Optical fiber ribbon core and method for manufacturing the same

Abstract

Provided is an optical fiber tape core which has an identification region for identification and whereby optical transmission loss hardly occurs even when housed in a cable at high density. An optical fiber tape core (1) that solves the abovementioned problem has: a plurality of single-core coated optical fibers (2) arranged in parallel; and a plurality of connecting sections (4) arranged between the adjacent single-core coated optical fibers (2). The optical fiber tape core (1) has an identification region (D) in which a plurality of dots (9) are arranged on the single-core coated optical fibers (2) and / or the connecting sections (4). When the identification region (D) is viewed in a plan view, the ratio of the total area of the dots (9) arranged on the single-core coated fibers (2) with respect to the area of each of the single-core coated optical fibers (2) is 20% or less.

Claims

1. Multiple single-core coated optical fibers arranged in parallel, An optical fiber ribbon cable having a plurality of connecting portions arranged between adjacent single-core coated optical fibers, The single-core coated optical fiber and / or the connecting portion have an identification area in which a group of dots are arranged. The identification region is the area enclosed by two straight lines drawn in the width direction of the optical fiber ribbon core, so as to be tangent to the outermost lengthwise side of the dot among the group of dots, and by both ends of the optical fiber ribbon core in the width direction. In the optical fiber ribbon core, the identification area and the non-identification area where the dots are not placed are arranged alternately. When the identification region is viewed from above, the ratio of the total area of ​​the dots arranged on each single-core coated optical fiber to the area of ​​each single-core coated optical fiber within the identification region is 20% or less. The identification region includes a separation portion between adjacent single-core coated optical fibers where the connecting portion is not located, and the dots straddle two adjacent single-core coated optical fibers, leaving a margin at the widthwise end opposite to each separation portion. Optical fiber ribbon cable.

2. In the optical fiber ribbon cable according to claim 1, An optical fiber ribbon cable in which, when the identification region is viewed from above, the ratio of the total area of ​​the dots arranged on each single-core coated optical fiber to the area of ​​each single-core coated optical fiber is 15.6% or less.

3. In the optical fiber ribbon cable according to claim 1 or 2, An optical fiber ribbon core having multiple of the aforementioned identification regions.

4. A step of preparing a tape-shaped core wire having multiple single-core coated optical fibers arranged in parallel, and multiple connecting portions arranged between adjacent single-core coated optical fibers, A method for manufacturing an optical fiber ribbon core, comprising the step of dropping ink onto the single-core coated optical fiber and / or the connecting portion of the ribbon core by an inkjet method to form an identification area in which a group of dots are formed, The identification region is a region enclosed by two straight lines drawn in the width direction of the optical fiber ribbon core so as to be tangent to the outermost lengthwise dot of the group of dots, and by both ends of the optical fiber ribbon core in the width direction, and includes a separation portion between adjacent single-core coated optical fibers where the connecting portion is not located. In the optical fiber ribbon core, the identification area and the non-identification area where the dots are not placed are arranged alternately. In the step of forming the identification region, when the identification region is viewed from above, the ink is dropped such that the ratio of the total area of ​​the dots formed on each single-core coated optical fiber to the area of ​​each single-core coated optical fiber within the identification region is 20% or less, and the dots are formed across two adjacent single-core coated optical fibers, leaving a margin at the widthwise end opposite the separation portion of each fiber. A method for manufacturing optical fiber ribbon cores.

5. In the method for manufacturing an optical fiber ribbon core according to claim 4, A method for manufacturing an optical fiber ribbon core, wherein in the step of forming the identification region, the ink is dropped such that, when the identification region is viewed from above, the ratio of the total area of ​​the dots formed on each single-core coated optical fiber to the area of ​​each single-core coated optical fiber is 15.6% or less.

6. In the method for manufacturing an optical fiber ribbon core according to claim 4 or 5, A method for manufacturing optical fiber ribbon cores that forms multiple identification regions.

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