1. Fiber optic splicing. Fiber optic splicing should follow the principles of: the number of cores equal, to the corresponding color fiber butt in the same bundle, the number of cores is different, in order to connect the cores first, then the cores of small.
2. Fiber optic splicing methods are: fusion splicing, active connection, mechanical connection of three. Most of the fusion method is used in the project. Using this fusion splicing method of contact loss is small, reflection loss, high reliability.
3. The process and steps of fiber optic splicing.
① open and strip the fiber optic cable, and the cable is fixed to the splice box. Be careful not to hurt the bundle tube, stripping length of about 1m, wipe clean with toilet paper, the fiber optic cable into the splice box, fixed wire must be pressed, there can be no loose. Otherwise, it is possible to cause the cable to roll broken fiber core.
② Split fiber through the heat-shrinkable tube. Separate different bundles and colors of optical fiber through the heat shrink tube. Peel off the coating layer of the fiber is very fragile, the use of heat-shrinkable tube, you can protect the fiber fusion head.
③ turn on the Furukawa s176 fusion splicer power, using the pre-set 42 kinds of programs for fusion splicing, and in use and after use in a timely manner to remove the dust in the fusion splicer, especially the clamps, each mirror and v-groove within the dust and fiber broken un. catv use of optical fiber has a conventional single-mode fiber and dispersion-shifted single-mode fiber, the working wavelength is also 1310nm and 1550nm two. Therefore, before fusion splicing, according to the system to use the fiber and working wavelength to choose the appropriate fusion splicing procedures. If there is no special situation, generally choose automatic fusion splicing program.
④Make fiber endface. Fiber endface production will directly affect the quality of splicing, so be sure to do a good job of qualified endface before fusion splicing. Strip the coating layer with special stripping pliers, and then wipe with alcohol cleaning cotton on the bare fiber several times, the force should be moderate, and then cut the fiber with a precision fiber optic cutting knife, 0.25mm (outer coating) fiber, cutting length of 8mm-16mm, 0.9mm (outer coating) fiber, cutting length can only be 16mm.
⑤ Place the fiber. Place the fiber in the v-shaped slot of the fusion splicer, carefully press on the fiber pressure plate and fiber clamps, to set the position of the fiber in the pressure plate according to the fiber cutting length, close the wind shield, you can automatically complete the fusion splicing, only 11 seconds.
⑥Remove the fiber and heat the heat shrink tube with the heater. Open the windshield, remove the fiber from the fusion splicer, then place the heat shrink tube in the center of the bare fiber and put it into the heating furnace. The heater can use 20mm miniature heat shrink tubing and 40mm and 60mm general heat shrink tubing, 20mm heat shrink tube takes 40 seconds, 60mm heat shrink tube is 85 seconds.
⑦Disc fiber fixed. The spliced fiber tray to the fiber shelter tray, in the tray fiber, the larger the radius of the disk circle, the greater the arc, the smaller the loss of the entire line. So be sure to keep a certain radius, so that when the laser is transmitted in the fiber core, to avoid some unnecessary loss.
⑧ Seal and hang up. Field splice box must be sealed to prevent water. After the fusion splice box into the water, due to the fiber and fiber fusion point long-term immersion in water, may first appear part of the fiber attenuation increase. Set the stainless steel hook and hang on the hanging wire. So far, the fiber optic fusion splicing is complete.
