Fiber break, broken fiber is divided into two types: partial interruption and the entire optical cable interruption

Partial interrupts are of the following categories:

The first reason is that the fiber core is interrupted due to external force extrusion or excessive bending.

During the construction process of the optical cable, due to external force extrusion or too small bending radius, some fiber cores of the optical cable are interrupted, which is more common. It is also a kind of soft fault, which is very difficult to find and deal with.

The second is that the joint box is damaged and interrupted due to water ingress.

Fiber core damage and interruption caused by water ingress into the splice box at the optical fiber fusion point is the most common fault for partial fiber core interruption of the optical cable. Water molecules invade the splice box, pass through the gap of the heat shrink tube and finally reach the fusion point of the optical fiber fusion core. Water molecules will enter into the bond chains of silica molecules in the glass fiber core, and eventually undo the bond chains of the silicon-oxygen tetrahedron, resulting in light decay or fiber breakage at the joint. This fault is also the most common fault phenomenon of partial fiber core interruption of the optical cable. This kind of fault is also a soft fault, and it is also very difficult to find and deal with.

The third is the interruption of the fiber core caused by animal bites.

Communication optical cables buried underground are extremely easy to be bitten by rodents, and overhead optical cables are also easy to be pecked by woodpeckers, causing partial core interruptions. Due to the small damage to the optical fiber, such faults are also very difficult to deal with.

The fourth is external construction, accidentally touching the optical cable, causing partial interruption.

Whether it is an optical cable buried underground or an overhead optical cable, it is often hit by a third-party construction work or a tall vehicle, accidentally touching the optical cable, causing the damaged part of the optical fiber core to be interrupted. This failure is relatively easy. To deal with it, you only need to check section by section along the optical cable path, and you can basically determine the location of the fault if you see the construction vehicles or the traces left after construction.

The fifth is that the traction tension of the optical cable is too large. Causes partial fiber core interruption.

The span of the overhead optical cable is too large, or a vehicle scratches the optical cable, and the gradual change of the buried optical cable due to the geological landslide may also cause the traction tension of the optical cable to be too large, which may eventually damage the optical fiber core and cause some core interruptions. This type of fault is relatively easy to observe changes, and the damage to the optical cable is more obvious, and it is also a relatively easy-to-handle optical cable fault.

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