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Central loose tube optical-fiber cable

A fiber optic cable and fiber optic cable technology, applied in the field of fiber optic cables, can solve the impractical problems of rigid strengthening members

Active Publication Date: 2017-08-18
PRYSMIAN SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, rigid strength members are impractical for cable configurations that require flexibility and do not have a preferred bending axis

Method used

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  • Central loose tube optical-fiber cable
  • Central loose tube optical-fiber cable
  • Central loose tube optical-fiber cable

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023]

[0024] In Example 1 (above), as between the glass fiber reinforcing yarns and the aramid reinforcing yarns, the glass fiber reinforcing yarns provided about 91% of the tensile strength of the composite reinforcing yarns.

Embodiment 2

[0026]

[0027] In Example 2 (above), as between the glass fiber reinforcing yarns and the aramid reinforcing yarns, the glass fiber reinforcing yarns provided about 68% of the tensile strength of the composite reinforcing yarns.

Embodiment 3

[0029]

[0030] In Example 3 (above), the fiberglass reinforcing yarns provided about 58% of the tensile strength of the composite reinforcing yarns, as between the glass fiber reinforcing yarns and the aramid reinforcing yarns.

[0031] The excess fiber length (EFL) typically varies with the operating temperature of the fiber optic cable (eg, -40°C to 40°C). The inclusion of reinforcing yarns helps control the fiber excess length (EFL) related to the interaction of contraction force and core stiffness not only during buffering but also at extreme temperatures (eg, below -20°C). As noted above, the present fiber optic cables typically achieve an excess fiber length (EFL) of less than 0.3%, more typically less than 0.2% (eg, less than 0.1%) at 23°C.

[0032] In addition, post-extrusion shrinkage (PES), for example during mid-span storage of fiber optic buffer tubes and cables, often contributes to attenuation. Post-extrusion shrinkage that can occur when polymeric buffer tube...

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PUM

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Abstract

The present invention relates to central loose optical-fiber cables. An exemplary optical-fiber cable includes a central buffer tube that encloses loose optical fibers. Stranded strength yarns surround the central buffer tube and the optical fibers positioned within the central buffer tube's annular space, and a cable jacket surrounds the stranded strength yarns.

Description

technical field [0001] The present invention relates to optical fiber cables, particularly central loose tube optical-fiber cables. Background technique [0002] Fiber optics have advantages over traditional communication lines. Fiber optic communication networks can transmit significantly more information at significantly higher speeds than conventional wired networks. Therefore, optical fibers are increasingly used in communication networks. [0003] Optical fibers are often assembled into fiber optic cables, such as central loose tube cables. Such fiber optic cables sometimes include rigid strength members to help the fiber optic cable withstand mechanical stresses incurred during installation and thereafter as a result of thermal expansion and contraction. However, rigid strength members are impractical for fiber optic cable configurations that require flexibility and do not have a preferred bending axis. If a rigid strength member is not included, loose tube fiber o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/44
CPCG02B6/443G02B6/4432G02B6/4433G02B6/4486
Inventor B·G·里施D·科拉多
Owner PRYSMIAN SPA
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