Hello,
Today, I will introduce you the fiber splicing loss and threading techniques.
After the fiber is spliced, a certain amount of loss will occur when the light is transmitted to the connector. It is called fusion loss or splice loss. How to reduce the loss of the fiber splicing connector?
Definition:
After the fiber is spliced, the light transmitted to the connector will cause a certain amount of loss, which is called fusion loss or splice loss.
Cause:
The optical fiber fusion loss is mainly composed of the transmission loss of the optical fiber itself and the fusion loss at the optical fiber fusion splice. Because the quality of fiber connection affects the parameters of fiber line transmission loss, the optical fiber line without relay amplification and other parameters, it is necessary to reduce the fiber fusion splice loss as much as possible to ensure the transmission quality of fiber CATV signals.
So how to reduce the loss of fiber fusion splice? The method is as follows:
1- Try to use the same batch of high-quality brand-name bare fiber on one line
2- Erection of optical cables should be carried out as required
3- Choose experienced fiber optics splicing personnel for splicing
4- The connecting optical cable should be carried out in a clean environment
5- Use a high-precision fiber end face cutter to prepare the fiber end face
6- Proper use of fusion splicer
Threading techniques in wiring
In the wiring project, the level of construction directly affects the performance of the system, and it must be reworked seriously, such as the wrong slotting, the color label on the distribution frame is reversed, and the number is wrong. Among them, the threading technology (Such as cables passing through steel pipes, passing through transition boxes, etc.) are more commonly used technologies. Now we will summarize the more mature experience in this area for your reference.
Threading technology is a relatively common technology in wiring. In order to ensure that the cable is not scratched and cause "short circuit", plastic protection ports must be placed at all steel pipe openings. A feasible method is that the threading personnel should always carry the "protection mouth" during construction, and can be placed at any time when necessary, so as not to be "lazy" because there is no "protection mouth" at hand. When the vertical cable is transferred to the vertical steel pipe through the transition box to the next layer, the suspension must be tied and suspended in the transition box to prevent the weight of the cable from being fully pressed on the inside cable at the corner, because this will affect the transmission characteristics of the cable. Cables in vertical trunking must be tied and hung once per meter. The cables laid in the trunking should be straight, untwisted, and the length should be the same.
Regarding the problem of "residual line", the length of the "residual line" of the cable at the distribution box should be the same, and not too long. It is best to group the remaining wires according to the grouping table, straighten and bundle them from the trunking exit, and the spacing between the binding points is not more than 50cm. It is important to note that you cannot use iron wire or hard power cords.
Regarding the problem of labeling, the cables are labeled according to the computer plan. Each label corresponds to a 4-pair core wire. The corresponding room and socket cannot be mistaken. In implementation, this is the most error-prone place. Experience is that the positions of the labels on both ends are 25cm away from the ends, and light-colored plastic tape is affixed. Use oil-based pens to write the labels or put on paper numbers and then wrap the transparent tape.
In addition, the spare line is generally worn at a rate of 3%, and the spare line is placed in the trunk line trough, with at least one spare line per floor. After the threading is completed, all 4-pair core cables should be fully tested for continuity. The test can use the following method, peel the core of the cable at both ends to expose the copper core. At one end, dial the digital multimeter to the continuity test position. The two test leads are connected to a pair of cable cores. At the other end, the pair of cable cores are frequently and briefly contacted. If you can hear intermittent sound at the meter end, it means that the test is passed, and 4 pairs of cores of each cable must be tested. Through such tests, problems such as disconnection, disconnection, and mislabeling can be found.
During the wiring, it is also necessary to pay attention that when the cables are not put in place after being pulled out of the cable box, if the construction is to be suspended, the cables should be carefully wound and stowed and stored properly. This is a place that many cabling construction teams without standard management often tend to ignore.
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