Loose tube construction, tubes jelly filled, elements (tubes and filler rods) and water blocking yarns laid up around non-metallic central strength member, polyester yarns used to bind the cable core, water blocking tape and mica tape, dry core, then LSZH outer sheath with two red strips. Fiber. Draka Single-Mode Fiber (SMF) provides optimum performance in both the 1310 nm and 1550 nm wavelength operation ranges (including the 1565 – 1625 nm L-band), with a low dispersion in the 1310 nm window. It can be used in all cable constructions, including loose tube, tight buffered, ribbon, and. This document describes the Renka specifications for Single Mode Optical Fiber Cables, Dielectric and Armored. Matched clad fibers feature a dual UV curable acrylate. Fiber optic cables can be broadly categorized into two types: single-mode and multi-mode. They are used to connect final user to FTTH or GPON line.