Patent ID: 9625667
Date: 2017-04-18
CPC Classifications: G02B

Claim:
1. An optical fiber cable comprising: a strength member substantially symmetrical along a longitudinal axis of the optical fiber cable, wherein the strength member is made of a composite material made of a polymer matrix, wherein the strength member is centrally located; a plurality of fiber units being wound around the strength member in a helical shape, wherein each of the plurality of fiber units comprises: one or more optical fibers; a first covering layer; and a second covering layer, wherein the first covering layer is enclosed by the second covering layer, wherein each of the one or more optical fibers is enclosed by the first covering layer, wherein the second covering layer is made of a thermoplastic material and the first covering layer is made of polymethyl methacrylate, wherein a coefficient of thermal expansion of the thermoplastic material is less than 2.0×10 an outer jacket surrounding each of the plurality of fiber units, wherein the outer jacket further comprises: a third outer jacket layer; a second outer jacket layer; and a first outer jacket layer, wherein the second outer jacket layer is made of thermoplastic polyurethane, the first outer jacket layer is made of aramid yarns and the third outer jacket layer is made of 85A polyether type thermoplastic polyurethane, wherein the second outer jacket layer surrounds the first outer jacket layer, the first outer jacket layer surrounds the third outer jacket layer and the third outer jacket layer surrounds the plurality of fiber units.