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Optical conductor and its method of manufacture

a technology of optical conductors and conductors, applied in the field of optical conductors and their methods of manufacture, can solve the problem of not modifying the moisture-absorbing properties

Inactive Publication Date: 2001-11-29
ALCATEL CABLE FRANCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been observed that exposure to ultraviolet radiation for curing purposes does not modify the moisture-absorbing properties of the additives.

Method used

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  • Optical conductor and its method of manufacture
  • Optical conductor and its method of manufacture
  • Optical conductor and its method of manufacture

Examples

Experimental program
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Embodiment Construction

[0020] FIG. 1 shows the results of tests performed on optical fibers into which light was injected at a wavelength of 1550 nanometers (nm).

[0021] FIG. 1 is a graph showing how the attenuation of the optical fiber (expressed in dB / km and plotted up the ordinate) varies as a function of time (expressed in days and plotted along the abscissa). The tests were performed at six different concentrations of additive.

[0022] In all cases, testing was performed on a ribbon of four optical conductors immersed in water at a temperature of 60.degree. C. The resin used was that referenced 9-75 from DSM to which there was added the carbodiimide additive known as "stabaxol 1" from Rhein-Chemie.

[0023] Curve 10 corresponds to a polymer resin having no additive. Curve 11 corresponds to a polymer resin with 0.5% additive. Curve 12 relates to additive at a concentration of 1%. Curve 13 to a concentration of 1.5%, and curves 14 and 15 to concentrations of 2% and 5%, respectively.

[0024] In all cases, atten...

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Abstract

An optical conductor comprises a fiber, in particular a glass fiber, surrounded by a protective polymer material of the UV-curable type. The protective polymer material contains a water-absorbing additive, preferably a carbodiimide, a poly-carbodiimide, or a polyurea. When the additive is based on carbodiimide, it opposes photodegradation.

Description

[0001] The invention relates to an optical conductor comprising a fiber, in particular a glass fiber, surrounded by a protective polymer material.[0002] Optical fiber cables are being used more and more commonly for signal transmission, in particular for telecommunications, because of the large passband and the low sensitivity to noise of optical transmission.[0003] Optical conductors are often disposed in a hostile environment. In particular, optical conductors are subjected to moisture and to large temperature variations.[0004] It has been observed that the polymer resins of optical conductors subjected to a hostile environment, in particular a moist environment, are subject to degradation which makes the polymers brittle, leading to the glass fiber becoming stripped and even, in extreme cases, to the conductor breaking.[0005] These defects come from hydrolysis, which causes the molecules of the polymer to separate under the influence of water and which thus modifies the physical ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G02B6/44C03C25/10C03C25/106
CPCC03C25/106
Inventor NUTT, CHRISTOPHER MCBONCOMPAIN, VALERIE
Owner ALCATEL CABLE FRANCE