For OS2 outside plant, singlemode optical fiber cable, at which wavelength can attenuation be as high as 0.4 dB/km?

The correct response indicates that attenuation can reach up to 0.4 dB/km at all the specified wavelengths for OS2 singlemode optical fiber. Optical fiber attenuation varies with different wavelengths due to the intrinsic properties of the fiber and the light source being utilized.

At 1260 nm, the attenuation can be influenced by factors such as water peak absorption, which can lead to higher loss rates. At around 1310 nm, singlemode fibers are typically optimized for lower attenuation, but there still exists a possibility of reaching higher values under certain conditions or within specific types of fibers. The 1550 nm wavelength is often used for long-distance telecommunications as it can provide the lowest attenuation compared to the other wavelengths, but it can still exhibit losses, particularly in certain fiber types or environmental conditions.

This higher attenuation value at these wavelengths signifies the potential impact of diverse materials and construction techniques in fiber optic cables, emphasizing the importance of evaluating specific cable performance specifications when planning and installing outside plant cabling.