Abstract: An optical cable includes an uncolored, non-opaque outer sheath housing a number n of optical fibers having respective uncolored, non-opaque coatings. At least n-1 optical fibers have uncolored, non-opaque coatings bearing respective ultraviolet identification markings. When the optical cable is normally illuminated by natural light or artificial light, the visual impact of the cable at naked eye is minimum. When, a field operator has to identify the optical fibers within the cable, she/he illuminates the optical fibers of the cable with the UV light of a UV source. This way, the UV identification markings of the optical fibers become visible to the human eye and allow the field operator to identify the optical fiber(s) of interest. Hence, identifiability of each single optical fiber is advantageously achieved without increasing the visual impact of the cable.

Abstract: Disclosed is an optical cable that includes an outer sheath housing a number of optical fibers, wherein the outer sheath has an outer cross-section in the shape of a hexagon. The outer sheath then exhibits six flat surfaces longitudinally extending along the whole cable length. Any one of such flat surfaces may be covered with a thin layer of glue and then be attached to the wall surface. As this surface is flat, a reliable and durable fixing of the cable may be achieved using an amount of glue which is far reduced in comparison to the amounts of glue typically required for fixing known cables having a round cross-section.