Temperature change effect on fiber can be as high as how many dB per kilometer?

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Multiple Choice

Temperature change effect on fiber can be as high as how many dB per kilometer?

Temperature changes cause the fiber to expand and contract and can impose mechanical stresses on the cable jacket. Those motions create microbends and occasional macrobends, which scatter light and add attenuation along the fiber length. In outside plant design, a conservative worst-case value for temperature-induced loss is about 2 dB per kilometer, which is notably higher than the fiber’s normal intrinsic attenuation (roughly 0.2–0.5 dB/km in the C-band). The smaller values shown are closer to intrinsic attenuation or are unrealistically large for temperature effects, so 2 dB/km represents the worst-case impact you’d plan for to ensure a reliable link over long distances. Real numbers vary with installation and environment, but the 2 dB/km figure is used as a design margin for temperature-related losses.

Temperature changes cause the fiber to expand and contract and can impose mechanical stresses on the cable jacket. Those motions create microbends and occasional macrobends, which scatter light and add attenuation along the fiber length. In outside plant design, a conservative worst-case value for temperature-induced loss is about 2 dB per kilometer, which is notably higher than the fiber’s normal intrinsic attenuation (roughly 0.2–0.5 dB/km in the C-band). The smaller values shown are closer to intrinsic attenuation or are unrealistically large for temperature effects, so 2 dB/km represents the worst-case impact you’d plan for to ensure a reliable link over long distances. Real numbers vary with installation and environment, but the 2 dB/km figure is used as a design margin for temperature-related losses.

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