We have developed flame-retardant halogen-free fiber optic cords with a shrink-free jacket, using simplex(Φ2.8mm)cords. We have devised a new method to ensure that the jacket is shrink-free. The new method of cord manufacture has been optimized so as to minimize residual stress produced by extrusion. Subsequent shrinkage of the jacket may be nearly eliminated by this method. As a result, post-annealing becomes unnecessary when assembling connectors with the cord. Thanks to this shrink-free jacket, optical attenuation increase of the Simplex cord at low temperatures has been significantly reduced. We have also made sure that the Simplex cord displays excellent mechanical and flame-retardant properties.
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