\/EML-laser-768x432.jpg 768w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/11\/EML-laser-1536x864.jpg 1536w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/11\/EML-laser.jpg 1920w\" sizes=\"(max-width: 537px) 100vw, 537px\" \/><\/figure>\n\n\n\n<p class=\"has-text-align-center\"><strong>EML laser<\/strong><\/p>\n\n\n\n<p>DML laser is directly modulated laser, whose working principle is to modulate the amplitude and phase of the laser based on the change of carrier concentration in the semiconductor material. By directly modulating the laser, rapid control and adjustment of the laser can be achieved. DML lasers have the advantages of low cost, low power consumption, and easy integration, and are widely used in optical fiber communications, optical computing, optical sensing and other fields.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img decoding=\"async\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/11\/DML-laser-1024x480.jpg\" alt=\"DML laser\" class=\"wp-image-6460\" style=\"width:537px;height:252px\" width=\"537\" height=\"252\" srcset=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/11\/DML-laser-1024x480.jpg 1024w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/11\/DML-laser-300x141.jpg 300w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/11\/DML-laser-768x360.jpg 768w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/11\/DML-laser-1536x720.jpg 1536w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/11\/DML-laser.jpg 1920w\" sizes=\"(max-width: 537px) 100vw, 537px\" \/><\/figure>\n\n\n\n<p class=\"has-text-align-center\"><strong>DML laser<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-how-to-distinguish-and-choose-eml-and-dml-lasers\"><span class=\"ez-toc-section\" id=\"How_to_Distinguish_and_Choose_EML_and_DML_Lasers\"><\/span>How to Distinguish and Choose EML and DML Lasers<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Learn about the factors that determine laser type:<\/strong><\/li>\n<\/ul>\n\n\n\n<p>The difference between EML and DML lasers mainly lies in their working mechanism and spectral range. EML lasers typically use external modulators to generate laser, which can operate over a wider frequency range at higher speeds. DML lasers use direct modulators to generate laser, and they typically operate at lower frequencies but with higher power.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Understand the spectral range of lasers:<\/strong><\/li>\n<\/ul>\n\n\n\n<p>An EML laser is a laser that achieves feedback through a grating or other structure. It typically works over a wider spectral range, such as 1550-1650nm, while DML lasers usually work within a narrow range, such as 1550nm.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Understand the working speed of a laser:<\/strong><\/li>\n<\/ul>\n\n\n\n<p>EML lasers can operate at higher rates, such as 10 Gbps, due to the use of external modulators, while DML lasers operate at lower rates such as 1Gbps due to the use of direct modulators.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img decoding=\"async\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/11\/Speed-and-Reaches-of-EML-and-DML-1024x576.jpg\" alt=\"Speed and Reaches of EML and DML Lasers\" class=\"wp-image-6461\" style=\"width:539px;height:304px\" width=\"539\" height=\"304\" srcset=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/11\/Speed-and-Reaches-of-EML-and-DML-1024x576.jpg 1024w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/11\/Speed-and-Reaches-of-EML-and-DML-300x169.jpg 300w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/11\/Speed-and-Reaches-of-EML-and-DML-768x432.jpg 768w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/11\/Speed-and-Reaches-of-EML-and-DML-1536x864.jpg 1536w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/11\/Speed-and-Reaches-of-EML-and-DML.jpg 1920w\" sizes=\"(max-width: 539px) 100vw, 539px\" \/><\/figure>\n\n\n\n<p class=\"has-text-align-center\"><strong>Speed and Reaches of EML and DML Lasers<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Understand the Application Scenarios of Lasers:<\/strong><\/li>\n<\/ul>\n\n\n\n<p>As the light source of DWDM (Dense Wavelength Division Multiplexing) system, EML laser can emit stable and narrow spectral lines, enabling it to transmit a large amount of data stream and achieve high-speed optical communication. The tunability of EML allows the flexible selection of different wavelengths in optical communication systems, thereby increasing fiber utilization and data transmission efficiency.<\/p>\n\n\n\n<p>DML lasers are typically used for shorter distance optical communication transmission. Although its output spectrum line is relatively wide, it still has advantages in some low-speed data transmission and short-distance communications.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-summary\"><span class=\"ez-toc-section\" id=\"Summary\"><\/span>Summary<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>To sum up, to distinguish and select EML and DML lasers, factors such as laser type, spectral range, operating rate and power need to be considered. Only with a thorough understanding of these factors can we select the most suitable laser type for the application.<\/p>\n<style>\r\n\r\n        .lwrp.link-whisper-related-posts{\r\n            \r\n            margin-top: 40px;\nmargin-bottom: 30px;\r\n        }\r\n        .lwrp .lwrp-title{\r\n            \r\n            \r\n        }\r\n        .lwrp .lwrp-description{\r\n            \r\n            \r\n\r\n        }\r\n        .lwrp .lwrp-list-container{\r\n        }\r\n        .lwrp .lwrp-list-multi-container{\r\n            display: flex;\r\n        }\r\n        .lwrp .lwrp-list-double{\r\n            width: 48%;\r\n        }\r\n        .lwrp .lwrp-list-triple{\r\n            width: 32%;\r\n        }\r\n        .lwrp .lwrp-list-row-container{\r\n            display: flex;\r\n            justify-content: space-between;\r\n        }\r\n        .lwrp .lwrp-list-row-container .lwrp-list-item{\r\n            width: calc(100% - 20px);\r\n        }\r\n        .lwrp .lwrp-list-item:not(.lwrp-no-posts-message-item){\r\n            \r\n            list-style: decimal;\r\n        }\r\n        .lwrp .lwrp-list-item img{\r\n            max-width: 100%;\r\n            height: auto;\r\n        }\r\n        .lwrp .lwrp-list-item.lwrp-empty-list-item{\r\n            background: initial !important;\r\n        }\r\n        .lwrp .lwrp-list-item .lwrp-list-link .lwrp-list-link-title-text,\r\n        .lwrp .lwrp-list-item .lwrp-list-no-posts-message{\r\n            \r\n                \r\n        }\r\n        @media screen and (max-width: 480px) {\r\n            .lwrp.link-whisper-related-posts{\r\n                \r\n                \r\n            }\r\n            .lwrp .lwrp-title{\r\n                \r\n                \r\n            }\r\n            .lwrp .lwrp-description{\r\n                \r\n                \r\n            }\r\n            .lwrp .lwrp-list-multi-container{\r\n                flex-direction: column;\r\n            }\r\n            .lwrp .lwrp-list-multi-container ul.lwrp-list{\r\n                margin-top: 0px;\r\n                margin-bottom: 0px;\r\n                padding-top: 0px;\r\n                padding-bottom: 0px;\r\n            }\r\n            .lwrp .lwrp-list-double,\r\n            .lwrp .lwrp-list-triple{\r\n                width: 100%;\r\n            }\r\n            .lwrp .lwrp-list-row-container{\r\n                justify-content: initial;\r\n                flex-direction: column;\r\n            }\r\n            .lwrp .lwrp-list-row-container .lwrp-list-item{\r\n                width: 100%;\r\n            }\r\n            .lwrp .lwrp-list-item:not(.lwrp-no-posts-message-item){\r\n                \r\n                \r\n            }\r\n            .lwrp .lwrp-list-item .lwrp-list-link .lwrp-list-link-title-text,\r\n            .lwrp .lwrp-list-item .lwrp-list-no-posts-message{\r\n                \r\n                    \r\n            }\r\n        }<\/style>\r\n<div id=\"link-whisper-related-posts-widget\" class=\"link-whisper-related-posts lwrp\">\r\n            <h3 class=\"lwrp-title\">Related Posts<\/h3>    \r\n        <div class=\"lwrp-list-container\">\r\n                                            <ul class=\"lwrp-list lwrp-list-single\">\r\n                    <li class=\"lwrp-list-item\"><a href=\"https:\/\/www.fibermall.com\/blog\/remove-dsp-in-lpo-optical-module.htm\" class=\"lwrp-list-link\"><span class=\"lwrp-list-link-title-text\">Why Is It Necessary to Remove the DSP Chip in LPO Optical Module Links?\u00a0<\/span><\/a><\/li><li class=\"lwrp-list-item\"><a href=\"https:\/\/www.fibermall.com\/blog\/demand-trend-for-data-center-optical-transceiver.htm\" class=\"lwrp-list-link\"><span class=\"lwrp-list-link-title-text\">Market Demand and Trend for the Data Center Optical Transceiver<\/span><\/a><\/li><li class=\"lwrp-list-item\"><a href=\"https:\/\/www.fibermall.com\/blog\/200g-optical-transceiver-overview.htm\" class=\"lwrp-list-link\"><span class=\"lwrp-list-link-title-text\">200G Optical Transceiver Overview: QSFP56 vs. QSFP-DD<\/span><\/a><\/li><li class=\"lwrp-list-item\"><a href=\"https:\/\/www.fibermall.com\/questions\/max-power-consumption-of-400g-osfp-qsfp-dd.htm\" class=\"lwrp-list-link\"><span class=\"lwrp-list-link-title-text\">What is the Maximum Power Consumption of 400G OSFP and QSFP-DD Transceivers?<\/span><\/a><\/li><li class=\"lwrp-list-item\"><a href=\"https:\/\/www.fibermall.com\/blog\/major-difference-between-router-adn-layer-3-switch.htm\" class=\"lwrp-list-link\"><span class=\"lwrp-list-link-title-text\">Key Differences Between Layer 3 Switch vs Router: Understanding the Essentials<\/span><\/a><\/li>                <\/ul>\r\n                        <\/div>\r\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Both EML (Electro-Absorption-Modulated Laser) and DML (Directly Modulated Laser) lasers play important roles in optical transceiver and are used in optical communications and other optoelectronic applications. Let\u2019s take a look at what\u2019s the difference between them. What are EML and DML Lasers? EML laser is external modulated laser or electro-absorption-modulated laser, whose working principle is [&hellip;]<\/p>\n","protected":false},"author":227,"featured_media":6461,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center 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This site is optimized with the Yoast SEO Premium plugin v20.13 (Yoast SEO v25.8) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What are the Differences between EML and DML Laser? | FiberMall<\/title>\n<meta name=\"description\" content=\"EML and DML lasers play important roles in optical transceiver and are used in optical communications and other optoelectronic applications.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.fibermall.com\/blog\/what-are-the-differences-between-eml-and-dml-laser.htm\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What are the Differences between EML and DML Laser?\" \/>\n<meta property=\"og:description\" content=\"Both EML (Electro-Absorption-Modulated Laser) and DML (Directly Modulated Laser) lasers play important roles 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