If you know how to do it, there is no problem. If you don't understand, it's better not to connect randomly.
一 . a little suggestion:
1. Since optical fiber is not like ordinary network cables, its connection and cold connection process is more complicated and requires professional tools. If it is not necessary, please do not disassemble or fiddle with these things.
After the installation is completed, these parts must not be pressed or folded to be protected accordingly.
2. The structure of fiber protection is to add two thin steel wires in the outer sheath to improve the tensile performance. The middle one is an optical fiber. This thing is very fragile, and the glass is drawn into filaments to transmit light signals. There is also a coating on the outer layer of the optical fiber, which can reflect light or enhance the strength of the optical fiber.
二 . Optical fiber connection
(1) Optical fiber connection. The principle that the optical fiber connection should follow is: when the number of cores is equal, the corresponding colored optical fiber in the bundle should be connected. When the number of cores is different, please connect the larger number of cores in order first, and then connect the smaller number of cores.
(2) There are three types of optical fiber connection methods: fusion splicing, movable connection and mechanical connection. Welding methods are mainly used in engineering. Using this welding method, the contact loss is small, the reflection loss is large, and the reliability is high.
(3) Process and steps of optical fiber connection:
A. Strip the optical cable and fix it in the junction box. Be careful not to damage the binding tube. The stripping length is about 1m, wipe the ointment with toilet paper. Pass the fiber optic cable through the connector box. When fixing the steel wire, the steel wire must be tightly pressed and not loosened. Otherwise, the fiber optic cable may roll and break the core wire.
B. Separate the fibers through a heat shrinkable tube. Separate different bundle tubes and optical fibers of different colors, and make them pass through heat shrinkable tubes. The fiber with the coating removed is very fragile, and the use of heat shrinkable tube can protect the fiber splicing.
C. Turn on the power of the Furukawa S176 fusion splicer, use the preset 42 procedures for splicing, and promptly remove the dust in the fusion splicer after use, especially the dust and broken fibers on the frame, mirror and V. Shaped grooves. . The fiber used by catv includes traditional single-mode fiber and dispersion-shifted single-mode fiber. The working wavelengths are 1310nm and 1550nm, respectively. Therefore, before splicing, you should choose the appropriate splicing procedure according to the fiber and working wavelength used by the system. If there are no special circumstances, automatic welding procedures are usually used.
D. Fabricate the fiber end face. The quality of the fiber end face will directly affect the splicing quality, so a qualified end face must be manufactured before welding. Use a special wire stripper to peel off the coating, then wipe the bare fiber with a moderate force with a clean cotton cloth dipped in alcohol several times, and then cut it with a precision fiber cleaver. For 0.25mm (outer coating) fiber, the cutting length is 8mm-16mm. For the 0.9mm (outer coating) fiber, the cutting length can only be 16mm.
E. Place the optical fiber. Put the optical fiber into the V-shaped groove of the fusion splicer, carefully press down the optical fiber clamp and the optical fiber clamp, set the position of the optical fiber in the optical fiber clamp according to the cutting length of the optical fiber, close the windshield and perform the fusion splicing can be completed automatically, only It takes 11 seconds.
F. Pull out the optical fiber and heat the heat shrinkable tube with a heating furnace. Open the windshield, take the optical fiber out of the fusion splicer, then place the heat shrink tube in the center of the bare optical fiber, and then heat it in a heating furnace. The heater can use 20mm micro heat shrink tube and 40mm and 60mm ordinary heat shrink tube. A 20mm heat shrinkable tube takes 40 seconds, while a 60mm heat shrinkable tube takes 85 seconds.
fixed fiber. Roll the spliced optical fiber onto the optical fiber receiving tray. When coiling an optical fiber, the larger the coil radius, the larger the arc, and the smaller the loss of the entire wire. Therefore, when transmitting laser light in the fiber core, a certain radius must be maintained to avoid unnecessary loss.
G. Seal and hang up. The external filling box must be sealed to prevent water ingress. After the fusion splice box enters the water, the attenuation of some optical fibers may first increase due to the long-term immersion of the optical fiber and the optical fiber fusion splice in the water. Put on a stainless steel hook and hang it on the hanging wire. At this point, the optical fiber splicing is completed.
