The splicing of outdoor optical fibers is a very important link in network projects. Reducing the splicing loss is something we all need to consider. Mastering these methods can avoid the occurrence of faults in the project, thereby reducing the splicing loss of optical fibers.
1. The brand of optical fiber is the same
Try to use the same batch of high-quality brand-name bare fibers on a line. For the same batch of outdoor optical fibers, the mode field diameters are basically the same. Splicing at this break point minimizes the effect of mode field diameter on fiber splice loss. Therefore, optical cable manufacturers are required to use the same batch of bare fibers to produce continuously according to the required length of optical cable, number them sequentially on each reel and distinguish A and B ends, and do not skip numbers. When laying optical cables, they must be laid out along the determined routing sequence according to the number, and ensure that the B end of the front optical cable is connected to the A end of the next optical cable, so as to ensure that the connection can be welded at the disconnection point, and the fusion loss value can be reached. minimum.
Two, multi-person construction, to prevent folding and twisting
Optical cable erection is carried out according to the requirements. During the optical cable laying construction, it is strictly forbidden to make small circles, folds, and twists on the optical cable. Long-distance optical fibers require multiple people to work at the same time, and they are equipped with walkie-talkies. Effectively prevent the occurrence of back buckle. The traction force should not exceed 80% of the allowable optical cable, and the instantaneous maximum traction force should not exceed 100%, and the traction force should be added to the reinforcement of the optical cable. The laying of optical cables should strictly follow the requirements of optical cable construction, so as to minimize the probability of outdoor optical fiber damage during optical cable construction, and avoid the increase of fusion loss caused by optical fiber core damage.
Outdoor Fiber
3. Standard welding
Select experienced and well-trained fiber splicing personnel for splicing, but the level of splicing personnel directly affects the size of the splicing loss. Splicing personnel should perform splicing in strict accordance with the optical fiber fusion splicing process flow chart, and use OTDR to test the splicing loss of the splicing point during the splicing process. Those that do not meet the requirements should be re-spliced. For points with large splice loss values, the number of repeated splices should be 3 to 4 times. When the splice losses of multiple optical fibers are large, a section of optical cable can be cut off and spliced again.
4. Welding environment
Splice optical cables should be carried out in a clean environment. It is strictly forbidden to operate in the open air in a dusty and humid environment. The optical cable connection parts, tools and materials should be kept clean, and the optical fiber connectors should not be allowed to get wet. The outdoor optical fibers to be cut must be clean and free from dirt. . After cutting, the optical fiber should not be exposed to the air for too long, especially in a dusty and humid environment.
5. Welding process
Choose a high-precision optical fiber end face cutter to prepare the end face of the optical fiber. The quality of the end face of the optical fiber directly affects the size of the fusion loss. The cut optical fiber should be a flat mirror surface without burrs and defects. The axial inclination angle of the fiber end face should be less than 1 degree. A high-precision fiber end face cutter not only improves the success rate of fiber cutting, but also improves the quality of the fiber end face. This is especially important for maintenance and emergency repair of fusion splices and optical fibers that cannot be tested by OTDR.
6. Standard use of welding machine
The fusion splicer should be used correctly. The function of the fusion splicer is to fuse two outdoor optical fibers together, so the correct use of the fusion splicer is also an important measure to reduce the fiber splicing loss. Correctly and reasonably set the splicing parameters, pre-discharge current, time and main discharge current, main discharge time, etc. according to the fiber type, and remove the dust in the fusion splicer in time during and after use, especially the fixture, mirrors and V-groove Removal of dust and fiber debris inside.
