Polygon arranged central tube type optical fiber ribbon cable

Abstract

The invention discloses a central tube strip optical cable in a polygon arrangement, comprising a fiber ribbon group in the center and a loose tube which wraps the fiber ribbon group; the fiber ribbon group is formed by the superposition of a plurality of fiber ribbons and every fiber ribbon is formed by parallel combination of a plurality of fibers; the number of the fibers of every fiber ribbon decreases gradually from the inside to the outside; the fiber ribbon which is positioned on the inner layer and has the largest number of fibers has at least two layers; the number of the fiber of the fiber ribbon which is positioned in the outer layer and has the smallest number of fibers is two; after superposition of fiber ribbons, the section of the fiber ribbon group is a polygon. In the optical cable, the fibers at the edge or the corner are stressed uniformly and the distance from the tube wall is widened, thereby reducing signal weakening and improving service performance.

Description

technical field [0001] The invention relates to a central tube type ribbon optical cable arranged in a polygonal shape. Background technique [0002] In the prior art, the central tube type ribbon cable includes an optical fiber ribbon set in the center, a loose tube covering the optical fiber ribbon set, fiber paste is filled between the loose tube and the optical fiber ribbon set, and the loose tube is wrapped Covered with a water-blocking tape, the water-blocking tape is covered with a steel-plastic composite tape, and the steel-plastic composite tape is covered with an outer sheath. The optical fiber ribbon group is composed of several optical fiber ribbons. Each optical fiber ribbon is composed of the same number The optical fibers are combined side by side, and the optical fiber ribbon group can be covered in the loose tube after being twisted. Therefore, the cross section of the optical fiber ribbon group in the loose tube is rectangular. In this way, the optical fibe...

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Problems solved by technology

[0002] In the prior art, the central tube type ribbon cable includes an optical fiber ribbon set in the center, a loose tube covering the optical fiber ribbon set, fiber paste is filled between the loose tube and the optical fiber ribbon set, and the loose tube is wrapped Covered with a water-blocking tape, the water-blocking tape is covered with a steel-plastic composite tape, and the steel-plastic composite tape is covered with an outer sheath. The optical fiber ribbon group is composed of several optical fiber ribbons. Each optical fiber ribbon is composed of the same The optical fibers are combined side by side, and the optical fiber ribbon group can be covered in the loose tube after being twisted. Therefore, the cross section of the optical fiber ribbon group in the loose tube is rectangular. In this way, the optical fiber at the corner position is due to twist Due to the influence of force bending, close distance from the pipe wall and other factors, the signal attenuation is relatively large, which greatly reduces the performance of the optical cable

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