REDUCED DIAMETER MULTIMODE OPTICAL FIBER CABLES

摘要

Described are new cable designs for indoor installations wherein the cable comprises a dual-layer optical fiber buffer encasement of acrylate resin. The buffer encasement has an acrylate compliant inner layer that protects the fiber and minimizes stress transfer to the fiber; and a hard, tough acrylate outer layer that provides crush resistance. The dual-layer optical fiber buffer encasement is wrapped with reinforcing yarn and encased in an outer protective jacket. The protective jacket is relatively thick and rigid, having a thickness of 0.7-3.0 mm, and a modulus greater than 240 MPa.

主权项

1. An optical fiber cable comprising:
(a) at least one optical fiber buffer encasement, the encasement comprising:
i. at least two 50 micron multimode optical fibers encased in a polymer matrix, the polymer matrix comprising a UV cured acrylate having a modulus in the range 0.5 to 10 MPa,ii. a UV cured acrylate polymer encasement, with a modulus in the range 200 MPa to 1000 MPa encasing the polymer matrix, the acrylate polymer encasement and the polymer matrix having a round cross section, (b) a yarn wrap strength layer surrounding optical fiber buffer encasements, (c) a cable jacket surrounding the yarn wrap strength layer, the first cable jacket consisting essentially of polymer material having:
i. a round cross section,ii. a thickness of 0.7-3.0 mm,iii. a modulus greater than 240 MPa, (d) sufficient flame retardant to meet one or more industry fire protection standards.