Measures to Reduce Loss of Optical Fiber Splicing

The optical fiber fusion splicing technology mainly uses a fiber fusion machine to connect optical fibers and optical fibers or optical fibers and pigtails, and fuse the bare fibers and optical fiber pigtails in the optical cable together into a whole, while the pigtail has a separate optical fiber head. Let's take a look at the measures to reduce the loss of fiber splicing.

measures to reduce losses

1. Try to 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. impact is minimized. 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 out according to the number along the determined routing sequence, and ensure that the B end of the optical cable in the front coil is connected to the A end of the optical cable in the next coil, so as to ensure that the connection can be spliced ​​at the disconnection point, and the splice loss value reaches minimum.

2. Optical cable erection as required

In the construction of optical cable installation, it is strictly forbidden to make small circles, fold and twist the optical cable. More than 80 people must construct the 3km optical cable, and more than 100 people must construct the 4km construction, and be equipped with 6 to 8 walkie-talkies; The new cable laying method 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 should 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.

3. Select experienced and well-trained fiber optic splicing personnel for splicing

Most of the welding is automatically welded by the welding machine, but the level of the connecting personnel directly affects the size of the connecting 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 larger splicing loss value, the number of repeated splicing should be 3 to 4 times.

4. The splicing of 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 connecting parts of the optical cable, tools and materials should be kept clean, and the optical fiber connector should not be damp. The optical fiber to be cut must be clean and free of dirt. After cutting, the fiber must not be exposed to air for too long, especially in dusty and humid environments.

5. Select high-precision fiber end face cutter to prepare fiber end face

The quality of the fiber end face directly affects the size of the splice loss. The cut fiber should be a flat mirror surface without burrs and 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.

6. Correct use of fusion splicer

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. Correctly and reasonably set the splicing parameters, pre-discharge current, time, 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. 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-slot driver.

The above are the measures to reduce the loss of optical fiber fusion.