Fiber-optical zonal core thread

Abstract

This invention provides an optical fiber ribbon core wire, which can suppress a deterioration in polarized wave mode dispersion and can contribute to an increase in communication capacity in wavelength multiplexed communication, and an optical fiber cable. The optical fiber core wire comprises a plurality of optical fiber core wires (12) which have been bundled, and a ribbon covering layer (13) provided on the circumference of the plurality of optical fiber core wires so that the plurality of optical fiber core wires are integrated with each other. In this optical fiber ribbon core wire, the casing has a glass transition temperature in therange of 80 to 130 C and a Young's modulus in the range of 800 to 2100 MPa. Further, a requirement of 1 < b / a = 2 is always satisfied wherein a represents the thickness of a covering layer coated on the upper side and lower side of the plurality of optical fiber core wires; and b represents the thickness of a covering layer coated on each of outer sides of the optical fiber located on the outermost part in the optical fiber ribbon core wire. The covering layer thickness (a) is not more than 10 [mu]m, and the covering layer thickness (b) is less than 20 [mu]m.

Description

technical field [0001] The present invention relates to an optical fiber ribbon core wire. Background technique [0002] Strict management of dispersion characteristics is required in optical fiber communication technology due to increased capacity represented by wavelength division multiplexing communication in recent years. Therefore, it is the current situation that polarization dispersion characteristics and the like must be managed also for optical fiber cables. [0003] The cross section of the optical fiber is ideally a perfect circle, but actually there is so-called asymmetry in the cross section of the optical fiber such that the circle deviates from a perfect circle or is eccentric. Since the out-of-roundness inside the optical fiber is caused by manufacturing equipment or manufacturing conditions, it tends not to be limited to one section of the optical fiber but to be continuous in the longitudinal direction. When light is transmitted in an optical fiber having...

AI Technical Summary

Problems solved by technology

[0007] Since the asymmetry of the cross-section of the ribbon-shaped core continues in the length direction, and the stresses on each fiber are different, the difference in polarization dispersion caused by these stresses will become larger for each fiber. In the fiber ribbon-shaped core There is a tendency for polarization mode dispersion to deteriorate in optical fiber cables made by concentrating these optical fiber ribbon cores

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