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SFP (Small Form Factor Pluggable) is a compact, hot-swappable transceiver module that converts electrical signals into optical signals (and vice versa), enabling long-distance communication between devices. One of the main advantages of SFP modules is their hot-swappable nature, which allows them to be inserted or removed without powering down network devices.
The difference between them is the speed difference. The broadband of 1.25G SFP is 1.25Gbps, which is usually used for Gigabit-level Ethernet transmission. The bandwidth of 100G QSFP28 is 100Gbps, playing the role of a massive data highway.
An optical transceiver is an optoelectronic device that uses optical signals to achieve high-speed data transmission. It provides stable, high-speed, and long-distance data interaction capabilities for communication equipment through the mutual conversion of electrical and optical signals, combined with optical fiber transmission media. Structurally, an optical transceiver mainly consists of an optical transmitting device (TOSA, including a laser), an optical receiving device (ROSA, including a photodetector), functional circuits, and optical (electrical) interfaces.
Driven by the rapid development of AI training clusters, hyperscale cloud data centers, and 5G core networks, 400G Ethernet interfaces have become the standard for next-generation networks. When selecting modules, the choice between form factors (QSFP-DD vs. OSFP) and optical interface types (such as SR4, DR4, or FR4) significantly impacts network performance, power consumption, cost, and future scalability. This article outlines the selection logic for 400G optical modules based on application scenarios and provides specific deployment recommendations.
With the growth of AI clusters and cloud computing, 400G optical modules have become the preferred choice for data centers. Among the various models and form factors available, the QSFP-DD DR4 stands out as an ideal solution for 400G data center deployments due to its low cost, high density, and ease of maintenance. YXFiber’s YXF-QDD-400G-DR4 fully meets the diverse requirements of data center applications. This article explores two typical connectivity scenarios for this module within actual data center networks.
