Optical fiber connection method
There are many methods of fiber optic connection. At this stage, the arc welding method is the most superior and the most widely used. The arc welding method utilizes the melting properties of the optical fiber at high temperatures and the high-temperature arc principle of high-voltage tip discharge to fuse the optical fibers. At present, the fusion splicer produced uses image processing technology to automatically set the end position of the optical fiber. Single-mode optical fiber automatic centering and automatic welding, by switching the picture tube picture, you can observe the vertical and horizontal aspects of the two sides of the optical fiber and welding. The splice loss can also be estimated and displayed based on the mandrel deviation and inclination.
When performing fiber optic connection, generally follow the following procedure:
(1) A heat-shrinkable tube with a steel wire for reinforcing the joint portion of the optical cable is previously placed on the optical fiber;
(2) Remove the coating layer, quickly clamp off the primary and secondary coating layers of 20mm--30mm length with an applicator clamp on the fiber, wipe the fiber with a cotton ball or lens paper soaked in alcohol, and wipe the fiber core. Clean, and pay attention to the surface of the fiber should not have cracks, scratches.
(3) Cut the optical fiber and make the end face. In the optical fiber connection, the production of the optical fiber end face is the most critical process. The perfection of the fiber end face determines one of the important reasons for fiber splice loss. It requires that the prepared end face is smooth, free of burrs, and has no defect, and is perpendicular to the axis, and presents a smooth and smooth mirror area, which is kept clean and avoids dust pollution. There are three methods for preparing the end face. One is the notch method. A mechanical cutting knife is used. A diamond knife is used to scratch the surface perpendicular to the direction of the optical fiber. From the coating layer 10, lightly touch the optical fiber. On the natural fracture, the second is the cutting forceps method, which uses a homemade hand-held pliers for cutting operations. The third is ultrasonic electric cutting method. These three methods are very good as long as the appliance is excellent and the operation is proper.
(4) The two fibers to be connected are placed in a fusion splicer for welding, which is automatically performed by the fusion splicer.
(5) Perform several performance evaluations with the OTDR meter after the connection performance test is completed, and then perform the reinforcing protection of the connection part, ie, heat shrinkable heat-shrinkable tube with steel wire.
(6) Finally, after all the cores have been connected, they are collected in the containment tray and retested using the OTDR meter. The disqualifications are to be re-accepted or reconnected until they are qualified.
Cixi Diming Communication Equipment Factory specializes in the supply of telecommunications, mobile, China Unicom, China Railcom, Broadcasting and Television products. The products are as follows:
Optical Distribution Series ( ODF ): SC Quick Connector, Fiber Cold Connector, Fiber Optic Desktop Box, Fiber Optic Panel, Optical Cable Transfer Box, Fiber Optic Gateway Box, Optical Splitter Box, Fiber Optic Adapter, Splicing Fiber, Fiber Optic Patch Cable, Tail Fiber, ODF distribution box, optical fiber cable connector box, multimedia information box, optical fiber home information box, terminal box, optical fiber distribution unit, optical fiber distribution frame (cabinet), etc.
Total with series (MDF): 10 loop security arrangements, 16 loop security arrangements, 25 loop security arrangements, 36 back to the test row 100 loop security arrangements, 128 loop test row, various types of security units, alarm devices , The main distribution frame. Various types of security units, alarms, main distribution frames (cabinet).
Number matching series ( DDF ): imitation Siemens digital distribution frame, imitation NEC digital distribution frame, coaxial connector.
Integrated wiring products: network patch panels, cable management racks, 110 jumper racks, over 5 types, 6 types of modules, information panels, card connection modules, Cologne modules, distribution boxes, network and communication tools and other communication products.
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Single-mode optical fiber splice loss index is generally set at 0.08dB. In construction, indicators can be specified according to actual conditions, but generally not more than 0.08dB.
Optical fiber splice loss is caused by the imperfection of the connection point, which affects the imperfections of the connection point. There are two major categories, ie external and internal factors. The internal cause is the imperfection of the optical fiber itself. It can not reduce the loss by improving the connection process. It includes the core diameter mismatch, refractive index distribution mismatch, poor concentricity of the optical fiber, mismatch of the mode field diameter, so in the continuity test, the continuity loss Values will appear to be positive and negative. Through multiple connections, the unidirectional value can only be smaller, and the average value tends to zero. However, the positive and negative phenomena cannot be avoided. The positive and negative phenomena have a certain influence on the optical fiber transmission loss. In the project, the optical fiber cable should try to use the same factory-supplied optical fiber cable as far as possible, A, B end as much as one-to-one correspondence, artificial continuous process to reduce the connection loss.
External factors refer to the fact that the non-optical fiber itself is not perfect, but is caused by a bad connection process, including deviations of the core position in the horizontal, vertical, and axial directions of the optical fiber, and contamination of the optical fiber end face. This is due to the fact that the maintenance of the splice machine is not timely during the connection process. Inadequate operation and other human factors cause excessive loss of connection.
Here we mainly talk about the common problems and preventive measures in connection with the Japanese Fujikura automatic welding machine as an example, the core position of the lateral deviation, longitudinal deviation, axial angle deviation is due to the dislocation of the electrode, the welder focus is not good Before the start of connection, the mode field experiment can be performed first, and the mode and various parameters suitable for connecting the fiber to be connected can be selected. Then perform various maintenance inspections on the maintenance menu of the fusion splicer, such as driving recovery program maintenance, adjusting the focusing state of the fusion splicer; dust inspection and maintenance, cleaning the lens, electrode and other dust pollution of the fusion splicer; discharge experiment of the electrode position, come Adjust the proper electrode position.
In the process of fiber fusion welding, the three parameters of discharge time, discharge intensity and advancing amount are important factors that can not be ignored, and directly affect the mechanical strength and loss of the fiber joint. The length of the discharge time is proportional to the strength of the fiber joint, but If the time is too long, the optical fiber will be aged due to high temperature. Therefore, taking into account both, the discharge time is usually controlled at 2--5S. The discharge intensity should also be selected properly. If the intensity is too strong, the optical fiber will be deteriorated. If the fiber is too weak, the optical fiber connection will not be completed successfully, which will affect the connection loss. Usually, the value is determined according to the actual situation, which is generally between 45-65. The amount of advancement means that when the optical fiber is placed in the fusion splicer, the optical fiber must be pushed along with the fusion of the optical fiber. A large amount of advancing causes the optical fiber connector to be thicker, and the smaller the connector, the finer the joint. General propel volume control 15 - 20μm range. Through the appropriate selection of these values, the purpose of reducing the connection loss is achieved.
Secondly, the renewal personnel must strictly meet the requirements and strictly follow the operating specifications and operating procedures. If the fiber is placed, the position must be properly placed, and the distance between the fiber and the electrode is too large or too small to be connected. When the connection of a fiber is completed, it is necessary to wait for the screen to show recovery after the standby. After opening the cover, remove the optical fiber; After the tube, it must wait for it to cool before it is taken out and so on.
Finally, it is worth noting that the heat-shrink tubing should also be clean, clean, and dust-free. Otherwise, the dust will damage the continuation point and cause the loss to increase. When storing in a containment tray, try to harvest a large circle to avoid the loss caused by the small circle. The optical fiber in the containment tray must be fixed with tape so that it can not appear to be on the trend to prevent future damage.
Rocker Arms
Rocker arm surrounds hollow shaft. Plug both ends with screw or iron three. The circumference of the shaft is provided with oil holes respectively and the cylinder head oil pasغير مجاز مي باشدe supporting seat oil port. The rocker arm is usually unequal to amplify the valve lift
Rocker arm is to drive the valve to open and close the action, if it is CAM direct drive without rocker arm, in the overhead engine is mostly CAM direct drive.
Rocker Arms,Rocker Roller Arms,Rocker Roller,Rocker Arm Control Valve
YUHUAN CITY KANMEN DONGHAI AUTO PARTS FACTORY (GENERAL PARTNERSHIP) , https://www.donghaiqituo.com
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