Fiber optic cable into the end of the monitoring method

The quality of splice at the end cannot be monitored

There are three main monitoring methods for monitoring the quality of fiber optic splices,

One is to use the display screen of the splicing machine;

The second is to use the OTDR to monitor the splicing point;

The third is to use the light source, the optical power meter to carry out the fusion splicing loss of the cut or insertion test, but because the cut or insertion are destructive tests, they are not used in the project. insertion test, but because the cut or insertion are destructive test, so in the project is not used.

The following on the first two ways to monitor the discussion: the use of fusion splicer monitoring: fusion splicer is the use of P S A imaging technology, through the image data processing to extract the optical fiber location parameters, to see through the two fusion splicing fiber to the core situation, the fusion part of the connection of the rough estimation. Then, in engineering applications, the termination operator can use this principle to estimate the value of the terminated fusion splice. First, adjust the focus knob of the display screen of the fusion splicer, so that the screen can clearly display the core of the fiber to be fused and the cladding of the light and dark boundaries. Then fusion splicing, pay attention to observe the two optical fiber core and cladding interface, when fusion splicing, fusion splicing point, no bubbles or two optical fiber core, cladding interface to maintain a straight line without distortion, can be considered fusion splicing loss is within the scope of qualification. Otherwise, it is regarded as unqualified and needs to be re-splice.

The use of OTDR to the end of the fusion splicing monitoring, due to the incoming cable D T into the end of the splicing, either T B X method, or O F D method, for the splicing of the tail fiber up to 15 The length is any OTDR blind

Anomalies in the end of the fusion splicing or fusion splicing machine refuses to melt

The end of the fiber optic cable is the end of the fusion splicing method of fiber optic fiber tailing fiber and fiber optic fiber to construct the circuit, with the conventional line cable fusion splicing method, the fusion splicing method, the end of the fusion splicing method. Compared to conventional line cable splicing, the object to be spliced has changed. Some of the time, from the fusion splicer display screen, into the end of the end of the two optical fibers to be fused to the end of the cut are qualified, but the fusion splicing machine on the fiber for the core, but on the screen image processing failure or dust setting fault prompts; and even some of the time, the optical fiber can be fused with the pigtailed optical fiber, but from the display of fusion effect of the screen, you can see the two optical fiber cores in the fusion at the wrong place, or There are air bubbles, and even the fusion point is sunken. The emergence of these bad fusion conditions, often used to line cable fusion splicing technology operators, puzzled. In fact, the cause of the above anomalies is due to the different structure of the pigtail fiber and fiber optic cable caused by. Commonly used pigtail axial diameter is generally 28 mm from the outside to the inside were yellow P jacket, E aramid reinforcing fibers, white secondary coating layer, the primary coating layer of this color, the inner most is to be fused to the bare fiber; while the optical fiber axial diameter of 01 m, .8 m-92 Wanfang data can not be avoided. Along the OTDR loss test four-point method to

Conclusion

The quality of fiber optic cable into the station after the end of the quality of the fiber optic link will have a direct impact on the transmission performance and the quality of the entire system communication. Therefore, it is important to adopt a reasonable and reliable termination method. Especially in the large-scale popularization and application of fiber optic metropolitan area network (MAN), there is an urgent need to standardize the termination process of fiber optic cables. In order to achieve this purpose, the corresponding solution in addition to cable technicians continue to summarize in the project, improve the termination process, there is still a need to T B X cabinet O F -O , D producers will be in the factory through the engineering application to verify the design of its scientific, and in the products are equipped with manuals recommended for use, and further to improve the quality of fiber optic cable communication projects.

The fusion splice point of the loss value of the test, obviously does not work. But instead of using the O R fiber attenuation test D T two-point method can be , to derive the fusion splicing loss. That is, the two test points of OTDR are set to avoid the two Fresnel reflection peaks at the front and end of the OTDR test curve, record the kilometer attenuation value of the fiber under test, and compare its value with the national standard to determine the quality of the end of the splice. In addition, the fiber path in LAN is short, the termination operator can also observe the waveform of backscatter curve of OD. TR is to determine the fusion bonding value of the OD based on the flatness of the waveform from the beginning to the middle of the waveform. If there is no significant step down in the test curve, the fusion value is considered to be acceptable. If there is a step in the test curve, then rewiring is required.