Tight-buffered cable and loose-tube cable are both excellent rugged fiber optic cables, the former of which is usually used for moderate length indoor and indoor/outdoor applications, while the latter is for long-distance outdoor applications. The core of the cable is never at risk of exposure, unlike the loose-buffered cable which can escape its confines.
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Aerial optical cable is suspended in the air from poles and/or support structures. Most often it is supported between poles by being lashed to a wire rope messenger strand with a small gauge wire. Deploying fiber above ground on poles or towers removes the need for underground digging and is particularly useful when the ground is uneven, rocky or both. Unlike buried cable, they excel in rural or suburban areas where trenching is impractical. Where reels are supplied with protective material fitted over the cable, the protection should remain in place until the cable will be installed.
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The fiber optic 90-degree bend refers to the minimum radius required when cables must change direction at right angles. Similar to how a garden hose restricts water flow when kinked, fiber optic cables experience performance degradation or complete signal loss when bent too sharply. Yes, fiber cables can be bent during installation, which proves particularly useful when you pull cables into position rather than using blown installation methods.
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New fiber lines can be installed to pass through empty conduits if the bandwidth is needed in the future, thus no new path needs to be trenched. Directly buried cables are exposed to challenges such as rocks, roots, rodents, excavation, frost heaves, and many others. The existing 2" conduit contains 4x 1/0 XLPE cable (rated for direct-burial), so I plan on pulling outdoor rated, non-metallic fiber through the same conduit. My original plan was to trench new conduit and run CAT8, but given that the existing run is all "customer side" and installed by the former. The conduit protects the fragile fiber optic cables from environmental factors and physical damage, ensuring their longevity and optimal.
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For multimode fiber, the loss is about 3 dB per km for 850 nm sources, 1 dB per km for 1300 nm. This Applications Engineering Note (AE Note) discusses the criteria for properly selecting the optimal multimode fiber (MMF) for enterprise applications. The document gives details on the measurement procedure, which is based on the Electronics Industries Association Recommended Standard as published in RS. Attenuation in fiber optics is the gradual loss of light signal strength as it travels through a fiber cable.
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