Some problems needing attention in the connection of optical cable

Several problems should be noticed in the connection of optical cable.

1. Note the depth of the knife when opening the optical cable. The key to open the outer sheath of optical cable is to master the depth of the cutting tool, otherwise it is easy to break the fiber. In the actual operation, should rotate the sheath cutting knife, while observing the incision, if you can see the white polyester belt, you should stop the knife, remove the cutting knife. This step is a skilled process and requires many exercises to master the depth of the knife.

2. Optical cable fixation and fiber core beam tube open stripping. After the optical cable is peeled, the optical cable is fixed in the cable connector box, and the core beam tube is opened to do the preparation work before the optical fiber fusion.

Note at this point:

A the fiber core bundle tube cannot twist. Before fixing the cable, attention must be paid to the position of the fiber-core bundle tube, the reinforcing parts through the fixing screws, the reinforcement must be filled beam tube, can not be the core beam tube, the core beam tube must be in the reinforcement into the fiber-optic reception plate on the same side, can not be twisted on the strengthening pieces. If the reinforcing parts are pressed on the core bundle tube, the deformation of the core beam tube will cause the loss too much, and the fiber in the fiber core bundle tube will rupture due to the long-term stress, leaving the hidden trouble to the project.

(b) The length of the reinforcing piece should be appropriate. After the position of the fiber core beam is confirmed, the cable can be fixed. The optical cable must be fixed in the connector box in the position will not be loose, to avoid the cable position due to the movement of the optical fiber loss increase or the problem of broken fiber. The fixation of the optical cable is divided into the fastening of the reinforcing parts and the rest of the cable. The fastening of the reinforcing parts should pay attention to its length, too long, not fit in the joint box, too short to fix the function of the cable. In general, when the reinforcing parts are cut, the distance between the splint of the fixed optical cable and the screw of the fixed reinforcing part is equal to the length of the retaining. The rest of the cable is fixed in the reinforced parts after the fastening, with screws tightening splint, tightly fixed in the junction box of the optical cable import department.

c) The length of the fiber core bundle tube should be suitable. After the cable is fixed, it can be opened to peel the core beam tube. Open stripping length is too long, to the fiber-optic heat-shrinkable tube placed slot, in the disc will damage the remaining fiber, the length of the open stripping is too short, the core beam tube fixed, fixed clamp will be stuck in the fiber, easy to damage the fiber. As a result, it is generally opened to peel over the two fixed card mouth is advisable, in this length of fiber core beam tube will not cause damage to the optical fiber, but also can be well fixed. But fixed when the clamp can not be too tight, otherwise the fiber core beam tube will increase the loss due to the force, time long fiber will break, leaving the project with hidden trouble.

3. Optical fiber welding. The connection of optical fiber is directly related to the quality and life of the project, the key of which is the preparation of the fiber end surface. Optical fiber End smooth, no burrs or defects, welding machine can be well accepted, and to meet engineering requirements of the joint, if the optical fiber end is unqualified, the welding machine refused to work, or the joint loss is very large, do not meet the engineering requirements. In the process of making the optical fiber end surface, the stripping clamp is perpendicular to the optical fiber axis when the fiber coating layer is stripped. Ensure that the stripping clamp does not scratch the optical fiber, in the cutting of optical fiber, strictly in accordance with the procedures to operate, the use of end-cutting knife to achieve cutting length, fast, skillful, to ensure that the fiber is broken, not crushed In the fiber, to ensure that the optical fiber does not touch any object, to avoid the end of the impact, the end of the surface is smooth, qualified. Welding machine is a key equipment for optical fiber fusion, and also a high precision and expensive equipment. In the use of the process must be strictly in accordance with the procedures to operate, or may cause significant losses. In particular, it is necessary to pay attention to the operating procedures of the welding machine, the length of the heat shrinkable pipe should be consistent with the requirements.

4. After the protection of fiber-optic fused, it is necessary to the optical fiber for the thermal shrink tube protection, but also to the remaining fiber for disk retention.

Attention should be paid to:

A fiber in the course of the disc fiber, the bending radius of the coil can not be too small, generally not less than 4mm. The bending radius is too small to cause the refractive loss to be too large and the dispersion increase. A long time, may also appear the phenomenon of fiber-breaking.

b in the disk fiber, pay attention to the twisted direction of fiber, is generally inverted "8" font, attention not to break the fiber, after the plate will be all the fiber into the shelter plate under the baffle, to avoid damage to the packaging fiber optic.

5. The sealing of the joint box is very important in the actual project. Because the connector box water after the fiber surface is very easy to produce micro-cracks, long time the fiber will break, and the joint box is buried in the underground most of the way, it must do a good job of sealing the joint box. The sealing of the joint box is mainly the seal between the cable and the joint box and the upper and lower cover of the joint box. In the optical cable and the sealing of the joint box, the first to seal the cable sheath of the grinding work, with gauze on the outer sheath on the vertical optical cable to polish, so that the cable and sealing tape more tightly combined, sealing better. Joint box upper and lower cover between the seal, the main is to pay attention to the sealing tape should be evenly to prevent the joint box in the sealing groove, the screws tighten, do not leave gaps.