Chapter 2 Network Classification Dark fiber. It is optical fiber that has been installed (typically in the ground)but which does not have the necessary electronics installed at each end to make it usable The term dark fiber refers to fiber that has been manufactured with black pigment to improve its reflectivity. F network Management and operation www.gxmu.edu.cnNetwork Management and Operation Dark fiber: www.gxmu.edu.cn *The term dark fiber refers to fiber that has been manufactured with black pigment to improve its reflectivity.F It is optical fiber that has been installed (typically in the ground) but which does not have the necessary electronics installed at each end to make it usable. Chapter 2 Network Classification