Many factors affect fiber optic cable fusion splicing loss, only to eliminate the impact of various undesirable factors to fundamentally reduce the fusion loss of fiber optic splices, thereby reducing fiber optic line transmission loss.
According to practice and relevant information, it is recommended that the following measures can be taken to reduce the fusion splicing loss of optical fiber connectors.
(1) to strictly splicing process while fusing fiber optic cable fusion splicing loss, fusion loss does not meet the requirements of the joint must be re-fiber cable splicer, the number of repeated fusion splicing to 3 to 4 times is appropriate after three consecutive fusion splicing is still not much improvement, in the exclusion of fusion machine generally causes as long as it reaches three times Fusing in the most coin value can be, do not repeatedly fuse to avoid excessive consumption of optical fiber weld tray to bring adverse effects.
Coiled in the wiring package on the fiber storage disk, fiber residual length should be not less than 60cm, spiral circle radius to be as large as possible, splicing if the same fiber on the previous joint fusion loss is harmful, then the immediately following a joint fusion loss value can be larger, if the fusion loss value of the front joint is more significant. Immediately following a joint fusion, the loss value shall be more negligible or negative to avoid the end of the fiber optic cable Fiber damage to the end of the fusion loss in the fusion of optical cable preparation work can cut off some of the cable head.
(2) Splicing fiber must be in a clean environment, such as in a construction vehicle or small tent, in a dusty and humid climate unsuitable for fusion splicing.
Fiber optic splicing parts and splicing tools must be kept clean and dry, the preparation of the fiber optic cross-section must be wiped first after cutting, and the practice of the fiber cross-section must be pure without dirt. It should not be exposed to air for long and not let it get wet.
The fiber section should be cut neatly, and the inclination angle between the two teams should be less than 0.3 degrees.
The fiber is placed into the V-slot of the fusion splicer when the action should be light; this is because the core diameter of 10 Pm single-mode fiber if the fusion loss is less than 0.1dB, the radial offset of the fiber axis to be less than 0.8Pm.
(3) the ends of the cable into the junction box must be fixed securely so as not to hang the junction box due to the twisting of the fiber optic connector position misalignment, resulting in the loss of the standard measurement value is enormous.
In the fusion construction often found fusion, the fusion loss value measured under the 1550nm window meets the requirements. Still, after sealing the junction box to retest, the value of the loss of the joint is significant, which is usually caused by the fiber joint position misalignment; this can be changed in the 1310nm window retest if the measured value is small is the fiber joint position misalignment, to recoil the remaining length of the fiber, if the large is the fusion problem, to re To avoid this phenomenon, the fiber optic splice and fiber residual length must be firmly fixed in the fiber storage plate with self-adhesive tape.
The coiling diameter of the remaining length of the fiber optic cable on both sides of the junction box straight control at about 40cm should not be too small to avoid damage to the fiber in the unified due to excessive distortion.
(4) fusion splicing machine and cutting tools, such as optical cable splicing loss, also have a more significant impact; fusion splicing according to the type of fiber correctly and reasonably sets the fusion parameters, such as pre-melt current, pre-melt time, and the primary fusion current, central fusion time, etc.
The fiber cable splicer should be removed promptly when the fusion splicer V groove and cutting tool in the fiber debris and dust. After using the fusion splicer, remove the dust on the machine shell; if used in a humid environment, you must also do the moisture-proof treatment.
The service life of the fusion splicer electrode is generally about 2000 times, requiring each discharge fusion 20 times after running the cleaning program to clean the electrode, but in the case of clean fiber and good splicing conditions can be fused about 60 times discharge cleaning, poor working conditions can be fused 30 to 40 times after the discharged cleaning, to extend the service life of the electrode and not to increase the fusion loss. The use of a long-time fusion machine electrode above a layer of grayscale will lead to a large discharge current and increase the value of fusion loss, this time you can remove the electrode, gently wipe it with alcohol cotton, and then install it on the fusion machine and discharge cleaning once, if the discharge current is still significant after several cleaning, it is necessary to replace the electrode.
In addition, it is to select a solid dust-proof ability suitable for fusion splicing machine in the wild night operations to fiber optic cable fusion splicing.
In addition, the choice of fiber optic cable, because the fiber is disconnected at a certain point after the disconnection of the mode field diameter is the same, so the fusion splicing at the disconnection of the fiber optic mode field diameter on the fusion loss of the most negligible impact, so the cable manufacturer must be required to use the same production batch of high-quality brand-name bare optical fiber according to the order length of continuous production, according to the specified disk length will be disconnected from the cable winding disk, the winding of the cable disk serial number and clear A, B end (disconnected in the previous tray if the B end in the immediately after a range of tray for the A end), shall not jump number or confusion.
Laying according to the determined route according to the numbering order of the unified disk and the B end of the previous disk cable to be connected to the A end of the next disk, to ensure that the disconnection fiber optic cable fusion splicing, to avoid the inconsistency of the fiber optic mode field diameter and lead to fiber optic cable fusion splicing loss is large The shortcomings of the fiber optic cable fusion splicing.
And in laying the traction speed wood greater than 20m/min step-less speed regulation of the mechanical traction method, traction force shall not exceed 80% of the allowable tension of the cable. The maximum instantaneous traction force does not exceed 100%; the traction force must be applied to the reinforcement in the line after the erection of the cable by the maximum load elongation rate should be less than 0.2% to avoid the traction process of fiber optic stress and distortion, in the necessary to make Fiber optic cable traction end, the construction of the bending radius of the cable should be more significant than 25 times the diameter of the thread (DL/T 788-2001), the cable must be released from the top of the unified plate and maintain a loose arc and no twist, forbidden to play a small circle bending twisting, etc., to minimize the chance of damage to the fiber in the cable, to avoid damage to the thread at the end of the line and increase the splice fusion loss.