Coated optical fibers

Optical waveguides – Having particular optical characteristic modifying chemical... – Of waveguide core

Reexamination Certificate

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Details

C522S090000, C522S096000, C522S120000, C522S121000, C522S182000, C428S357000, C428S364000, C428S368000, C428S375000, C428S378000, C385S143000, C385S141000

Reexamination Certificate

active

07865055

ABSTRACT:
The invention relates to coated optical fibers comprising soft primary coatings and to such primary coatings for protecting glass optical fibers having a sufficient high resistance against cavitation. In particular, the primary coatings have a cavitation strength at which a tenth cavitation appears (σ10cav) of at least about 1.0 MPa as measured at a deformation rate of 0.20% min−1and of at least about 1.4 times their storage modulus at 23° C. The coating preferably shows strain hardening in a relative Mooney plot, preferably has a strain energy release rate Go of about 20 J/m2or more, and preferably has a low volumetric thermal expansion coefficient. The invention furthermore provides a method and apparatus for measuring the cavitation strength of a primary coating.

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Proposal of the R-1102 coating composition, which was commercially available before Nov. 22, 2000.

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