{"id":11598,"date":"2026-01-06T17:13:13","date_gmt":"2026-01-06T09:13:13","guid":{"rendered":"https:\/\/ascentoptics.com\/blog\/?p=11598"},"modified":"2026-04-29T17:57:12","modified_gmt":"2026-04-29T09:57:12","slug":"100g-qsfp28-bidi-optical-module-features-benefits-and-use-cases","status":"publish","type":"post","link":"https:\/\/ascentoptics.com\/blog\/100g-qsfp28-bidi-optical-module-features-benefits-and-use-cases\/","title":{"rendered":"100G QSFP28 BiDi Optical Module: Features, Benefits, and Use Cases"},"content":{"rendered":"

As data centers and metro networks evolve toward 100G speeds, fiber resource constraints and rising cabling costs have become common challenges. The 100G QSFP28 BiDi optical module enables 100G high-speed interconnects via single-fiber bidirectional transmission without adding more fibers, making it an ideal solution that balances performance and cost. This article briefly introduces the key features and core advantages of 100G BiDi modules.<\/p>\n

 <\/p>\n

Introduction to 100G QSFP28 BiDi<\/strong><\/h2>\n

The 100G QSFP28 BiDi<\/a> optical module is a transceiver that supports 100Gbps rates with single-fiber bidirectional transmission. It uses the QSFP28 standard package and is designed for high-bandwidth interconnects under limited fiber resources.<\/p>\n

It employs WDM (Wavelength Division Multiplexing) technology to achieve full-duplex 100G communication by transmitting and receiving on different wavelengths over a single single-mode fiber (SMF). Compared to traditional dual-fiber solutions (e.g., 100G LR4\/ER4), it reduces fiber usage by half, significantly conserving fiber resources.<\/p>\n

These modules typically support transmission distances of 10 km, 20 km, or 40 km. They feature plug-and-play simplicity, easy deployment, and compatibility with mainstream switches and routers. They are widely used in data center interconnects (DCI), metro networks, and data center upgrades where fiber resources are constrained.<\/p>\n

 <\/p>\n

\"Introduction<\/p>\n

 <\/p>\n

 <\/p>\n

Features and Advantages of 100G BiDi Optical Modules<\/strong><\/h2>\n

The 100G QSFP28 BiDi optical module significantly improves fiber utilization while maintaining 100G bandwidth through single-fiber bidirectional transmission technology. It is widely used in data centers and metro networks. This article briefly introduces its core features and key advantages:<\/p>\n

 <\/p>\n

Key Features<\/strong><\/h3>\n

Single-Fiber Bidirectional 100G Transmission<\/strong><\/p>\n

BiDi modules perform both transmit and receive functions on a single single-mode fiber, achieving full-duplex 100G communication by separating upstream and downstream signals using different wavelengths (WDM). The interface is typically duplex LC (instead of traditional MPO multi-core).<\/p>\n

 <\/p>\n

Modulation Technology<\/strong><\/p>\n

Commonly uses PAM4<\/a> (4-level Pulse Amplitude Modulation) or NRZ, supporting per-channel rates of 50Gbps (2\u00d750G) or 4\u00d725G aggregated to 100G.<\/p>\n

 <\/p>\n

Support for Medium- and Short-Range Interconnects<\/strong><\/p>\n

Typical transmission distances include 10 km, 20 km, and 40 km, covering intra-data center interconnects and metro-level DCI requirements.<\/p>\n

 <\/p>\n

Compatibility<\/strong><\/p>\n

Compliant with QSFP28 MSA and IEEE 802.3 standards, deployable on mainstream switches, routers, and data center equipment. Supports hot-plug and digital diagnostic monitoring (DDM\/DOM) for real-time monitoring of temperature, power, and signal quality.<\/p>\n

 <\/p>\n

Plug-and-Play, Simplified Deployment<\/strong><\/p>\n

No external wavelength division devices (e.g., Mux\/DeMux) are required\u2014the module integrates WDM functionality internally, enabling fast deployment and easy scalability.<\/p>\n

 <\/p>\n

\"100G<\/p>\n

 <\/p>\n

Key Advantages<\/strong><\/h3>\n

Fiber Resource Savings<\/strong><\/p>\n

Compared to traditional dual-fiber modules (e.g., SR4 requiring 8-12 cores with MPO connectors), BiDi uses only half the fibers (single fiber or duplex LC), reducing fiber usage by 50% and significantly lowering cabling and infrastructure costs.<\/p>\n

 <\/p>\n

Reuse of Existing Cabling<\/strong><\/p>\n

Ideal for data center upgrades from 10G\/25G\/40G to 100G. It directly reuses existing duplex LC multimode or single-mode fiber infrastructure without the need to relayout cables or replace MPO jumpers, resulting in low upgrade costs and simple deployment.<\/p>\n

 <\/p>\n

High Cost-Effectiveness<\/strong><\/p>\n

In environments with scarce fiber resources (such as data center interconnects, metro networks, and 5G fronthaul\/backhaul), it delivers lower overall system costs while maintaining high-performance transmission.<\/p>\n

 <\/p>\n

High Utilization and Flexibility<\/strong><\/p>\n

Single-fiber transmission allows more 100G links within the same fiber resources, improving switch port utilization and overall rack density. It enhances fiber efficiency, supports high-density deployments, and is suitable for data centers, cloud computing, telecom backbone networks, and enterprise networks.<\/p>\n

 <\/p>\n

Flexible Deployment and Easy Maintenance<\/strong><\/p>\n

No complex optical layer planning or separate DWDM systems required, making it ideal for rapid deployment in enterprise data centers, metro networks, and cloud infrastructures.<\/p>\n

 <\/p>\n

In summary, the 100G BiDi optical module is an economical and efficient solution for data center and high-speed network upgrades. It is particularly effective in fiber-constrained environments, enabling significant bandwidth increases without major infrastructure overhauls.<\/p>\n

 <\/p>\n

 <\/p>\n

What Types of 100G QSFP28 BiDi Optical Modules Are Available?<\/strong><\/h2>\n

Main Types and Specifications<\/strong><\/h3>\n

Below are the common types of 100G QSFP28 BiDi optical modules, classified by transmission distance:<\/p>\n\n\n\n\n\n\n\n\n\n\n
Specification<\/b><\/strong><\/td>\nSR BiDi<\/strong><\/a><\/td>\nLR BiDi<\/strong><\/a><\/td>\nER BiDi<\/strong><\/a><\/td>\nZR BiDi<\/strong><\/a><\/td>\n<\/tr>\n
Typical Designation<\/strong><\/td>\n100GBASE-SR BiDi \/ SR1.2 BiDi \/ SWDM4 BiDi<\/td>\n100GBASE-LR BiDi \/ LR1 BiDi<\/td>\n100GBASE-ER BiDi \/ ER1 BiDi<\/td>\n100GBASE-ZR BiDi<\/td>\n<\/tr>\n
Transmission Distance<\/strong><\/td>\n70 m (OM3<\/a>)100 m (OM4)150 m (OM5)<\/td>\n10\u201320 km<\/td>\n30\u201340 km<\/td>\nUp to 80 km<\/td>\n<\/tr>\n
Fiber Type<\/strong><\/td>\nMultimode (MMF)<\/td>\nSingle-mode (SMF)<\/td>\nSingle-mode (SMF)<\/td>\nSingle-mode (SMF)<\/td>\n<\/tr>\n
Wavelength (Tx\/Rx)<\/strong><\/td>\n850\/910 nm or 850\u2013940 nm (multiple wavelengths)<\/td>\n1271\/1331 nm or 1291\/1311 nm<\/td>\n1304\/1309 nm<\/td>\nLAN-WDM multiple wavelengths<\/td>\n<\/tr>\n
Modulation Format<\/strong><\/td>\nPAM4 or NRZ<\/td>\nPAM4<\/td>\nPAM4<\/td>\nNRZ<\/td>\n<\/tr>\n
Connector Type<\/strong><\/td>\nDuplex LC<\/td>\nSimplex LC or Duplex LC<\/td>\nSimplex LC<\/td>\nSimplex LC<\/td>\n<\/tr>\n
Typical Applications<\/strong><\/td>\nIntra-rack and short-reach data center links;reuse existing 10G\/40G LC cabling<\/td>\nData center interconnect (DCI);metro networks<\/td>\nLong-haul backbone networks;telecom transmission<\/td>\nUltra-long-distance interconnects(less common)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

SR BiDi:<\/strong> The most common type, widely used for data center upgrades. It helps reduce fiber costs and supports hot-plug capability and DDM\/DOM monitoring.<\/p>\n

LR\/ER BiDi:<\/strong> Based on single-wavelength PAM4 technology with FEC support, suitable for scenarios requiring long-reach single-fiber transmission.<\/p>\n

Some models support industrial-grade operating temperatures (-40\u00b0C to 85\u00b0C).<\/p>\n

 <\/p>\n

Advantages Summary<\/strong><\/h3>\n

Fiber savings:<\/strong> Requires only half the fiber (single-fiber bidirectional transmission), ideal for fiber-constrained environments.<\/p>\n

High compatibility:<\/strong> Reuses existing duplex LC cabling, enabling smooth upgrades from 10G\/40G to 100G.<\/p>\n

Low power consumption:<\/strong> Typically 4\u20136 W, suitable for high-density deployments.<\/p>\n

Cost efficiency:<\/strong> Reduces cabling, deployment, and maintenance costs.<\/p>\n

 <\/p>\n

 <\/p>\n

100G QSFP28 BiDi Optical Module Selection Guide<\/strong><\/h2>\n

Choosing the right 100G QSFP28 BiDi transceiver requires careful consideration of transmission distance, existing fiber type, fiber resource availability, budget, and device compatibility. The following practical selection guide will help you make the best decision quickly.<\/p>\n

 <\/p>\n

\"100G<\/p>\n

 <\/p>\n

Transmission Distance<\/strong><\/h3>\n

The first factor to consider is the required transmission distance:<\/p>\n

    \n
  • <\/b>Short Reach (\u2264 70m over OM3 \/ \u2264 100m over OM4)<\/b><\/strong><\/li>\n<\/ul>\n

    \u2192 Standard 100G QSFP28 BiDi modules are ideal for most intra-data center connections.<\/p>\n

      \n
    • <\/b>Extended Reach Requirements<\/b><\/strong><\/li>\n<\/ul>\n

      \u2192 BiDi modules are primarily designed for short-range applications. For longer distances, consider alternatives such as 100G LR4 or CWDM4.<\/p>\n

      Tip<\/b><\/strong>: Always verify actual link distance including patch cords and cross-connects to avoid signal margin issues.<\/p>\n

       <\/p>\n

      Fiber Infrastructure<\/strong><\/h3>\n

      One of the biggest advantages of QSFP28 BiDi is fiber reuse:<\/p>\n

        \n
      • <\/b>Duplex LC Fiber (Existing 10G Infrastructure)<\/b><\/strong><\/li>\n<\/ul>\n

        \u2192 Best-fit scenario for BiDi modules, enabling seamless 10G \u2192 100G upgrades without re-cabling.<\/p>\n

          \n
        • <\/b>MPO\/MTP Infrastructure Already Deployed<\/b><\/strong><\/li>\n<\/ul>\n

          \u2192 In this case, SR4 modules may be more suitable.<\/p>\n

          Key Consideration:<\/b><\/strong><\/p>\n

          BiDi = minimize fiber changes<\/p>\n

          SR4 = maximize parallel performance<\/p>\n

           <\/p>\n

          Compatibility and Interoperability<\/strong><\/h3>\n

          Compatibility is a common concern in real deployments:<\/p>\n

            \n
          • Ensure the module supports your switch\/vendor platform <\/b><\/strong>(Cisco, Arista, Juniper, etc.)<\/li>\n
          • Check EEPROM coding \/ vendor lock <\/b><\/strong>requirements<\/li>\n
          • Verify FEC (Forward Error Correction) <\/b><\/strong>support if required by the system<\/li>\n<\/ul>\n

             <\/p>\n

            Recommendation:<\/b><\/strong><\/p>\n

            Use third-party tested compatible modules or vendor-approved optics to avoid link issues.<\/p>\n

             <\/p>\n

            Power Consumption and Thermal Design<\/strong><\/h3>\n

            Compared with SR4 modules, BiDi modules typically have:<\/p>\n

              \n
            • Slightly higher power consumption<\/b><\/strong><\/li>\n
            • More complex optical components (WDM technology)<\/b><\/strong><\/li>\n<\/ul>\n

              Consider:<\/p>\n

                \n
              • Switch port power budget<\/li>\n
              • Airflow design (front-to-back or back-to-front)<\/li>\n
              • High-density deployment scenarios<\/li>\n<\/ul>\n

                 <\/p>\n

                Cost Optimization<\/strong><\/h3>\n

                BiDi modules offer a unique cost advantage in specific scenarios:<\/p>\n

                  \n
                • <\/b>Lower total cost of ownership (TCO) <\/b><\/strong>when reusing existing duplex fiber<\/li>\n
                • Avoid expensive MPO trunk upgrades<\/b><\/strong><\/li>\n
                • Reduce installation complexity and labor cost<\/li>\n<\/ul>\n

                  However:<\/p>\n

                    \n
                  • Unit price of BiDi modules is usually higher than SR4<\/li>\n
                  • Cost savings come from infrastructure reuse<\/b><\/strong>, not module price alone<\/li>\n<\/ul>\n

                     <\/p>\n

                    Application Scenarios<\/strong><\/h3>\n

                    Choose 100G QSFP28 BiDi when:<\/p>\n

                      \n
                    • Upgrading from 10G to 100G <\/b><\/strong>using existing LC duplex cabling<\/li>\n
                    • Data center leaf-spine architectures <\/b><\/strong>with short-reach links<\/li>\n
                    • Environments where fiber resources are limited<\/b><\/strong><\/li>\n<\/ul>\n

                      Avoid or reconsider when:<\/p>\n

                        \n
                      • Long-distance transmission is required<\/li>\n
                      • MPO-based cabling system is already in place<\/li>\n
                      • Ultra-low latency or lowest power consumption is critical<\/li>\n<\/ul>\n

                         <\/p>\n

                        Quick Selection Checklist<\/strong><\/h3>\n
                          \n
                        • Before purchasing, confirm the following:<\/li>\n
                        • Required transmission distance<\/li>\n
                        • Fiber type (LC duplex vs MPO)<\/li>\n
                        • Switch compatibility<\/li>\n
                        • Power and thermal constraints<\/li>\n
                        • Budget vs total cost of ownership<\/li>\n<\/ul>\n

                           <\/p>\n

                           <\/p>\n

                          Application Scenarios of 100G BiDi Optical Modules<\/strong><\/h2>\n

                          100G QSFP28 BiDi optical modules are designed for high-speed 100G Ethernet interconnects and perform particularly well in environments where fiber resources are limited. Below are the main application scenarios:<\/p>\n

                           <\/p>\n

                          Data Center Interconnect (DCI)<\/strong><\/h3>\n

                          In metro-area or campus-level data center interconnects, 100G QSFP28 BiDi modules enable high-bandwidth transmission over distances of 10 km, 20 km, or 40 km while using only a single fiber, effectively alleviating fiber shortages.<\/p>\n

                          Typical use cases:<\/strong><\/p>\n

                          Active\u2013active data centers within the same city<\/p>\n

                          Primary\u2013backup data center interconnections<\/p>\n

                          Cloud data center expansion and scaling<\/p>\n

                           <\/p>\n

                          Medium- to Long-Reach Data Center Interconnects<\/strong><\/h3>\n

                          Typical scenarios:<\/strong> Regional data center interconnections, inter-building links within a campus, and connections between edge data centers and core data centers.<\/p>\n

                          Advantages:<\/strong> Single-fiber transmission saves up to 50% of fiber resources and supports single-mode fiber (SMF), making it ideal for long-reach, fiber-constrained environments.<\/p>\n

                          Applicable environments:<\/strong> Enterprise data center expansion and DCI (Data Center Interconnect) deployments for cloud service providers.<\/p>\n

                           <\/p>\n

                          Telecom and Metro Network Transmission<\/strong><\/h3>\n

                          Typical scenarios:<\/strong> 5G fronthaul and midhaul transport networks, metro backbone interconnections, and links between regional routers and core network equipment for telecom operators.<\/p>\n

                          Advantages:<\/strong> Low latency and high bandwidth with long-reach single-fiber bidirectional transmission, reducing overall infrastructure investment.<\/p>\n

                          Applicable environments:<\/strong> Telecom operator networks and wide area network (WAN) expansion.<\/p>\n

                           <\/p>\n

                          Network Upgrade and Migration Scenarios<\/strong><\/h3>\n

                          Typical scenarios:<\/strong> Smooth upgrades from 10G\/25G\/40G to 100G without replacing existing duplex LC cabling infrastructure.<\/p>\n

                          Advantages:<\/strong> High cost efficiency, reduced cabling complexity and maintenance effort, and support for incremental upgrades (gradual equipment replacement).<\/p>\n

                          Applicable environments:<\/strong> Existing data center retrofits and enterprise network modernization.<\/p>\n

                          Overall, 100G BiDi optical modules are particularly well suited for fiber-constrained and high-density deployment environments, such as modern data centers and telecom networks. They not only improve bandwidth utilization but also significantly reduce CAPEX (capital expenditure) and OPEX (operational expenditure).<\/p>\n

                          <\/h2>\n

                           <\/p>\n

                           <\/p>\n

                          Deployment Considerations and Common Issues<\/strong><\/h2>\n

                          While 100G QSFP28 BiDi optical modules are relatively easy to deploy, several critical points must be addressed to ensure link stability and long-term reliability:<\/p>\n

                           <\/p>\n

                          Key Deployment Considerations<\/strong><\/h3>\n
                            \n
                          1. <\/b>Strict Wavelength Pairing<\/b><\/strong><\/li>\n<\/ol>\n

                            BiDi modules use specific wavelength pairs (e.g., Tx 1271nm must match Rx 1271nm on the opposite end). The A-side and B-side modules must be precisely matched. It is strongly recommended to purchase and install them in pairs with clear labeling.<\/p>\n

                             <\/p>\n

                              \n
                            1. <\/b>Fiber Connector Cleaning<\/b><\/strong><\/li>\n<\/ol>\n

                              BiDi modules are more sensitive to return loss. LC connectors must be thoroughly cleaned using high-quality fiber cleaning tools. Dirty connectors are a common cause of low receive power, unstable links, or high BER.<\/p>\n

                               <\/p>\n

                                \n
                              1. <\/b>Consistent FEC Configuration<\/b><\/strong><\/li>\n<\/ol>\n

                                LR BiDi, ER BiDi, and ZR BiDi typically require Forward Error Correction (RS-FEC or KP-FEC). Both ends of the link must use the same FEC setting. Inconsistent FEC is a frequent cause of link flapping or negotiation failure.<\/p>\n

                                 <\/p>\n

                                  \n
                                1. <\/b>Power Budget and Thermal Management<\/b><\/strong><\/li>\n<\/ol>\n

                                  BiDi modules (especially LR\/ER versions) usually consume slightly more power than traditional dual-fiber modules. In high-density deployments, recalculate rack power and thermal load. Ensure proper front-to-rear airflow and use blanking panels to prevent hot air recirculation.<\/p>\n

                                   <\/p>\n

                                    \n
                                  1. <\/b>Compatibility Verification<\/b><\/strong><\/li>\n<\/ol>\n

                                    Although compliant with QSFP28 MSA, differences in wavelength details and FEC implementation may exist between vendors. It is highly recommended to perform small-scale lab testing or consult the target switch vendor\u2019s official compatibility matrix before full deployment.<\/p>\n

                                     <\/p>\n

                                      \n
                                    1. <\/b>Leave Margin for Real-World Distance<\/b><\/strong><\/li>\n<\/ol>\n

                                      Rated transmission distances are based on ideal conditions. In actual deployments, account for fiber aging, connector loss, and splice points. It is advisable to reserve 20%\u201330% distance margin.<\/p>\n

                                       <\/p>\n

                                      Common Issues and Troubleshooting<\/strong><\/h3>\n

                                      Issue 1: Link does not come up, Rx power = 0<\/b><\/strong><\/p>\n

                                      Cause: Wavelength mismatch, dirty connectors, or reversed A\/B modules.<\/p>\n

                                      Solution: Verify wavelength pairing, clean all LC connectors thoroughly, and confirm correct installation direction.<\/p>\n

                                       <\/p>\n

                                      Issue 2: Link flapping or high BER<\/b><\/strong><\/p>\n

                                      Cause: Inconsistent FEC, excessive fiber loss, or insufficient optical power budget.<\/p>\n

                                      Solution: Align FEC settings on both ends, use OTDR to test total link loss, and replace patch cords if necessary.<\/p>\n

                                       <\/p>\n

                                      Issue 3: DDM shows low receive power<\/b><\/strong><\/p>\n

                                      Cause: Contaminated connectors, tight bend radius, or poor fiber quality.<\/p>\n

                                      Solution: Re-clean all connectors, check bend radius (should be >10\u00d7 fiber diameter), and inspect cabling path.<\/p>\n

                                       <\/p>\n

                                      Issue 4: High module temperature in dense deployment<\/b><\/strong><\/p>\n

                                      Cause: Higher power consumption of BiDi + insufficient rack airflow.<\/p>\n

                                      Solution: Optimize airflow, increase fan speed, or reduce port density if needed.<\/p>\n

                                       <\/p>\n

                                      Issue 5: Interoperability issues when mixing different vendors<\/b><\/strong><\/p>\n

                                      Solution: Prefer using the same vendor\u2019s BiDi modules in pairs. If mixing is unavoidable, conduct thorough interoperability testing in advance.<\/p>\n

                                       <\/p>\n

                                      Pro Tip:<\/b><\/strong>\u00a0Before full deployment, build a test environment and validate link performance using an optical power meter and BER tester. In fiber-constrained projects, planning the BiDi wavelength pairing scheme in advance can significantly reduce future maintenance issues.<\/p>\n

                                       <\/p>\n

                                       <\/p>\n

                                      Conclusion<\/strong><\/h2>\n

                                      In summary, 100G QSFP28 BiDi optical modules, with their single-fiber bidirectional transmission, high fiber utilization, and flexible deployment, are ideal for data center and metro network upgrade scenarios where fiber resources are limited. By lowering cabling and operational costs while efficiently delivering 100G bandwidth, they represent one of the most cost-effective options for today\u2019s 100G network deployments.<\/p>\n

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

                                      As data centers and metro networks evolve toward 100G speeds, fiber resource constraints and rising cabling costs have become common challenges. The 100G QSFP28 BiDi optical module enables 100G high-speed interconnects via single-fiber bidirectional transmission without adding more fibers, making it an ideal solution that balances performance and cost. This article briefly introduces the key […]<\/p>\n","protected":false},"author":1,"featured_media":11603,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_wpscp_schedule_draft_date":"","_wpscp_schedule_republish_date":"","_wpscppro_advance_schedule":false,"_wpscppro_advance_schedule_date":"","_wpscppro_custom_social_share_image":0,"_facebook_share_type":"default","_twitter_share_type":"default","_linkedin_share_type":"default","_pinterest_share_type":"default","_linkedin_share_type_page":"","_instagram_share_type":"default","_selected_social_profile":null},"categories":[30,19],"tags":[],"class_list":["post-11598","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-optical-transceivers-technology","category-products"],"yoast_head":"\n100G QSFP28 BiDi Optical Module: Features, Benefits, and Use Cases - AscentOptics Blog<\/title>\n<meta name=\"description\" content=\"Learn how 100G QSFP28 BiDi optical modules enable single-fiber bidirectional transmission to reduce fiber usage and deployment costs.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ascentoptics.com\/blog\/100g-qsfp28-bidi-optical-module-features-benefits-and-use-cases\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"100G QSFP28 BiDi Optical Module: Features, Benefits, and Use Cases - 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