How to reduce fiber splice loss?


As we all know, after the optical fiber is spliced, a certain amount of loss will be generated when the light is transmitted to the joint, and this is called the splice loss or splice loss. So, how to reduce the loss of optical fiber fusion, and what are the threading skills for integrated wiring?


Fiber splice loss

1. How to reduce the loss of optical fiber fusion

1. Try to use the same batch of high-quality brand-name bare fibers on a line;

2. Optical cable erection shall be carried out as required;

3. Select experienced and well-trained optical fiber connection personnel for connection;

4. The optical cable should be connected in a clean environment;

5. Use a high-precision fiber end face cutter to prepare the fiber end face;

6. Correct use of fusion splicer.


2. What are the threading skills of integrated wiring

In the wiring project, the level of construction directly affects the performance of the system, and in serious cases, rework is required, such as wrong slotting, reversed color labels on the patch panel, and wrong numbering, etc. 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 mature experience in this area for your reference.

ftth cable

Threading technology is a relatively common technology in wiring. In order to ensure that the cables are not scratched and cause "short circuits", plastic guards must be placed at all steel pipe ports. A feasible method is that the threader should carry the "mouth guard" at all times during construction, and can place it at any time when needed, so as not to be "lazy" because there is no "mouth guard" on hand.


When the vertical cable is transferred into the vertical steel pipe through the transition box and goes to the next layer, it must be tied and suspended in the transition box to avoid the weight of the cable being fully pressed on the cable on the inner side of the corner, because this will affect the transmission characteristics of the cable. The cables in the vertical trunking shall be tied and hung every meter. The cables laid in the trunking should be straight, without entanglement, and the length should be the same.


Regarding the "remaining line", the length of the "remaining line" at the wiring box should be the same and not too long. It is best to group the remaining lines according to the grouping table, straighten and bind them from the outlet of the trunking, and the distance between the binding points is not more than 50cm. It should be noted that it cannot be tied with iron wire or hard power cord.


Regarding the issue of labels, cables are labeled according to the computer plan. Each label corresponds to a 4-pair core wire, and the corresponding room and socket location cannot be mistaken. In implementation, this is the most error-prone place. The experience is that the position of the label at both ends is 25cm away from the end, and the light-colored plastic tape is pasted, and the label is written with an oil-based pen or a paper number label is attached, and then the transparent tape is wrapped.


In addition, it is generally necessary to wear spare lines according to the proportion of 3%, and the spare lines are placed in the trunk line groove, and there is at least one spare line on each layer. After threading is complete, all 4-pair cables should be fully tested for continuity.


The test can use the following method, strip the cores of the cables at both ends to expose the copper cores. Turn the digital multimeter to the on-off test gear at one end, connect the two test pens to a pair of cable cores, and contact the pair of cable cores frequently and briefly at the other end.


If you can hear intermittent sound at the end of the meter, it means that the test has passed, and the 4 pairs of cores of each cable must be tested. Through such a test, the problems of broken wires, open circuits and wrong numbers can be found.


During wiring, another thing to pay attention to is that when the cables are pulled out of the cable box and have not been laid in place, if you want to suspend the construction, the cables should be carefully wound up and stored for safekeeping. This is a place that is often overlooked by many wiring construction teams without standardized management.


In fact, the reason for the fiber splice loss is mainly due to the transmission loss of the fiber itself and the splice loss at the fiber splice joint. Since the quality of optical fiber splicing affects parameters such as the limit of transmission loss of optical fiber lines and the transmission distance of optical fiber lines without repeater amplification, it is necessary to reduce the loss of optical fiber fusion joints as much as possible to ensure the transmission quality of optical fiber CATV signals.



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