Introduction
The demand for high-speed data transmission continues to grow, pushing network infrastructures to adopt 100G Ethernet solutions. Among the various 100G optical modules available, 100GBASE-SR4 stands out as an ideal solution for short-range, high-bandwidth connectivity within data centers. Designed for multimode fiber (MMF), this module provides a cost-effective and efficient way to enable high-speed communication over relatively short distances. In this article, we will explore the technical features, advantages, applications, and key considerations when choosing a 100GBASE-SR4 module.
What is a 100GBASE-SR4 Optical Module?
A 100GBASE-SR4 optical module is a QSFP28 transceiver designed to transmit 100Gbps Ethernet signals over multimode fiber (MMF). The “SR” in its name stands for “Short Range,” indicating its suitability for short-distance optical transmission. It uses four optical lanes, each transmitting 25Gbps over separate fiber strands, utilizing 850nm wavelength light signals. This module typically operates over OM3 or OM4 multimode fiber, supporting a maximum transmission distance of 70m on OM3 fiber and 100m on OM4 fiber with an MTP/MPO connector.
Technical Features of 100GBASE-SR4 Optical Modules
100GBASE-SR4 modules leverage parallel optical technology, which transmits data across four separate fiber pairs simultaneously, providing a total of 100Gbps bandwidth. The use of 850nm VCSEL (Vertical-Cavity Surface-Emitting Laser) technology ensures high efficiency and cost-effectiveness for short-distance communication. With low power consumption, typically around 3.5W, SR4 modules help reduce energy costs in high-density data center environments. Their compact QSFP28 form factor makes them compatible with a wide range of networking equipment, such as switches, routers, and network interface cards (NICs).
Advantages of 100GBASE-SR4 Optical Modules
One of the primary advantages of 100GBASE-SR4 modules is their cost efficiency, as multimode fiber and VCSEL-based transceivers are generally more affordable than single-mode alternatives. They offer low-latency, high-speed transmission, making them ideal for high-performance computing and real-time data processing applications. The low power consumption further enhances their suitability for large-scale deployments where energy efficiency is a priority. Additionally, the MTP/MPO connector simplifies cabling and reduces installation complexity, making SR4 modules a plug-and-play solution for high-speed networking.
Applications of 100GBASE-SR4 Optical Modules
100GBASE-SR4 modules are widely used in data centers where high-speed, short-range connectivity is essential. They are commonly deployed in Top-of-Rack (ToR) and Leaf-Spine architectures, enabling fast and efficient interconnects between switches and servers. Cloud computing environments also benefit from SR4 modules, as they provide the necessary bandwidth for handling large-scale data workloads. Enterprises using Hyper-Converged Infrastructure (HCI) rely on these modules for high-speed storage and computing applications. Additionally, they are used in financial institutions and AI-driven workloads, where low latency and high-speed networking are critical.
How to Choose the Right 100GBASE-SR4 Optical Module?
When selecting a 100GBASE-SR4 optical module, it is important to ensure compatibility with existing network equipment, as different vendors may have variations in firmware or specifications. The fiber type should also be considered—while OM3 fiber supports up to 70m, OM4 fiber extends the reach to 100m. Another key factor is power consumption, as lower-power modules help reduce operational costs in large-scale deployments. Lastly, businesses should prioritize reliable manufacturers that offer quality assurance and strong customer support to ensure long-term performance.
Conclusion
The 100GBASE-SR4 optical module is an essential component for modern data center and enterprise networks, offering high-speed, low-latency, and cost-effective connectivity over multimode fiber. With its efficient parallel optical transmission, energy-saving design, and simple cabling, it provides an ideal solution for short-range high-bandwidth applications. As the demand for high-speed networking continues to grow, 100GBASE-SR4 remains a key technology for supporting the ever-evolving needs of cloud computing, AI workloads, and high-performance data centers.
