Normal optical attenuation values for single-mode fiber 1310 band
Typical attenuation for single-mode fiber at 1310 nm is around 0.35 dB/km, with standard ranges between 0.30 and 0.40 dB/km.
Standard Attenuation Values
For single-mode fibers compliant with ITU-T G.652 (including G.652.B, G.652.C, and G.652.D), the typical attenuation at 1310 nm is:
- Nominal value: 0.35 dB/km
- Acceptable range: 0.30–0.40 dB/km
- Maximum limit: Often specified as ≤0.36–0.40 dB/km depending on fiber category and manufacturer . These values are measured under standard conditions and represent the intrinsic fiber loss, excluding connector or splice losses.
Key Characteristics at 1310 nm
- Low chromatic dispersion: The 1310 nm wavelength is near the zero-dispersion point for standard single-mode fibers, minimizing pulse broadening over medium distances .
- Medium-range transmission: Ideal for metropolitan and regional networks, typically supporting distances up to 10–20 km without amplification .
- Comparison with 1550 nm: While 1550 nm fibers have lower attenuation (~0.20 dB/km), 1310 nm fibers are preferred for shorter links due to minimal dispersion and cost efficiency .
Practical Considerations
- Fiber category: G.652.B fibers are widely used for standard applications, while G.652.C and G.652.D fibers have reduced water peak attenuation, allowing operation across a broader wavelength range without significant loss .
- Installation effects: Actual link attenuation may be slightly higher due to splices, connectors, and bending losses, but the intrinsic fiber attenuation remains the primary design parameter .
- Measurement standards: Attenuation is measured using an optical power meter and light source at 1310 nm, following ITU-T G.650.1 and G.650.2 guidelines . In summary, single-mode fiber at 1310 nm typically exhibits 0.35 dB/km attenuation, making it suitable for medium-distance optical networks with minimal signal degradation and low dispersion. Proper installation and adherence to ITU-T standards ensure reliable performance across metropolitan and regional links.
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