A non-metallic layer stranded optical cable with a reversal point capable of being positioned and a detection method thereof, which solves the problems of determining a reversal point of a cable core and performing an operation of drawing out an optical fiber from the optical cable. The present invention relates to a non-metallic layer stranded optical cable, and the key points of the technical solution thereof includes a cable core and a metal film provided at each reversal point of the cable core, and an outer sheath is provided on the cable core.

Present disclosure provides a method for grouping of a plurality of optical fibers using first coating layer and magnetic coating layer. The method of the present disclosure includes the step of coating of each of the plurality of optical fibers with a first coating layer and the step of coating of each of the plurality of optical fibers with a magnetic coating layer. Further, the method includes the step of applying magnetic field over the plurality of optical fibers for grouping of the plurality of optical fibers in a predefined manner. Furthermore, the first coating layer serves as a shock absorber to protect the plurality of optical fibers from physical damage.

Embodiments of the disclosure relate to an optical fiber ribbon. The optical fiber ribbon includes a plurality of optical fibers arranged adjacently to each other. Each optical fiber has a circumferential outer surface. The optical fiber ribbon also includes a lengthwise continuous coating disposed on at least a portion of the circumferential outer surface of each optical fiber. The coating includes a colorant for identifying the optical fiber ribbon among a plurality of optical fiber ribbons. The coating has a first thickness. Further, the optical fiber ribbon includes plurality of bonds intermittently formed between adjacent optical fibers of the plurality of optical fibers. Each of the bonds has a second thickness that is greater than the first thickness. The plurality of bonds provide the only connection between the adjacent optical fibers of the plurality of optical fibers.

An optical fiber unit according to the present disclosure includes a plurality of intermittently-connected optical fiber ribbons. At least one of the optical fiber ribbons includes a plurality of optical fibers including a first optical fiber, and a second optical fiber that is longer than the first optical fiber. Conditions (AA) and c<0.05 are satisfied, where b is an interval, in a length direction, between connection parts that connect the first optical fiber and the second optical fiber, c (%) is a fiber length difference of the second optical fiber with respect to the first optical fiber, and Y is an interval between the optical fibers in a ribbon width direction. (AA):

[00001]$C>100\times \left\{\sqrt{{\left(\frac{2Y}{b}\right)}^2+1}-1\right\}$

A fiber connected body includes: a first multi-core fiber including a first cladding, first cores disposed in the first cladding, and a first marker disposed in the first cladding; and a second multi-core fiber including a second cladding, second cores disposed in the second cladding, and a second marker disposed in the second cladding. One end surface of the second multi-core fiber is connected to one end surface of the first multi-core fiber. Each of the second cores is connected to any one of the first cores, or each of the first cores is connected to any one of the second cores.

The MCF of the present disclosure suppresses occurrence of structural abnormality such as air bubbles in the vicinity of a boundary between a marker and a cladding. The MCF includes a glass optical fiber including a plurality of cores, a marker, and a cladding, and a resin coating. On a cross section of the MCF, centers of the plurality of cores and a center of the marker constitute a plane figure having a rotational symmetry of order 1 with respect to a center of the cross section. Moreover, on the cross section, the marker is disposed so as to be located on a circumference of a circle having a center coinciding with the center of the cross section and having the circumference passing through the respective centers of the plurality of cores.

Systems and methods for physical cable route tracing are provided. In one embodiment, a cable comprises: one or more of either electrical conductors or optical fibers; a cable sheath around the one or more of either electrical conductors or optical fibers; and a pattern of cable tracing facilitation markings located on an exterior of the cable sheath; wherein the cable tracing facilitation markings comprise either: a visually varying pattern that gradually changes along a length of the cable sheath; or a series of coded markings of an ordered sequence pattern.

An optical fiber cable that includes reduced or minimal use of colorant may include a single optical fiber component and a jacket formed around the optical fiber component. The optical fiber component may include at least one optical fiber and a buffer layer formed around the at least one optical fiber. The buffer laying may include one or more first polymeric materials that are not blended or compounded with any colorant, and no colorant may be formed on an outer surface of the buffer layer. Additionally, the jacket may include or more second polymeric materials that are not blended or compounded with any colorant.

An optical cable includes optical fiber units each of which includes intermittently-coupled optical fiber ribbons. In at least one of the optical fiber units, in a cross section perpendicular to a longitudinal direction of the at least one of the optical fiber units, a length of a vector GU is shorter than a largest length of vectors MG of the intermittently-coupled optical fiber ribbons forming the at least one of the optical fiber units, where, in each of the intermittently-coupled optical fiber ribbons, each of the vectors MG is a vector starting from M and ending at G, M is a midpoint between optical fibers at both ends of the each of the intermittently-coupled optical fiber ribbons, and G is a center of gravity of the each of the intermittently-coupled optical fiber ribbons, and the vector GU is a resultant vector of the vectors MG.

An optical fiber unit includes: a first optical fiber ribbon that intermittently connects a first plurality of optical fibers; a second optical fiber ribbon that intermittently connects a second plurality of optical fibers; and interlayer connection parts that intermittently connect the first optical fiber ribbon and the second optical fiber ribbon in a length direction while the first optical fiber ribbon and the second optical fiber ribbon are layered and arranged. The first optical fiber ribbon and the second optical fiber ribbon are layered and arranged such that optical fibers having a same fiber number of the first optical fiber ribbon and the second optical fiber ribbon are aligned in a up-down direction perpendicular to the length direction.