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Application of FT-Dry dry optical cable

  • Categories:Industry news
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  • Time of issue:2020-06-12 08:54
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(Summary description)FT-Dry all-dry optical cable is the first domestic and international advanced new optical cable product. It uses new materials and processes, and the weight and cost of the optical cable are reduced. The minimum bending radius of the loose tube is less than 10mm, and it has good bending resistance. , Can meet the higher requirements of users in the construction connection; the innovative dry water blocking technology shortens the time required for the installation and termination of the optical cable, and can effectively improve the convenience of construction connection; the environmental performance, mechanical performance, The water blocking performance can meet the requirements of relevant standards, ensuring the safe use of optical cables and the stability of optical fiber transmission quality.

Application of FT-Dry dry optical cable

(Summary description)FT-Dry all-dry optical cable is the first domestic and international advanced new optical cable product. It uses new materials and processes, and the weight and cost of the optical cable are reduced. The minimum bending radius of the loose tube is less than 10mm, and it has good bending resistance. , Can meet the higher requirements of users in the construction connection; the innovative dry water blocking technology shortens the time required for the installation and termination of the optical cable, and can effectively improve the convenience of construction connection; the environmental performance, mechanical performance, The water blocking performance can meet the requirements of relevant standards, ensuring the safe use of optical cables and the stability of optical fiber transmission quality.

  • Categories:Industry news
  • Author:
  • Origin:
  • Time of issue:2020-06-12 08:54
  • Views:
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FT-Dry all-dry optical cable is the first domestic and international advanced new optical cable product. It uses new materials and processes, and the weight and cost of the optical cable are reduced. The minimum bending radius of the loose tube is less than 10mm, and it has good bending resistance. , Can meet the higher requirements of users in the construction connection; the innovative dry water blocking technology shortens the time required for the installation and termination of the optical cable, and can effectively improve the convenience of construction connection; the environmental performance, mechanical performance, The water blocking performance can meet the requirements of relevant standards, ensuring the safe use of optical cables and the stability of optical fiber transmission quality.

 

1. Research background

Water blocking performance is an important indicator of optical cables. Water can not only cause water peak attenuation of optical fibers, but also cause optical fiber breakage through penetration corrosion. Under humid conditions, it brings potential danger to communication systems and even business interruption. At present, the loose tube structure optical cable in the domestic market can be divided into two types: ointment-filled type and semi-dry type according to the water blocking form. Ointment-filled type refers to the loose tube filled with fiber paste and the cable core gap filled with cable paste (as shown in the figure 1a); semi-dry means that the loose tube is filled with fibrous paste, and the cable core gap uses dry-type water-blocking materials such as water-blocking yarn and water-blocking tape to meet the water-blocking requirements (see Figure 1b).

The water-filling and water-blocking measures adopted by the traditional loose tube optical cable are to fill all the spaces in the tube in the optical cable with the water-blocking oil paste to achieve the water-blocking effect. The ointment has excellent thixotropy and water resistance, and can play a good role in buffering, shockproof and waterproofing the optical fiber. Therefore, in recent years, the company's R&D personnel have focused on the market demand and concentrated on the process of fully dry loose tube optical cable Research, on the basis of the successful launch of the fully dry PBT loose tube optical cable in the early stage, new materials were introduced, dry tube with good bending resistance was developed, and the optical cable structure was optimized in series, which was launched The more advanced and softer FT-Dry dry optical cable has become the first domestic optical cable manufacturer successfully developed and supplied in batches with domestic equipment, which also embodies the advanced technology concept possessed by YOFC as an industry benchmark and strong R&D strength.

In field cables, grease-filled and semi-dry cables have been widely used. However, with the continuous deepening of the construction of the access network, fiber to the home has become more and more common. Since both the grease-filled and semi-dry optical cables contain grease, the grease-filled optical cables must be cleaned during the construction process, and the optical fiber core and optical fiber need to be cleaned with the help of a cleaning agent. This pair of wiring cables and connectors with many connectors The construction of household optical cables brings many troubles, such as: pollution of cleaning agents and cleaning papers, increasing construction time and construction costs. The development of technology and the need of application have resulted in the full dry loose tube optical fiber cable without grease filling. This kind of optical cable completely abandons the traditional grease filled water blocking method, and it is both in the loose tube and cable core of the optical cable. The use of dry water-blocking materials has many advantages such as environmental protection, light weight, grease-free wiping, easy peeling, easy connection, etc., which can meet various network construction requirements and greatly improve the construction connection efficiency.

 

2. Introduction of FT-DRY optical fiber cable

The so-called all-dry optical cable is naturally an optical cable that does not contain grease, and usually refers to an outdoor optical cable or an indoor and outdoor dual-use optical cable; broadly speaking, except for a loose tube structure optical cable that is not filled with grease, a water blocking tape water blocking process is used The skeleton type optical cable can also be classified into this category, and the tight sleeve optical cable is generally not within the scope of the discussion.

 

 

As early as more than ten years ago, YOFC launched a completely dry skeleton fiber optic ribbon cable in China, and developed unique products such as six-core ribbon series and FTTH series in combination with market reality, which are widely used in Metropolitan area networks and access networks have been fully recognized by users.

Compressed in the state, the material crystallizes more fully, the loose tube is very stable, does not shrink after cooling, and the residual length of the fiber in the tube is well controlled. At the same time, the gas filling can be used to control the diameter of the loose tube.

 

3. Performance of FT-DRY optical fiber cable

The FT-Dry full-dry optical cable is controlled by precise excess length to ensure that the optical fiber will not be subjected to excessive stress when the sleeve is expanded and contracted with temperature changes or when the optical cable is subjected to tensile load. According to IEC60794, Telcordia GR-20, YD/T 901-2009 and other industry standards and the general requirements of fiber optic cables, the performance of all dry optical cables is tested, which meets or exceeds the requirements of relevant standards.

 

 

FT-Dry all-dry optical fiber cables are placed in a loose tube containing optical fibers with special water-swellable water-blocking materials to provide good water-blocking capacity. It is a mixture of delicate superabsorbent powder and resin matrix, which will swell rapidly when contacted with water, and can absorb 50~100 times its own weight of moisture, thereby preventing further penetration and migration of water and ensuring the resistance of the optical cable Water performance. And how to ensure the diameter and roundness of the sleeve without grease, and the stable control of the remaining length of the optical fiber have become the difficulty of the dry loose tube production process, which is also the need for us to develop FT-Dry full dry optical cable The main problem solved. Due to the fast cooling speed of the loose tube and incomplete crystallization, it will shrink after cooling, which is more obvious when there is no grease filling, so it is difficult to control the excess length of the fiber in the tube, especially after shrinking This problem is more prominent when producing casings from larger materials. To this end, special process methods are used to make the casing hot

 

The ointment-free filling makes the use and connection of fully dry loose tube fiber optic cables more convenient. The grease-filled optical cable must be cleaned to clean the cable core and the optical fiber during the construction connection. This process is quite time-consuming; while for the completely dry optical cable, the user only needs to use scissors to quickly and easily It is taken out, for example, if the optical fiber is passed through the buffer sleeve and then terminated, because there is no grease on the surface of the optical fiber, it will not be bonded to each other during the bifurcation process, and the connection operation is also simplified, preparation for installation, preparation of optical fiber cable The time required for work and cleaning up will be significantly reduced. In addition to the above advantages, the FT-Dry dry-type optical cable we developed is softer than the general optical cable, especially the sleeve has better bending resistance, and its minimum bending radius is less than 10mm, which can be directly coiled in the splice box. Will not bend, can well meet the higher requirements of customers in this regard in the connection operation.

 

 

Compared with the traditional paste-filled ADSS optical cable, the fully dry ADSS optical cable that has been applied in some countries not only has convenient construction connection, but also reduces the weight and load of the optical cable, which can better ensure its stable performance and safe use. , Also help increase its span. In the domestic market, people are usually accustomed to filling optical cables with traditional ointments. The application of fully dry optical cables needs more publicity. The company has made some efforts in this regard. In addition to exporting the FT-Dry dry optical cable produced by us to foreign markets, we have also conducted a number of pilot projects in cooperation with operators in China (the following figure shows the construction of overhead and pipeline laying respectively Scenes). The once-less-known skeleton optical fiber ribbon cable has now occupied a place in the domestic mainstream market. We believe that the dry-sleeved fiber optic cable with broader application prospects will have more room for development.

 

5. Conclusion

As a leader in the optical fiber and cable industry, YOFC always adheres to talents, mechanisms, and concepts as important elements of the company's innovation culture, continuously promotes technological innovation of products, and actively explores new markets to maintain its core technology leadership. FT-Dry all-dry optical cable series products

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