Tensile testing of fiber optic cable selection

Tensile properties of the problems and solutions

The fiber optic cable in the course of the main forms of force is the tensile strength, tensile properties of fiber optic cable is the most important mechanical properties. Which led to stretch additional attenuation of the main reasons for failure is lack of fiber excess length. The so-called fiber excess length refers to the relative elongation when the fiber optic cable stretching from the normal state, the fiber optic cable to fiber optic cables by the tensile strain. Commonly used in central tube fiber optic cable and fiber excess length of stranded cable is generally controlled at 0.2% to 0.3%. If there is not enough I long, when the fiber optic cable by a certain tension, we should not force the fiber will also have to strain to affect performance. Of course, I long for too long can lead to fiber bending is too large, causing attenuation increases as well as anti-side pressure drop performance.

Fiber excess length formed in the secondary coating processes, shown in Figure 1. Fiber from the line to put shelves in certain off tension release, the extruder head, squeezed into the PBT beam tube, the tube filled with the ointment, and then through the temperature sink cooling molding, traction wheel by the wheel I long traction, the fiber and the beam pipe wheel I long traction wheel lock. Fiber there is a certain amount of tensile force in the warm water tank section, on the other hand the fiber in the round led fiber close to the inner side of the beam tube, the fiber length is less than the length of the beam tube, so the fiber length is negative I I long into the cold water tank, due to the great contraction of the beam tube in the cooling and the formation of not only compensates for the negative in front of more than long, and required for the formation is more than long.