As far as possible, use the same batch of high-quality brand-name bare fibers on a line. For the same batch of fibers, the mode field diameters are basically the same. After the fiber is disconnected at a certain point, the mode field diameters between the two ends can be regarded as the same. Therefore, here Breakpoint splicing minimizes the effect of mode field diameter on fiber splice loss. Therefore, fiber optic cable manufacturers are required to use the same batch of bare fibers, continuously produce them according to the required length of the fiber optic cable, and sequentially number and distinguish the A and B ends on each reel, without skipping numbers. When laying the optical cable, it must be laid according to the determined routing sequence, and ensure that the B end of the optical cable in the front disk is connected to the A end of the optical cable in the next disk, so as to ensure that the connection can be spliced at the disconnection point, and the fusion loss value reaches minimum.
Optical cable installation is carried out according to the requirements. During the optical cable laying construction, it is strictly forbidden to make small circles, fold and twist the optical cable. More than 80 people must construct the optical cable for 3km, and more than 100 people must construct the 4km cable, and be equipped with 6-8 walkie-talkies; , The cable laying method of "on the shoulder of the optical cable" can effectively prevent the occurrence of back buckle. The traction force shall not exceed 80% of the allowable optical cable, and the maximum instantaneous traction force shall not exceed 100%. The traction force shall be added to the strength member of the optical cable. The optical cable should be laid in strict accordance with the construction requirements of the optical cable, so as to minimize the probability of the optical fiber being damaged during the construction of the optical cable, and avoid the increase of the fusion loss caused by the damage of the optical fiber core.
Select experienced and well-trained optical fiber splicing personnel for splicing. At present, most of the fusion splicing is automatically spliced by the fusion splicer, but the level of the splicing personnel directly affects the size of the splicing loss. The splicing personnel should strictly follow the optical fiber splicing process flow chart, and during the splicing process, they should use the OTDR to test the splice loss of the splicing point while splicing. Those that do not meet the requirements should be spliced again. For the point with a large splicing loss value, the number of repeated splicing should be 3 to 4 times.
The splicing cable should be carried out in a clean environment. It is strictly prohibited to operate in the open air in a dusty and humid environment. The splicing parts, tools and materials of the optical cable should be kept clean. After cutting, the fiber must not be exposed to air for too long, especially in dusty and humid environments.
Use a high-precision fiber end face cutter to prepare the fiber end face. The quality of the fiber end face directly affects the size of the splice loss. The cut fiber should have a flat mirror surface, no burrs, and no defects. The 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 splices that cannot be tested by OTDR (ie, blind spots for OTDR testing) and fiber maintenance and repair.
The fusion splicer should be used correctly. The function of the fusion splicer is to splicing two optical fibers together, so the correct use of the fusion splicer is also an important measure to reduce the optical fiber splice loss. Set the splicing parameters, pre-discharge current, time, main discharge current, main discharge time, etc. correctly and reasonably 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. Before each use, the fusion splicer should be placed in the fusion environment for at least fifteen minutes, especially in places where the placement and use environment are quite different (such as indoor and outdoor in winter). , reset the discharge voltage and discharge position of the fusion splicer, and reset the V-groove driver.
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