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How to weld fiber loss will be the lowest?
(1) Optical fiber connection. The principle that optical fiber connection should follow is: when the number of cores is equal, the corresponding color optical fibers in the bundled tube must be connected. When the number of cores is different, the number of cores is larger and the number of connected cores is smaller.
(2) Optical fiber connection methods include: welding, active connection, and mechanical connection. Most of the projects use fusion welding. With this welding method, the contact loss is small, the reflection loss is large, and the reliability is high.
(3) Optical fiber connection process and steps:
1 Open the stripping cable and fix the cable in the splice box. Be careful not to injure the tube, open the stripping length to take about 1m, wipe the ointment clean with toilet paper, and insert the cable into the splice box. When fixing the wire, be sure to press it tightly and do not loosen it. Otherwise, it may cause the cable to roll off the core.
2 Fibers pass the fiber through heat shrink tubing. Different beam tubes, different color fibers are separated and passed through heat shrink tubes. The stripped fiber is fragile and the use of heat shrink tubing protects the fiber fusion splice.
3 Open the Furukawa S176 fusion splicer power supply, use the preset 42 kinds of programs for welding, and remove the dust in the fusion splicer in use and after use, especially the fixture, the dust and fiber in each mirror and V-shaped groove is not broken . The optical fibers used by CATV are conventional single-mode fibers and dispersion-shifted single-mode fibers. The operating wavelengths are also 1310 nm and 1550 nm. Therefore, the proper welding procedure should be selected according to the optical fiber and working wavelength used in the system before welding. If there is no special situation, automatic welding procedures are generally used.
4 Make the fiber end face. The quality of the fiber end face will directly affect the quality of the connection, so you must be qualified before welding. Strip the coating with a special wire stripper, wipe it several times on bare fiber with alcohol-soaked clean cotton, and use moderate force. Then use a precision fiber cleaver to cut the fiber. For 0.25mm (overcoat) fiber, Cutting length is 8mm-16mm, and for 0.9mm (overcoat) fiber, the cutting length can only be 16mm. After cutting, place the fiber carefully in the V-groove of the fusion splicer, close the draft shield, and press the discharge button of the fusion splicer to automatically complete the welding. It only takes 11 seconds.
6 Remove the fiber Heat the heat shrink tube with a heating furnace. Open the windshield, remove the fiber from the fusion splicer, place the heat shrink tube in the center of the bare fiber, and place it in the heating furnace. The heater can use 20mm miniature heat shrinkable tubing and 40mm and 60mm general heat shrinkable tubing, 20mm heat shrink tubing takes 40 seconds, and 60mm heat shrink tubing is 85sec.
7 fiber fixed. The connected fiber optic disk is placed on the fiber receiving tray. When the fiber optic disk is in the fiber, the larger the radius of the disk ring, the greater the arc, and the smaller the loss of the entire circuit. Therefore, we must maintain a certain radius, so that when the laser is transmitted in the core, to avoid unnecessary losses.
8 sealed and hung. The wild renewal box must be sealed to prevent water ingress. After the splice box is filled with water, the long-term immersion in the optical fiber and fiber fusion points may affect the transmission.