Abstract: The specification describes optical fiber cables designed for microduct installations. The microduct cables are coated with a sheath having particulates added to modify the drag of the outer surface of the cable to air, and thereby facilitate air blown installation. The particulates are nanoclay, silica, alumina, or other suitable solid particles of less than 5 microns. The coating comprises a prepolymer containing the filler, and is UV cured.

Abstract: A composite modular optical fiber ribbon structure has one or more separate sub-ribbons, each encased in a first matrix having a relatively high elastic modulus at room temperature. The sub-ribbons are assembled in a planar array which is encased in a second matrix having a relatively low elastic modulus at room temperature.

Abstract: A composite modular optical fiber ribbon structure has one or more separate sub-ribbons, each encased in a first matrix having a relatively high elastic modulus at room temperature. The sub-ribbons are assembled in a planar array which is encased in a second matrix having a relatively low elastic modulus at room temperature.

Abstract: An optical fiber ribbon capable of being divided into two or more robust sub-units along predetermined dividing lines has a plurality of optical fibers in a substantially flat array which have a first, low, matrix-to-fiber coating, which may be a coloring ink, adhesion for facilitating mid-array or mid-span fibers access. The two fibers on either side of each of the dividing lines and adjacent thereto and to each other, have an enhanced or high matrix-to-fiber coating adhesion whereby the sub-units created by the division are sufficiently robust to retain the fibers within the matrix.

Abstract: An optical fiber ribbon in which a plurality of optical fibers are held in an array has a matrix material for bonding to the fibers to form the ribbon. The matrix material has certain characteristics which serve to enhance fiber access, among which are an elastic modulus from 600 to 1200 MPa at room temperature, from 100 to 280 MPa at 100.degree. C., and from 15 to 45 MPa at temperatures greater than 170.degree. C. The matrix material swells in ethanol more than 15% by volume within 20 minutes, and is virtually immune to the action of cleaning solvents. The matrix material has a surface tension of 20-35 mJ/m.sup.2 as do the color coding inks which identify the fibers.