OPTICAL FIBER WITH REDUCED ATTENUATION LOSS

摘要

Optical fiber comprising an internal glass portion, a first coating layer disposed to surround said glass portion and a second coating layer disposed to surround said first coating layer, wherein said first coating layer is formed from a cured polymeric material obtained by curing a radiation curable composition comprising a radiation curable oligomer comprising a backbone derived from polypropylene glycol and a dimer acid based polyester polyol, said cured polymeric material having: (a) a hardening temperature (Th) of from -10 ~C to about -20~ and a modulus measured at said Th lower than 5.0 MPa; or (b) a hardening temperature (Th) of from20 ~C to about -30~ and a modulus measured at said Th lower than 20.0 MPa; or (c) a hardening temperature (Th) lower than about -30 ~C and a modulus measured at said Th lower than 70.0 MPa.