What are the common problems of indoor and outdoor optical fiber? Usually in integrated wiring, we will encounter the laying of indoor and outdoor optical fibers, and indoor and outdoor optical fiber cables are mainly used in the laying of horizontal subsystems and vertical backbone subsystems. So, what are the technical requirements for indoor and outdoor optical fiber laying in weak current projects?
What are the technical requirements for indoor and outdoor optical fiber laying
The laying of indoor optical fibers is to prevent sagging or slipping, and the optical cables must be firmly fixed at the upper, lower and middle ends of the channels on each floor. Usually, nylon cable ties or steel clips can be used for effective fixing.
Finally, oilseed sealing materials should be used to block and seal all the slots and pipe holes where the optical cables pass through in each floor of the building, and fire prevention measures such as adding fireproof materials should be taken to achieve the effect of moisture resistance and fire prevention.
When laying the optical cable, an appropriate length should be reserved according to the design requirements. Generally, 5m -10m should be reserved at the equipment end, and it can be extended appropriately if there are special requirements.
The laying of outdoor optical fibers is divided into the laying of duct optical cables and the laying of direct buried optical cables.
Outdoor optical fiber for weak current engineering
Laying of duct cables
Clean and try it out.
Before laying the optical cable, the tube holes should be cleaned and tested section by section. When cleaning, use a special cleaning tool, and use a test stick for a test pass inspection after cleaning. The inner diameter of the plastic sub-tube should be 1.5 times the outer diameter of the optical cable. When laying more than two sub-pipes in a cement pipe hole, the equivalent total outer diameter of the sub-pipes should be less than 85% of the inner diameter of the pipe hole.
What are the common problems in the process of laying optical fiber
During the use of the optical fiber fusion splicer, when the optical fiber is automatically calibrated, one optical fiber keeps moving up and down, and the screen display stops at "calibration". At this point we need to press the "Reset" button to reset the system.
Then, check whether the position deviation of the optical fiber end face in the Y/Z direction is less than 0.5 mm, if it is less, perform the following operations, otherwise send it to the factory for repair or check whether the bare fiber is clean, if it is not clean, deal with it; then clean the inside of the V-shaped groove Deposited dust. Finally, lightly tap the small indenter with your fingers to determine whether the small indenter has compacted the optical fiber, and if not, deal with it. You can try again.
Secondly, when the optical fiber fusion splicer performs discharge splicing, the discharge program (1——5) set by the factory is not available, and the overall size is too large or too small. This is due to aging of the electrode, changes in the relative position of the optical fiber and the arc, or major changes in the operating environment. They are dealt with as follows:
1. The condition of electrode aging. Check whether the tip of the electrode is damaged, if not, perform the "clean electrode" operation. If the tip of the electrode is damaged, refer to <Maintenance and Repair> to replace the electrode.
2. The relative position between the optical fiber and the arc changes. Enter the "Maintenance Mode" menu, press "Arc Position", open the windshield to observe the relative position of the optical fiber and the arc, if the optical fiber is not in the middle of the arc, you can perform several "clean electrodes" operations, and then observe whether the relative position of the optical fiber and the arc changes. If it does not change, it is a stable position.
3. The operating environment has changed a lot. The processing procedure is as follows: a. Carry out the discharge experiment until three to five consecutive "discharge currents are moderate". b. Enter the discharge parameter menu and check the discharge current value. c. The overall translation current (pre-melting current, welding current, repairing current), so that the value of "welding current" is "138 (0.1mA)". d. Press the "Parameter" key to return to the first-level menu state. e. Take the current translation amount in 3>, and modify the value of the "current deviation" item in the opposite direction. f. After confirming that it is correct, press the "confirm" button to store. g. Press the "parameter" key to exit the menu state.
In addition, when splicing multimode fibers, bubbles always appear during the discharge process. In this case, it is mainly due to the large core refractive index of the multimode fiber. The specific processing process is as follows:
First, take the factory-set multi-mode discharge program as a template (that is, set the value of the "discharge program" item to less than "5", and confirm.
Second, carry out the discharge experiment until "moderate discharge current" appears three times.
Third, perform multi-mode optical fiber splicing. If bubbles still appear, modify the discharge parameters. The modification process is as follows: a. Enter the discharge parameter menu. b. Experimentally increase the value of "premelting time" with a step of 0.1s. c. To connect the optical fiber, if there are still bubbles, continue to increase the "pre-melting time" value until there are no bubbles during the connection (provided that the quality of the fiber end face meets the requirements). d. If there is no bubble in the splicing process and the fiber becomes thinner, the "pre-melting current" needs to be reduced.
