In general, SR modules are optimized for shorter distances and are most often associated with 850nm operation over multimode fiber (MMF). In reality, SFP transmission distance is defined by optical design—not data rate. An SFP (Small Form-factor Pluggable) module transmits data over fiber using specific wavelengths and power levels, which directly influence how far the signal can travel before degradation occurs. DR (Distance Range): Up to 500 meters, using single-mode fiber for inter-data. According to the different transmission distances of optical modules, they can be divided into three types: short-distance optical module s, medium-distance optical modules, and long-distance optical modules. Common center wavelengths for gray optical modules include: 850 nm (with MMF): Can transmit up to 2 km at 100M rate, 550 m at 1G rate, 300 m at 10G rate, 400 m at 40G rate, and 100 m at 25G/100G/200G/400G rates. For high-speed SFP modules, optical components account for approximately 90% of the total BOM (Bill of Materials) cost—underscoring their critical role in.
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