Other methods of splicing are less common, we will not dwell on them.
VIACOM OPTIC company carries out the installation of optical communication lines using a Sumitomo type 35 SE welding machine. This device allows you to weld any type of fiber in manual and automatic modes, tests the fiber before welding, sets the optimal operation parameter, estimates the quality of the surfaces of the fibers before welding, measures the loss at the fiber joints and, if necessary, gives the command to repeat welding. In addition, the apparatus protects the welding site with a special sleeve and checks the strength of the welded joint. The device allows you to weld single-mode and multimode fibers with losses of 0.01dB, which is an excellent result. I would especially like to say about a specially developed technique for assessing the quality of welding. In devices of other designs, such as BICC, the fiber bends, and at the end of the fiber to be welded, laser radiation is detected, which is detected at the end of the second fiber to be welded by the photodetector. With this measurement method, the fiber undergoes excessive bending deformation, which can lead to the formation of cracks in this section of the fiber. Sumitomo takes measurements in a non-destructive way based on the processing of video information using specially developed algorithms.
For some special applications, optical fibers are available with a special sheath coating or with a complex refractive index profile at the core-sheath boundary. In such fibers, it is very difficult to introduce probe radiation in the bending region. For Sumitomo devices, working with special fibers is straightforward. Such devices are quite expensive, but we work on such devices. This achieves two goals:
1) high-quality welding, 2) high speed of work, which is important when fulfilling important orders (urgent liquidation of an accident on a trunk line).
During the installation of the FOCL, the line is tested using an optical reflectometer. According to VIMCOM OPTIC specialists, one of the most adapted devices for these purposes is the Ando AQ7220 mini reflectometer. Lightweight and compact (340x235x100 mm, 4.6 kg with a built-in battery for 3-4 hours of operation), it is especially convenient for working in the field. The device has an internal memory, 3.5 "drive, hard disk (optional).
The increase in sales leads to a significant reduction in the cost of all FOCL components, and new technologies for the construction of optical networks allow the creation of highly reliable telecommunications.
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