{"id":17604,"date":"2025-07-16T08:33:25","date_gmt":"2025-07-16T08:33:25","guid":{"rendered":"https:\/\/www.fibermall.com\/blog\/?p=17604"},"modified":"2025-08-13T06:23:24","modified_gmt":"2025-08-13T06:23:24","slug":"comprehensive-guide-to-100g-bidi-qsfp28-simplex-lc-smf-transceivers","status":"publish","type":"post","link":"https:\/\/www.fibermall.com\/blog\/guide-to-100g-bidi-qsfp28.htm","title":{"rendered":"Comprehensive Guide to 100G BIDI QSFP28 Simplex LC SMF Transceivers"},"content":{"rendered":"\n<p>The demand for high-speed, cost-effective, and fiber-efficient optical transceivers has surged with the growth of data centers, telecommunications, and 5G networks. The 100G BIDI QSFP28 (Bidirectional Quad Small Form-Factor Pluggable 28) transceiver is a standout solution, enabling 100 Gigabit Ethernet (100GbE) over a single-mode fiber (SMF) with a simplex LC connector. By using bidirectional transmission, it reduces fiber usage by 50% compared to traditional duplex systems.<\/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\/guide-to-100g-bidi-qsfp28.htm\/#What_is_a_100G_BIDI_QSFP28_Transceiver\" >What is a 100G BIDI QSFP28 Transceiver?<\/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\/guide-to-100g-bidi-qsfp28.htm\/#Key_Features_of_100G_BIDI_QSFP28_Transceivers\" >Key Features of 100G BIDI QSFP28 Transceivers<\/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\/guide-to-100g-bidi-qsfp28.htm\/#Forward_Error_Correction_FEC_in_100G_BIDI_QSFP28\" >Forward Error Correction (FEC) in 100G BIDI QSFP28<\/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\/guide-to-100g-bidi-qsfp28.htm\/#FEC_Recommendations_and_Best_Practices\" >FEC Recommendations and Best Practices<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.fibermall.com\/blog\/guide-to-100g-bidi-qsfp28.htm\/#Transmission_Distances_and_Applications\" >Transmission Distances and Applications<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.fibermall.com\/blog\/guide-to-100g-bidi-qsfp28.htm\/#Technical_Insights_How_100G_BIDI_QSFP28_Works\" >Technical Insights: How 100G BIDI QSFP28 Works<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.fibermall.com\/blog\/guide-to-100g-bidi-qsfp28.htm\/#Benefits_of_100G_BIDI_QSFP28_Transceivers\" >Benefits of 100G BIDI QSFP28 Transceivers<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.fibermall.com\/blog\/guide-to-100g-bidi-qsfp28.htm\/#Applications_of_100G_BIDI_QSFP28_Transceivers\" >Applications of 100G BIDI QSFP28 Transceivers<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.fibermall.com\/blog\/guide-to-100g-bidi-qsfp28.htm\/#Conclusion\" >Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\" id=\"h-what-is-a-100g-bidi-qsfp28-transceiver\"><span class=\"ez-toc-section\" id=\"What_is_a_100G_BIDI_QSFP28_Transceiver\"><\/span><strong>What is a 100G BIDI QSFP28 Transceiver?<\/strong><strong><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The 100G BIDI QSFP28 is a high-performance optical transceiver designed for 100 Gigabit Ethernet (100GbE) applications. Unlike traditional transceivers that require two fibers (one for transmitting and one for receiving), the 100G BIDI QSFP28 uses bidirectional technology to transmit and receive data over a single SMF strand using different wavelengths. This is achieved through Wavelength Division Multiplexing (WDM), typically operating at wavelengths such as 1271nm\/1331nm, 1291nm\/1311nm, or 1304nm\/1309nm, depending on the module and distance requirements.&nbsp;The use of a simplex LC connector makes the 100G BIDI QSFP28 highly efficient, as it reduces fiber infrastructure costs by up to 50% compared to duplex LC systems. This is particularly valuable in environments with limited fiber resources, such as data centers, metro networks, and 5G fronthaul applications. The transceiver complies with the QSFP28 Multi-Source Agreement (MSA), IEEE 802.3bm, and ITU-T standards, ensuring compatibility with major vendors like Cisco, Juniper, and Arista. It also supports digital diagnostic monitoring (DDM) for real-time performance tracking and integrates Forward Error Correction (FEC) for reliable data transmission, particularly over longer distances.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2025\/07\/Q28-100G32W-BX80-1.jpg\" alt=\"Q28-100G32W-BX80 (1)\" class=\"wp-image-17634\" style=\"width:800px\" width=\"800\" srcset=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2025\/07\/Q28-100G32W-BX80-1.jpg 934w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2025\/07\/Q28-100G32W-BX80-1-300x201.jpg 300w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2025\/07\/Q28-100G32W-BX80-1-768x514.jpg 768w\" sizes=\"(max-width: 934px) 100vw, 934px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-key-features-of-100g-bidi-qsfp28-transceivers\"><span class=\"ez-toc-section\" id=\"Key_Features_of_100G_BIDI_QSFP28_Transceivers\"><\/span><strong>Key Features of 100G BIDI QSFP28 Transceivers<\/strong><strong><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The 100G BIDI QSFP28 offers a range of features that make it ideal for high-speed, long-distance applications:<\/p>\n\n\n\n<p>Bidirectional Transmission: Utilizes a single SMF strand for both upstream and downstream data, doubling fiber capacity.<\/p>\n\n\n\n<p>Simplex LC Connector: Simplifies cabling and reduces infrastructure costs.<\/p>\n\n\n\n<p>High Data Rate: Supports 100Gbps Ethernet with line rates of 103.125Gbps (or 111.81Gbps for OTU4 in some modules).<\/p>\n\n\n\n<p>Multiple Reach Options: Available for distances of 10km, 20km, 30km, 40km, 70km, and 80km, catering to various network requirements.<\/p>\n\n\n\n<p>Low Power Consumption: Typically consumes less than 4.5W\u20136.5W, depending on the model and distance.<\/p>\n\n\n\n<p>Forward Error Correction (FEC): Many modules, especially for longer reaches, require FEC (e.g., KR4 or RS (544,514)) to ensure signal integrity.<\/p>\n\n\n\n<p>Wavelength Flexibility: Operates on specific wavelength pairs (e.g., 1271nm\/1331nm for 10km, 1304nm\/1309nm for 40km) to support bidirectional communication.<\/p>\n\n\n\n<p>Wide Compatibility: Compliant with IEEE 802.3bm, ITU-T G.959.1, and QSFP28 MSA standards, ensuring interoperability with major vendors like Cisco, Juniper, and Arista.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2025\/07\/Q28-100G32W-BX80-3.jpg\" alt=\"Q28-100G32W-BX80 (3)\" class=\"wp-image-17635\" style=\"width:800px\" width=\"800\" srcset=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2025\/07\/Q28-100G32W-BX80-3.jpg 964w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2025\/07\/Q28-100G32W-BX80-3-300x201.jpg 300w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2025\/07\/Q28-100G32W-BX80-3-768x515.jpg 768w\" sizes=\"(max-width: 964px) 100vw, 964px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-forward-error-correction-fec-in-100g-bidi-qsfp28\"><span class=\"ez-toc-section\" id=\"Forward_Error_Correction_FEC_in_100G_BIDI_QSFP28\"><\/span><strong>Forward Error Correction (FEC) in 100G BIDI QSFP28<\/strong><strong><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Forward Error Correction (FEC) is a critical feature in high-speed optical transceivers like the 100G BIDI QSFP28, as it corrects bit errors caused by signal degradation over long distances or in noisy environments. FEC adds redundant data to the transmitted signal, allowing the receiver to detect and correct errors without retransmission. In 100G BIDI QSFP28 modules, FEC requirements vary by transmission distance due to differences in optical budget, signal-to-noise ratio, and modulation formats (e.g., NRZ for shorter reaches, PAM4 for longer reaches). Below, we detail FEC requirements for each distance.<\/p>\n\n\n\n<p>The following table summarizes FEC requirements and recommendations for 100G BIDI QSFP28 transceivers across different distances:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>Distance<\/td><td>Module Type<\/td><td>FEC Requirement<\/td><td>Recommendation<\/td><\/tr><tr><td>10km<\/td><td>PAM4<\/td><td>Not mandatory, recommended<\/td><td>Enable RS-FEC for enhanced stability, especially in complex fiber environments.<\/td><\/tr><tr><td>20km<\/td><td>PAM4<\/td><td>Recommended, mandatory for PAM4<\/td><td>Enable RS-FEC to ensure performance, particularly with PAM4 modulation.<\/td><\/tr><tr><td>30km<\/td><td>PAM4<\/td><td>Typically required, mandatory for PAM4<\/td><td>Enable RS-FEC to maintain signal integrity.<\/td><\/tr><tr><td>40km<\/td><td>PAM4<\/td><td>Mandatory<\/td><td>Enable RS-FEC for reliable 40km transmission.<\/td><\/tr><tr><td>70km<\/td><td>LWDM4<\/td><td>Mandatory<\/td><td>Enable RS-FEC to support ultra-long-haul links.<\/td><\/tr><tr><td>80km<\/td><td>LWDM4<\/td><td>Mandatory<\/td><td>Enable RS-FEC to ensure error-free transmission.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2025\/07\/Q28-100G94-BX40-1.jpg\" alt=\"Q28-100G94-BX40 (1)\" class=\"wp-image-17636\" style=\"width:800px\" width=\"800\" srcset=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2025\/07\/Q28-100G94-BX40-1.jpg 1000w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2025\/07\/Q28-100G94-BX40-1-300x189.jpg 300w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2025\/07\/Q28-100G94-BX40-1-768x484.jpg 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-fec-recommendations-and-best-practices\"><span class=\"ez-toc-section\" id=\"FEC_Recommendations_and_Best_Practices\"><\/span><strong>FEC Recommendations and Best Practices<\/strong><strong><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Short Distances (10km, 20km): Prioritize enabling FEC to ensure stability, especially for PAM4 modules or in environments with high dispersion or noise. RS-FEC enhances link reliability without significant overhead.<\/p>\n\n\n\n<p>Medium to Long Distances (30km and above): FEC is mandatory due to increased signal degradation. Switches must support RS-FEC to achieve the specified reach.<\/p>\n\n\n\n<p>Compatibility Verification: Check the module\u2019s data sheet (FiberMall) and switch firmware to confirm support for required FEC and modulation formats (NRZ or PAM4).<\/p>\n\n\n\n<p>Deployment Testing: Use optical power meters and DDM data to verify link performance and assess FEC effectiveness in real-world conditions.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-transmission-distances-and-applications\"><span class=\"ez-toc-section\" id=\"Transmission_Distances_and_Applications\"><\/span><strong>Transmission Distances and Applications<\/strong><strong><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The 100G BIDI QSFP28 is available in multiple variants to support different transmission distances, each tailored to specific use cases. Below, we explore the specifications and applications for each distance:<\/p>\n\n\n\n<ol class=\"wp-block-list\" type=\"1\">\n<li>10km: <a href=\"https:\/\/www.fibermall.com\/sale-459327-100g-bidi-qsfp28-1331nm-10km.htm\" target=\"_blank\" rel=\"noreferrer noopener\">100G BIDI QSFP28 <\/a>10km<\/li>\n<\/ol>\n\n\n\n<p>Wavelengths: Typically 1271nm\/1331nm.<\/p>\n\n\n\n<p>Optical Budget: Approximately 6\u20138 dB.<\/p>\n\n\n\n<p>FEC Requirement: Optional, depending on the host platform.<\/p>\n\n\n\n<p>Applications: Ideal for short-reach data center interconnects, enterprise networks, and campus backbones. The 10km 100G BIDI QSFP28 is perfect for environments where fiber resources are limited but high-speed connectivity is essential.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>20km: 100G BIDI QSFP28 <\/li>\n<\/ul>\n\n\n\n<p>Wavelengths: Commonly 1291nm\/1311nm or 1280nm\/1310nm.<\/p>\n\n\n\n<p>Optical Budget: Around 10\u201312 dB.<\/p>\n\n\n\n<p>FEC Requirement: Typically requires RS FEC for stable performance.<\/p>\n\n\n\n<p>Applications: Suited for metro networks, 5G fronthaul, and regional data center interconnects. The 20km 100G BIDI QSFP28 supports longer intra-city links while maintaining cost efficiency.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>30km: 100G BIDI QSFP28 <\/li>\n<\/ul>\n\n\n\n<p>Wavelengths: Often 1304nm\/1309nm.<\/p>\n\n\n\n<p>Optical Budget: Approximately 13\u201314.7 dB (OMA).<\/p>\n\n\n\n<p>FEC Requirement: Requires RS (544,514) FEC for full reach; without FEC, the distance may be limited.<\/p>\n\n\n\n<p>Applications: Used in long-haul data center interconnects, enterprise networks, and telecom applications. The 30km 100G BIDI QSFP28 is designed for scenarios requiring robust performance over extended distances.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2025\/07\/Q28-100G49-BX40-4.jpg\" alt=\"Q28-100G49-BX40 (4)\" class=\"wp-image-17637\" style=\"width:800px\" width=\"800\" srcset=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2025\/07\/Q28-100G49-BX40-4.jpg 998w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2025\/07\/Q28-100G49-BX40-4-300x193.jpg 300w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2025\/07\/Q28-100G49-BX40-4-768x493.jpg 768w\" sizes=\"(max-width: 998px) 100vw, 998px\" \/><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li>40km: 100G BIDI QSFP28 40km<\/li>\n<\/ul>\n\n\n\n<p>Wavelengths: Typically 1304.58nm\/1309.14nm.<\/p>\n\n\n\n<p>Optical Budget: Around 17.6\u201318.5 dB.<\/p>\n\n\n\n<p>FEC Requirement: Requires KR4 or RS FEC for full 40km reach; without FEC, the reach is approximately 30km.<\/p>\n\n\n\n<p>Applications: Ideal for long-reach metro networks, regional data centers, and high-capacity enterprise backbones. The 40km 100G BIDI QSFP28 is a cost-effective solution for extended single-fiber connectivity.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<div class=\"ast-oembed-container \" style=\"height: 100%;\"><iframe title=\"100G QSFP28 BIDI 40KM Transceiver: High-Speed Connectivity | FiberMall\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/WrkhhIsAcps?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<\/div><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li>70km: 100G BIDI QSFP28 70km<\/li>\n<\/ul>\n\n\n\n<p>Wavelengths: Typically 1295.56nm\/1300.05nm or 1304.58nm\/1309.14nm.<\/p>\n\n\n\n<p>Optical Budget: Approximately 20\u201324 dB.<\/p>\n\n\n\n<p>FEC Requirement: Requires KR4 FEC for stable performance.<\/p>\n\n\n\n<p>Applications: Designed for ultra-long-haul applications, such as regional telecom networks and inter-data center connectivity. The 70km 100G BIDI QSFP28 supports high-capacity links in fiber-scarce environments.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>80km: 100G BIDI QSFP28 80km<\/li>\n<\/ul>\n\n\n\n<p>Wavelengths: Often 1273nm\/1310nm or 1295.56nm\/1309.14nm.<\/p>\n\n\n\n<p>Optical Budget: Up to 24 dB.<\/p>\n\n\n\n<p>FEC Requirement: Requires KR4 FEC for full reach; some modules use SOA+PIN receivers for enhanced sensitivity.<\/p>\n\n\n\n<p>Applications: Suited for long-haul telecom networks, hyperscale data centers, and service provider backbones. The 80km 100G BIDI QSFP28 is the ultimate solution for maximizing fiber efficiency over vast distances.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<div class=\"ast-oembed-container \" style=\"height: 100%;\"><iframe title=\"100G QSFP28 BIDI 80KM Transceiver: Long Distance over Simplex Single Fiber | FiberMall\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/cBckIOCq-mA?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-technical-insights-how-100g-bidi-qsfp28-works\"><span class=\"ez-toc-section\" id=\"Technical_Insights_How_100G_BIDI_QSFP28_Works\"><\/span><strong>Technical Insights: How 100G BIDI QSFP28 Works<\/strong><strong><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The 100G BIDI QSFP28 leverages advanced optical technologies to achieve bidirectional transmission. Here\u2019s a breakdown of its working principles:<\/p>\n\n\n\n<p>WDM Technology: The transceiver uses WDM to transmit and receive signals on different wavelengths over a single fiber. For example, a 10km module might transmit at 1271nm and receive at 1331nm, while a 40km module uses 1304.58nm\/1309.14nm.<\/p>\n\n\n\n<p>PAM4 vs. NRZ Modulation: For longer distances (e.g., 30km and above), many 100G BIDI QSFP28 modules use PAM4 (Pulse Amplitude Modulation 4-level) to achieve higher data rates within a single optical channel. Shorter distances (10km, 20km) may use NRZ (Non-Return-to-Zero) for compatibility with legacy switches.<\/p>\n\n\n\n<p>EML and PIN Receivers: High-performance Electro-absorption Modulated Lasers (EML) are used for transmission, while PIN photodiodes or SOA+PIN receivers ensure high sensitivity for long-distance applications.<\/p>\n\n\n\n<p>FEC Integration: Forward Error Correction (FEC) is critical for longer reaches (30km\u201380km) to correct signal errors and ensure reliable data transmission.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2025\/07\/100G-BIDI-QSFP28-2.jpg\" alt=\"100G BIDI QSFP28\" class=\"wp-image-17639\" style=\"width:800px\" width=\"800\" srcset=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2025\/07\/100G-BIDI-QSFP28-2.jpg 900w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2025\/07\/100G-BIDI-QSFP28-2-300x200.jpg 300w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2025\/07\/100G-BIDI-QSFP28-2-768x512.jpg 768w\" sizes=\"(max-width: 900px) 100vw, 900px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-benefits-of-100g-bidi-qsfp28-transceivers\"><span class=\"ez-toc-section\" id=\"Benefits_of_100G_BIDI_QSFP28_Transceivers\"><\/span><strong>Benefits of 100G BIDI QSFP28 Transceivers<\/strong><strong><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The 100G QSFP28 BIDI offers significant advantages for modern networks:<\/p>\n\n\n\n<p>Fiber Efficiency: By using a single fiber for bidirectional communication, it reduces cabling costs and maximizes existing infrastructure.<\/p>\n\n\n\n<p>Cost Savings: Eliminates the need for additional fiber strands, lowering deployment and maintenance expenses.<\/p>\n\n\n\n<p>Scalability: Supports high-density deployments in data centers and telecom networks, allowing operators to scale bandwidth without extensive infrastructure upgrades.<\/p>\n\n\n\n<p>Versatility: Available for multiple distances (10km to 80km), making it suitable for diverse applications from short-reach data centers to long-haul telecom.<\/p>\n\n\n\n<p>Interoperability: Compatible with major vendors\u2019&nbsp;equipment, ensuring seamless integration into existing networks.<\/p>\n\n\n\n<p>Energy Efficiency: Low power consumption (typically &lt;5W for shorter reaches, &lt;6.5W for 80km) supports green data center initiatives.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-applications-of-100g-bidi-qsfp28-transceivers\"><span class=\"ez-toc-section\" id=\"Applications_of_100G_BIDI_QSFP28_Transceivers\"><\/span><strong>Applications of 100G BIDI QSFP28 Transceivers<\/strong><strong><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The 100G QSFP28 BIDI is deployed across various industries and scenarios:<\/p>\n\n\n\n<p>Data Centers: Facilitates high-speed interconnects between servers, switches, and routers, especially in hyperscale environments with limited fiber availability.<\/p>\n\n\n\n<p>Metro Networks: Supports intra-city connectivity for enterprises and service providers, offering cost-effective solutions for 20km\u201340km links.<\/p>\n\n\n\n<p>5G Fronthaul: Meets the high-bandwidth, low-latency requirements of 5G networks, particularly for 10km\u201330km fronthaul links.<\/p>\n\n\n\n<p>Telecom Networks: Enables long-haul connectivity (70km\u201380km) for regional and national backbone networks.<\/p>\n\n\n\n<p>Enterprise Networks: Provides high-capacity links for campus and corporate networks, supporting digital transformation initiatives.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-conclusion\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span><strong>Conclusion<\/strong><strong><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The 100G BIDI QSFP28 Simplex LC SMF transceiver is a revolutionary solution for high-speed, fiber-efficient networking. Supporting distances from 10km to 80km, it caters to data centers, metro networks, 5G fronthaul, and long-haul telecom. FEC requirements range from optional (10km) to mandatory (30km\u201380km), ensuring reliable performance. By leveraging bidirectional WDM, the 100G BIDI QSFP28 optimizes fiber usage, reduces costs, and supports scalable networks.<\/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\/arista-cable.htm\" class=\"lwrp-list-link\"><span class=\"lwrp-list-link-title-text\">Everything You Need to Know About Arista Networks&#8217; Compatible Cable Solutions<\/span><\/a><\/li><li class=\"lwrp-list-item\"><a href=\"https:\/\/www.fibermall.com\/blog\/understanding-qsfp-cables.htm\" class=\"lwrp-list-link\"><span class=\"lwrp-list-link-title-text\">Understanding QSFP Cables: A Comprehensive Guide to 40G Direct Attach Options<\/span><\/a><\/li><li class=\"lwrp-list-item\"><a href=\"https:\/\/www.fibermall.com\/blog\/difference-between-smartnic-and-nic.htm\" class=\"lwrp-list-link\"><span class=\"lwrp-list-link-title-text\">What is the Difference Between SmartNIC and NIC?<\/span><\/a><\/li><li class=\"lwrp-list-item\"><a href=\"https:\/\/www.fibermall.com\/blog\/optical-interconnection-computing-networks.htm\" class=\"lwrp-list-link\"><span class=\"lwrp-list-link-title-text\">Optical Interconnection in High Performance Computing Networks<\/span><\/a><\/li><li class=\"lwrp-list-item\"><a href=\"https:\/\/www.fibermall.com\/blog\/800g-in-data-center-pam4-or-coherent.htm\" class=\"lwrp-list-link\"><span class=\"lwrp-list-link-title-text\">800G in Data Center: PAM4 or Coherent?<\/span><\/a><\/li>                <\/ul>\r\n                        <\/div>\r\n<\/div>","protected":false},"excerpt":{"rendered":"<p>The demand for high-speed, cost-effective, and fiber-efficient optical transceivers has surged with the growth of data centers, telecommunications, and 5G networks. The 100G BIDI QSFP28 (Bidirectional Quad Small Form-Factor Pluggable 28) transceiver is a standout solution, enabling 100 Gigabit Ethernet (100GbE) over a single-mode fiber (SMF) with a simplex LC connector. By using bidirectional transmission, [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":17850,"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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Xue","type":"person","thumbnail_url":"https:\/\/media.licdn.com\/dms\/image\/C5603AQErPqKD0j6qBg\/profile-displayphoto-shrink_100_100\/0\/1599138392315?e=1723075200&v=beta&t=joEkh1OeKQ0F-QpAPv4xxQyBdGlHyccIQZauRSs6RvU","share_type":"default"}],"_wpsp_enable_custom_social_template":false,"_wpsp_social_scheduling":{"enabled":false,"datetime":null,"platforms":[],"status":"template_only","dateOption":"today","timeOption":"now","customDays":"","customHours":"","customDate":"","customTime":"","schedulingType":"absolute"},"_wpsp_active_default_template":true},"categories":[2,30],"tags":[],"class_list":["post-17604","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-fiber-optic-transceivers"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v20.13 (Yoast SEO v25.8) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Comprehensive Guide to 100G BIDI QSFP28 Transceivers | FiberMall<\/title>\n<meta name=\"description\" content=\"The 100G BIDI QSFP28 is a high-performance optical transceiver designed for 100 Gigabit Ethernet (100GbE) 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\/guide-to-100g-bidi-qsfp28.htm\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Comprehensive Guide to 100G BIDI QSFP28 Simplex LC SMF Transceivers\" \/>\n<meta property=\"og:description\" content=\"The demand for high-speed, cost-effective, and fiber-efficient optical transceivers has surged with the growth of data centers, telecommunications, and 5G\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.fibermall.com\/blog\/guide-to-100g-bidi-qsfp28.htm\" \/>\n<meta property=\"og:site_name\" content=\"fibermall.com\" 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