OPTICAL FIBRE UNIT, OPTICAL FIBRE BRANCHING METHOD, AND OPTICAL FIBRE CABLE

摘要

[Problem] To improve working properties during extraction of optical-fibre core lines, and to inhibit an increase in transmission loss even if tensile force is exerted on bundling members, in an optical-fibre unit in which the bundling members are used to bundle together a bundle of the optical-fibre core lines. [Solution] This optical-fibre unit is provided with: a plurality of optical-fibre core lines; and at least 3 bundling members for bundling together the plurality of optical-fibre core lines. The optical-fibre unit is characterized in that: a first bundling member among the plurality of bundling members is disposed along a length direction of a bundle of the optical-fibre core lines so as to wind around an outer periphery of the bundle of optical-fibre core lines, is joined to a second bundling member at contact points in contact with the second bundling member, and is joined to a third bundling member at contact points in contact with the third bundling member, said third bundling member being separate from the second bundling member; and, at the contact points with the second bundling member and the contact points with the third bundling member, the winding direction around the bundle of optical-fibre core lines is inverted.