One embodiment is a fiber optic cable including at least one subunit, a tube,
a plurality of strength members, and a cable jacket. The subunit includes a fiber
optic ribbon and a sheath, wherein the sheath is tight-buffered about the fiber
optic ribbon, thereby inhibiting buckling of the ribbon during temperature variations.
The tube houses at least a portion of the at least one subunit to form a tube assembly.
The plurality of strength members are disposed radially outward of the tube and
are surrounded by the cable jacket. Other embodiments include a plurality of subunits
in a stack with each subunit having a sheath for security purposes. Additionally,
a tube assembly can have a fiber optic packing density of about 0.05 or greater.
