Archived — Fiber Optic Cable
Fiber Optic Cable Minimum Bend Radius
Optical fiber cable installation is usually just as simple as installing coaxial or UTP cable in horizontal cabling. But the most critical factor in fiber optic cable installation is to keep the fiber cables’ minimum bend radius. If you bend the fiber cable tighter than its minimum bend radius, you risk big loss and even broken fibers. Hence fiber optic cable manufacturers always specify the minimum bend radius under tension and for long-term installation. The following table will give you a reference when deploying fiber optic cables. Application Fiber Count Minimum Bend Radius Loaded Unloaded cm inch cm inch Interbuilding
Breakout Fiber Optic Cable
A breakout fiber optic cable offers a rugged cable design for shorter network designs. This may include LANs, data communications, video systems, and process control environments. A tight buffer design is used along with individual strength members for each fiber. This permits direct fiber optic cable termination without using breakout kits or splice panels. Due to the increased strength of Kevlar members, breakout fiber optic cables are heavier and larger than the telecom types with equal fiber counts. The term breakout defines the key purpose of fiber optic breakout cable. That is, one can “break out” several fibers at any
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Undercarpet Fiber Optic Cable
Undercarpet cable,as this name implies, is run across a floor under carpeting. It is frequently found in open-space office or work areas that are defined by movable walls, partitions. A key feature of this cable is its ability to be rearranged or reconfigured as space needs change. One problem, however, is making turns without stressing the fibers. Unfortunately, the fiber on the outside of the turn must always take a longer path than the fiber on the inside. This unequal path length places differing stresses on the fibers.
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Optical Fiber Macrobending Loss
Optical fibers suffer from macro-bending loss at bends or curves on their paths. This is due to the energy in the evanescent field at the bend exceeding the velocity of light in the cladding and hence the guidance mechanism is inhibited, which causes light energy to be radiated from the fiber. This is shown in the following illustration. The part of mode which is on the outside of the bend is required to travel faster than that on the inside so that a wavefront perpendicular to the direction of propagation is maintained. So part of the mode in the cladding
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Fiber Optic Cable Characteristics of Interbuilding Cables (Backbone Fiber Optic Cables)
The interbuilding backbone fiber optic cabling is the part of a fiber optic network that provides the designer with the most flexible options. However it is also the most constrained by duct availability, right-of-way and other physical barriers. The interbuilding backbone fiber cables must provide some basic characteristics provided its critical application environment. The following list is not exhaustive at all but a minimum requirement. Offers excellent attenuation performance over a wide range of temperatures Sufficiently strong to endure the rigors of installation Its sheath should provide protection against ultraviolet radiation Its sheath should provide protection against gnawing rodents and
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