Indoor optical cables are optical cables laid in buildings. They are mainly used for communication equipment, computers, switches and end-user equipment in buildings.
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Indoor optical cables are mainly suitable for wiring in buildings and connections between network devices.
A. Pay attention to the depth of the cutting when stripping the optical cable.
The key to stripping the outer sheath of an optical cable is to master the depth of the sheath cutting knife, otherwise fiber breakage will easily occur.
In actual operation, the sheath cutting knife should be rotated while paying attention to the incision. If a white polyester tape can be seen, the knife should be stopped and the cutting knife should be removed.
This step is a skillful process, and it requires many exercises to master the depth of penetration.
B. Fixing of optical cable and stripping of fiber core bundle tube.
After stripping the optical cable, fix the optical cable in the optical cable connector box, strip the fiber core bundle tube, and make all preparations before optical fiber splicing.
At this time, please note that 1.) The fiber core bundle tube cannot be twisted.
Before fixing the optical cable, you must pay attention to the location of the core bundle tube. When the strength member passes through the fixing screw, the underside of the strength member must be the filling bundle tube, not the core bundle tube. The fiber core bundle The tube must be on the same side as the strength member enters the fiber containment tray and cannot be twisted on the strength member.
If the reinforcement is pressed against the core bundle tube, the force deformation of the core bundle tube will cause excessive loss. The optical fiber in the core bundle tube will also break due to long-term stress, which will cause engineering problems. Leave hidden dangers behind.
2.) The length of the reinforcement should be appropriate.
After the position of the fiber core bundle tube is determined, the optical cable can be fixed.
The optical cable must be fixed so that the position of the optical fiber in the connector box does not become loose, so as to avoid increased optical fiber loss or fiber breakage caused by movement of the optical cable position.
The fixation of the optical cable is divided into the fixation of the reinforcement and the fixation of the remaining parts of the optical cable.
When fixing the reinforcement, pay attention to its length. If it is too long, it will not fit in the connector box; if it is too short, it will not be able to fix the optical cable.
Generally, when cutting the strength member, the distance between the splint that fixes the optical cable and the screw that fixes the strength member should be equal to the remaining length.
The rest of the optical cable is fixed by tightening the splint with screws after the reinforcement is fixed, and tightly fixing it at the optical cable entrance of the connector box.
3.) The stripping length of the fiber core bundle tube must be appropriate.
After the optical cable is fixed, the core tube can be stripped.
If the stripping length is too long, it will reach the slot where the fiber heat shrink tube is placed, and the remaining fibers will be damaged during fiber coiling; if the stripping length is too short, the fixing clip will get stuck when the fiber core bundle tube is fixed. On optical fiber, it is easy to damage the fiber.
Therefore, it is generally appropriate to peel it until it has passed the two fixing bayonet. At this length, the core bundle tube will not cause stress damage to the optical fiber and can be well fixed.
However, the clips cannot be clamped too tightly when fixing, otherwise the optical fiber in the core bundle tube will be damaged due to stress.The force increases the loss, and the optical fiber will break over time, leaving hidden dangers for the project.
C. Optical fiber splicing.
The splicing of optical fibers is directly related to the quality and life of the project, and the key lies in the preparation of the optical fiber end face.
The optical fiber end face is smooth and has no burrs or defects. The fusion splicer can accept the confirmation well and make joints that meet the engineering requirements. If the optical fiber end face is unqualified, the fusion splicer will refuse to work or connect out. The joint loss is very large and does not meet the engineering requirements.
In the process of making the optical fiber end face, first when stripping off the optical fiber coating, the wire stripper should be perpendicular to the optical fiber axis to ensure that the wire stripper does not scratch the optical fiber; when cutting the optical fiber, strictly follow the Operate according to the regulations. When using the end face cutting knife, the cutting length must be accurate, the movement should be fast, and the force must be skillful to ensure that the optical fiber is broken, not crushed; when removing the optical fiber, ensure that the optical fiber does not touch any object. Avoid bumps on the end face, so that the end face will be smooth and qualified.
The fusion splicer is the key equipment for fiber optic splicing. It is also a highly precise and expensive equipment.
The procedures must be strictly followed during use, otherwise heavy losses may occur.
Special attention needs to be paid to the operating procedures of the welding machine. The length setting of the heat shrink tube should be consistent with the requirements.
D. Protection of remaining fibers After the optical fiber is spliced, it is necessary to protect the optical fiber with a heat shrink tube and to retain the remaining fibers.
At this time, attention should be paid to: 1.) During the fiber coiling process, the bending radius of the fiber coil should not be too small, generally not less than 4mm.
If the bending radius is too small, it will easily cause excessive refractive loss and increased dispersion.
Over time, fiber breakage may also occur.
2.) When coiling fiber, pay attention to the twisting direction of the fiber, which is usually an inverted "8" shape. Be careful not to twist the fiber. After coiling, put all the fibers under the baffle of the storage tray. , to avoid damaging the optical fiber during packaging.
E. Sealing of the splice box The sealing of the optical cable splice box is very important in actual projects.
Because the surface of the optical fiber is prone to micro-cracks after water enters the connector box, and the optical fiber will break over time. Moreover, most connector boxes are directly buried underground, so the connector box must be properly installed. seal.
The sealing of the connector box is mainly the sealing between the optical cable and the connector box, and the upper and lower covers of the connector box.
When sealing the optical cable and the joint box, the optical cable sheath at the sealing point must first be polished, and use gauze to polish the outer sheath perpendicularly to the axial direction of the optical cable so that the optical cable and sealing tape can be well combined. Tighter and better sealed.
For sealing between the upper and lower covers of the joint box, the main thing is to pay attention to the sealing tape to be evenly prevented in the sealing groove of the joint box, and tighten the screws without leaving any gaps.
