Full overview of pre-connected fiber optic cables

In the wiring system, the transmission medium is like the road or bridge in the transportation network. The safe operation of all networks and the correctness of the mutual information transmission between various parts must be established on the basis of the safety, stability and reliability of the wiring system. It is crucial that if the reliability of the network wiring components is uncertain, the network operation security based on this will become more unpredictable and guaranteed.

Therefore, the most basic condition for the safe operation of the network is to ensure the safety, reliability and effectiveness of the transmission medium. It is necessary to achieve a high degree of safety and stability of the network wiring connection components and good matching between components, and to reduce the loss of signals as much as possible. As well as providing enough transmission capacity to support the application demands of today and tomorrow.

Since the signal transmitted in the copper cable network is an electrical signal, and the signal transmitted in the optical fiber network is an optical signal, there are many parameters that are different when examining the performance of different network media. However, no matter the electrical signal or the optical signal, Insertion loss, return loss, noise interference, etc. are the main factors that affect network performance, and of course, network performance degradation due to mismatch between connections also belongs to the above factors. Here, we only discuss fiber-optic networks.

In the current general optical fiber cabling network, because the technology and quality of the optical fibers used in the wiring are generally stable, the characteristics of optical cables composed of optical fibers and various optical fiber connectors, jumpers, pigtails and other components are relatively stable. And in the actual use of wiring, they are relatively fixed, so most of the reasons that may actually affect the stability of the optical fiber network are concentrated in the optical fiber connection technology. discuss:

1. Splicing method: Optical fiber fusion splicing is a connection method that is widely used at present. Relatively speaking, fusion splicing is a method with high success rate and connection quality, but it should also be noted that the joint after fusion splicing is relatively easy. One of the main factors of damage or failure, since the maintenance operation of the equipment is necessary in the process of use and maintenance, its safety is a problem that we must consider.

Under normal circumstances, splicing can obtain a small connection loss, generally below 0.2dB, but the return loss is not easy to control, and in the process of fiber splicing, there are many external factors that affect the quality of splicing, such as environmental conditions ( Including temperature, wind, dust, etc.), operation proficiency (including preparation of fiber end face, aging of electrode rods), optical fiber matching (including optical fiber, pigtail type matching, optical fiber manufacturer matching), etc. If the current domestic There are not many multi-core ribbon fiber connectors such as MTP, and the ribbon fiber fusion splicer cannot avoid the reality that the individual fiber loss is too large during the fusion splicing process;

Moreover, experience tells us that the true loss value of fusion splicing can only be obtained through testing. In the case of a large number of fiber cores, it is easy to damage the completed ones. In the testing stage, if the test results are not satisfactory or do not meet the standards, it is necessary to restart the process. Pick them out and rework them; after the network has been used, if the network cabinet or terminal needs to be moved, the fiber link must be interrupted, re-spliced ​​at the new location, etc.; We pay a lot of labor and pay extra attention to the safety of optical fibers when splicing.

2. The method of cold splicing or on-site grinding of optical fiber connectors: Anyone who has been engaged in factory manufacturing and production of optical fiber products should know this very well. On-site grinding and factory manufacturing are two completely different methods that are incomparable. The factory adopts It is a five-step grinding process from coarse to fine by a special grinding machine. It is impossible to adjust the pressure and maintain a consistent manual grinding on site. Perhaps in the traditional low-speed network in the past, even if the insertion loss and return loss exceed the standard, the connection is unstable, etc., it may be acceptable for network applications, because the optical fiber has enough surplus to absorb the impact of these factors. However, in today's increasingly high-performance network, many indicators and parameters are extremely sensitive, because the link fails to meet the design requirements or is time-consuming and labor-intensive, which makes designers or constructors troubled, and the loss exceeds the network design. Requirements, test failures, etc. occur from time to time. As a result, there are consequences such as delays in construction schedules, design changes or re-planning.

Entering the market from pre-connection, it has been applied in the design and construction of optical fiber networks in many telecom operators, finance, education, public security, customs, enterprises, science and technology parks, etc., and has also won high recognition from integrators and end customers. And wide acclaim, make us more confident, we hope more users can have such a fiber optic network with convenient construction, high security and excellent performance, because we always believe that network cabling is one of the most important parts of future applications , With a highly secure and reliable foundation, there will be more exciting and excellent network applications.