{"id":5404,"date":"2026-05-14T01:42:53","date_gmt":"2026-05-14T01:42:53","guid":{"rendered":"https:\/\/lp.szlogic.cn\/knowledge-center\/100g-cwdm4-transceiver-efficient-2km-links\/"},"modified":"2026-05-25T09:13:41","modified_gmt":"2026-05-25T09:13:41","slug":"100g-cwdm4-transceiver-efficient-2km-links","status":"publish","type":"post","link":"https:\/\/lp.szlogic.cn\/ru\/knowledge-center\/100g-cwdm4-transceiver-efficient-2km-links","title":{"rendered":"The Ultimate Guide to 100G CWDM4 Optical Transceivers: Powering Efficient 2km Links"},"content":{"rendered":"<figure class=\"wp-block-image aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1200\" height=\"712\" src=\"https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/399a4813f35e44f1b8d94329c2d95052.webp\" alt=\"100G CWDM4 Transceiver\" class=\"wp-image-5402\" srcset=\"https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/399a4813f35e44f1b8d94329c2d95052.webp 1200w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/399a4813f35e44f1b8d94329c2d95052-300x178.webp 300w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/399a4813f35e44f1b8d94329c2d95052-1024x608.webp 1024w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/399a4813f35e44f1b8d94329c2d95052-768x456.webp 768w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/399a4813f35e44f1b8d94329c2d95052-18x12.webp 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/products\/472577.htm\"><strong>100G CWDM4 optical transceivers<\/strong><\/a> are the industry-standard solution for cost-effective, high-performance 100 Gigabit Ethernet connections over distances up to 2 kilometers. Utilizing <strong>Coarse Wavelength Division Multiplexing <\/strong><a target=\"_blank\" rel=\"\" href=\"https:\/\/resources.l-p.com\/glossary\/what-is-cwdm-understanding-coarse-wavelength-division-multiplexing\"><strong>(CWDM)<\/strong><\/a> technology over duplex <strong>single-mode fiber <\/strong><a target=\"_blank\" rel=\"\" href=\"https:\/\/resources.l-p.com\/knowledge-center\/what-is-single-mode-fiber-and-how-does-it-work\"><strong>(SMF)<\/strong><\/a>, they offer significant advantages in data center interconnects (DCI), enterprise networking, and service provider networks. This guide dives deep into how they work, their key benefits, and why choosing a reliable brand like <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/page\/aboutus.htm\"><strong>LINK-PP<\/strong><\/a> matters for your optical infrastructure.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The relentless demand for bandwidth in modern data centers and networks necessitates robust, scalable, and cost-efficient connectivity solutions. Enter the <strong>100G CWDM4 (100G QSFP28 CWDM4)<\/strong> optical transceiver module \u2013 a cornerstone technology for 100Gbps links spanning up to 2km. Let&#8217;s explore why it&#8217;s become such a popular choice.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>&#x2705; Understanding 100G CWDM4 Technology<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Unlike parallel optics solutions requiring multiple fibers (like SR4), <strong>CWDM4<\/strong> leverages <strong>wavelength division multiplexing <\/strong><a target=\"_blank\" rel=\"\" href=\"https:\/\/resources.l-p.com\/knowledge-center\/cwdm-vs-dwdm-vs-mwdm-vs-lwdm-vs-swdm-differences\"><strong>(WDM)<\/strong><\/a>. It combines four distinct 25Gbps optical lanes onto just two strands of single-mode fiber (one for transmit, one for receive). This is achieved using four CWDM wavelengths within the O-band:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p style=\"margin: 0px;\"><strong>Lane 1:<\/strong> 1271nm<\/p><\/li><li><p style=\"margin: 0px;\"><strong>Lane 2:<\/strong> 1291nm<\/p><\/li><li><p style=\"margin: 0px;\"><strong>Lane 3:<\/strong> 1311nm<\/p><\/li><li><p style=\"margin: 0px;\"><strong>Lane 4:<\/strong> 1331nm<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A <strong>multiplexer (Mux)<\/strong> combines these signals at the transmitter end, and a <strong>demultiplexer (Demux)<\/strong> separates them at the receiver end. This efficient use of fiber infrastructure drastically reduces cabling complexity and cost compared to multi-fiber solutions, especially in dense environments.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>&#x2705; Key Applications of 100G CWDM4 Modules<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p style=\"margin: 0px;\"><strong>Data Center Interconnects (DCI):<\/strong> Connecting servers, top-of-rack (ToR) switches, and aggregation switches within and between data center buildings or campuses (within the 2km range).<\/p><\/li><li><p style=\"margin: 0px;\"><strong>Enterprise Backbone Networks:<\/strong> High-speed links between core switches and routers in large enterprise networks.<\/p><\/li><li><p style=\"margin: 0px;\"><strong>Telecom &amp; Service Provider Networks:<\/strong> Providing 100G client interfaces for metro access and edge applications.<\/p><\/li><li><p style=\"margin: 0px;\"><strong>Network Function Virtualization (NFV) &amp; Storage Area Networks (SAN):<\/strong> Supporting high-bandwidth virtualized services and storage connectivity.<\/p><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>&#x2705; Major Advantages of Choosing 100G CWDM4 Transceiver<\/strong><\/h2>\n\n\n\n<ol class=\"wp-block-list\" >\n<li><p style=\"margin: 0px;\"><strong>Cost Efficiency (Capex &amp; Opex):<\/strong> Reduces fiber strand count by 75% compared to SR4 (8 fibers vs 2 fibers), lowering cable costs, patch panel ports, and management overhead. Lower power consumption than some alternatives also reduces OpEx.<\/p><\/li><li><p style=\"margin: 0px;\"><strong>Simplified Fiber Management:<\/strong> Duplex LC connectors are smaller, easier to manage, and require less space than MPO connectors used in parallel optics. This is crucial in high-density environments.<\/p><\/li><li><p style=\"margin: 0px;\"><strong>Standardized Interoperability:<\/strong> The CWDM4 <a target=\"_blank\" href=\"https:\/\/resources.l-p.com\/knowledge-center\/multi-source-agreements-optical-transceivers\"><strong>MSA<\/strong><\/a><strong> (Multi-Source Agreement)<\/strong> ensures modules from different vendors (like <strong>LINK-PP<\/strong>, Finisar, Intel, etc.) interoperate seamlessly when connected to compliant Mux\/Demux units.<\/p><\/li><li><p style=\"margin: 0px;\"><strong>Proven Reliability &amp; Performance:<\/strong> A mature technology offering stable, high-performance 100G connectivity up to 2km with low <strong>bit error rates <\/strong><a target=\"_blank\" rel=\"\" href=\"https:\/\/resources.l-p.com\/glossary\/understanding-what-is-bit-error-rate\"><strong>(BER)<\/strong><\/a>.<\/p><\/li><li><p style=\"margin: 0px;\"><strong>Scalability:<\/strong> Facilitates easier network upgrades and expansions due to simplified fiber infrastructure.<\/p><\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>&#x2705; CWDM4 vs. PSM4: Choosing the Right 2km 100G Solution<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Both <strong>CWDM4 and PSM4<\/strong> target the 2km 100G duplex SMF market. Here&#8217;s a quick comparison:<\/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;\"\/><col style=\"min-width: 25px;\"\/><\/colgroup><tbody><tr><th colspan=\"1\" rowspan=\"1\"><p><strong>Feature<\/strong><\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p><strong>100G CWDM4 (QSFP28)<\/strong><\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p><strong>100G PSM4 (QSFP28)<\/strong><\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p><strong>Technology<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>CWDM (4 wavelengths)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Parallel Single Mode (4 identical \u03bb ~1310nm)<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p><strong>Fiber Type<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p><strong>SMF (2 fibers)<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p><strong>SMF (4 fibers)<\/strong> (Requires MPO-12 connector)<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p><strong>Wavelengths<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>1271, 1291, 1311, 1331nm<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>4x ~1310 nm<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p><strong>Key Advantage<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p><strong>Minimal Fiber Count (2)<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Simpler Optics (No WDM Mux\/Demux needed <em>at ends<\/em>)<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p><strong>Key Disadvantage<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Requires WDM Mux\/Demux in path<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p><strong>Higher Fiber Count (4)<\/strong><\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p><strong>Best Suited For<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p><strong>Maximizing fiber efficiency<\/strong>, DCI, new builds<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Short SMF runs where fiber is abundant, direct point-to-point links without external Mux\/Demux<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Generally, CWDM4 is preferred for its superior fiber savings,<\/strong> while PSM4 might be chosen for very simple, direct links where avoiding external Mux\/Demux units is a priority (though needing 4 fibers).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>&#x2705; Why Quality &amp; Compatibility Matter: The LINK-PP Advantage<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img decoding=\"async\" width=\"1200\" height=\"712\" src=\"https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/a1e502803bbc4cd58da53b9188a63d44.webp\" alt=\"100G QSFP28 CWDM4 Transceiver\" class=\"wp-image-5403\" srcset=\"https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/a1e502803bbc4cd58da53b9188a63d44.webp 1200w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/a1e502803bbc4cd58da53b9188a63d44-300x178.webp 300w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/a1e502803bbc4cd58da53b9188a63d44-1024x608.webp 1024w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/a1e502803bbc4cd58da53b9188a63d44-768x456.webp 768w, https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/a1e502803bbc4cd58da53b9188a63d44-18x12.webp 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Not all transceivers are created equal. Using high-quality, <strong>MSA-compliant<\/strong> modules is essential for network stability, performance, and longevity. <strong>LINK-PP<\/strong> manufactures rigorously tested <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/products\/472577.htm\"><strong>100G QSFP28 CWDM4 modules<\/strong><\/a> that ensure:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p style=\"margin: 0px;\"><strong>Full MSA Compliance:<\/strong> Guaranteed interoperability with major switch\/router brands (Cisco, Juniper, Arista, Mellanox\/NVIDIA, etc.).<\/p><\/li><li><p style=\"margin: 0px;\"><strong>Exceptional Performance:<\/strong> Low power consumption (&lt; 3.5W typical), excellent sensitivity, and compliance with IEEE 802.3bm standards for reliable 100GBASE-LR4 performance over 2km SMF.<\/p><\/li><li><p style=\"margin: 0px;\"><strong>Stringent Quality Control:<\/strong> Each module undergoes extensive testing for optical power, receiver sensitivity, and BER.<\/p><\/li><li><p style=\"margin: 0px;\"><strong>Cost Savings:<\/strong> <strong>LINK-PP<\/strong> offers high-reliability optics at competitive prices, providing an excellent alternative to often overpriced OEM modules without sacrificing quality.<\/p><\/li><li><p style=\"margin: 0px;\"><strong>Comprehensive Support:<\/strong> Backed by technical expertise and reliable warranties.<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>&#x1f4a1; Pro Tip:<\/strong> Ensure compatibility by checking your switch\/router&#8217;s supported transceiver list (often called an MSA or Optics Compatibility Matrix). <strong>LINK-PP<\/strong> provides compatibility information for its modules, like the popular <strong>LINK-PP <\/strong><a target=\"_self\" href=\"https:\/\/www.l-p.com\/products\/472577.htm\"><strong>LQ-CW100-FR4C<\/strong><\/a> model.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Ready to Simplify Your 100G 2km Links?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>100G CWDM4 optical transceiver<\/strong> remains a dominant and highly effective solution for 100 Gigabit Ethernet connectivity within data centers and up to 2km. Its combination of <strong>performance, fiber efficiency, cost savings, and standardization<\/strong> makes it an incredibly compelling choice.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Optimize your network infrastructure today! Explore LINK-PP&#8217;s range of high-quality, compatible 100G CWDM4 transceivers, including the reliable LQ-CW100-FR4C model. <\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>&#x1f449;&#x1f3fb; <\/strong><a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/file\/datasheet\/lq-cw100-fr4c.pdf\"><strong>Technical Datasheet (PDF)<\/strong><\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>&#x1f449;&#x1f3fb; <\/strong><a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/message-472577.htm\"><strong>Request a Quote<\/strong><\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>&#x2705; Frequently Asked Questions (FAQs)<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p style=\"margin: 0px;\"><strong>Q: What is the maximum distance for 100G CWDM4?<\/strong><br\/><strong>A:<\/strong> The standard specifies operation up to <strong>2 kilometers<\/strong> over G.652.D single-mode fiber.<\/p><\/li><li><p style=\"margin: 0px;\"><strong>Q: Do I need special filters or Mux\/Demux for CWDM4?<\/strong><br\/><strong>A: Yes.<\/strong> CWDM4 transceivers require passive CWDM Mux and Demux units installed in the fiber path between the two endpoints to combine and separate the wavelengths. These are separate passive components.<\/p><\/li><li><p style=\"margin: 0px;\"><strong>Q: Can CWDM4 modules work with BiDi technology?<\/strong><br\/><strong>A:<\/strong> No. Standard CWDM4 uses two fibers (Tx and Rx). 100G BiDi solutions (like QSFP28 BiDi) exist but use different wavelengths on a <em>single<\/em> fiber pair for potentially longer reaches (e.g., 10km, 20km, 40km).<\/p><\/li><li><p style=\"margin: 0px;\"><strong>Q: Is CWDM4 hot-pluggable?<\/strong><br\/><strong>A:<\/strong> Yes, like most QSFP28 modules, CWDM4 transceivers are designed for hot-pluggability, allowing installation and removal without powering down the host equipment.<\/p><\/li><li><p style=\"margin: 0px;\"><strong>Q: Why choose LINK-PP CWDM4 modules?<\/strong><br\/><strong>A: LINK-PP<\/strong> offers <strong>MSA-compliant, high-performance, reliable 100G CWDM4 optics<\/strong> backed by quality assurance and significant cost savings compared to OEM options, making them an intelligent choice for scaling your optical network.<\/p><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>See Also<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><a target=\"_blank\" rel=\"\" href=\"https:\/\/resources.l-p.com\/knowledge-center\/100g-qsfp28-optical-transceivers-selection-guide\">Explore 100G QSFP28 Optical Transceivers: SR4, LR4, CWDM4, PSM4 &amp; More<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a target=\"_blank\" rel=\"\" href=\"https:\/\/resources.l-p.com\/knowledge-center\/psm4-vs-cwdm4-which-optical-transceiver-for-your-network\">PSM4 vs.\u00a0CWDM4: What is the differences?<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a target=\"_blank\" rel=\"\" href=\"https:\/\/resources.l-p.com\/knowledge-center\/100g-single-lambda-vs-4-channel-optical-modules-comparison\">100G Single Lambda vs 4 Wavelength Optical Modules Key Differences<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a target=\"_blank\" rel=\"\" href=\"https:\/\/resources.l-p.com\/knowledge-center\/100g-optical-transceiver-form-factors-guide\">100G Optical Transceivers Form Factors: QSFP28, CFP, CFP2, CFP4?<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>QSFP28 100G CWDM4 transceiver is the industry-standard solution for cost-effective, high-performance 100 Gigabit Ethernet connections over distances up to 2km <\/p>","protected":false},"author":1,"featured_media":5402,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[13],"class_list":["post-5404","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knowledge-center","tag-100g-modules"],"blocksy_meta":[],"acf":[],"_links":{"self":[{"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/posts\/5404","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/comments?post=5404"}],"version-history":[{"count":2,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/posts\/5404\/revisions"}],"predecessor-version":[{"id":7576,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/posts\/5404\/revisions\/7576"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/media\/5402"}],"wp:attachment":[{"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/media?parent=5404"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/categories?post=5404"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lp.szlogic.cn\/ru\/wp-json\/wp\/v2\/tags?post=5404"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}