Optical fiber with reduced attenuation loss
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United States of America Patent
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Jan 8, 2008
Grant Date -
Apr 6, 2006
app pub date -
Apr 24, 2002
filing date -
Apr 24, 2002
priority date (Note) -
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Abstract
An optical fiber having an internal glass portion, a first coating layer surrounding the glass portion and a second coating layer surrounding the first coating layer. The first coating layer is formed from a cured polymeric material obtained by curing a radiation curable composition having a radiation curable oligomer having a backbone derived from polypropylene glycol and a dimer acid based polyester polyol. The cured polymeric material has: (a) a hardening temperature (Th) from -10.degree. C. to about -20.degree. C. and a modulus measured at the Th lower than 5.0 MPa; or (b) a hardening temperature (Th) from -20.degree. C. to about -30.degree. C. and a modulus measured at the Th lower than 20.0 MPa; or (c) a hardening temperature (Th) lower than about -30.degree. C. and a modulus measured at the Th lower than 70.0 MPa.
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