Optical waveguides – Optical fiber waveguide with cladding
Reexamination Certificate
2005-03-08
2005-03-08
Font, Frank G. (Department: 2883)
Optical waveguides
Optical fiber waveguide with cladding
C385S141000
Reexamination Certificate
active
06865327
ABSTRACT:
Applicants have discovered the existence of loss peaks in optical fiber transmission systems using wavelengths in the E-band and the L-band. Specifically, they have discovered the existence of narrow loss peaks at 1440 nm, 1583 nm and 1614 nm. Because the peaks are relatively narrow, they cannot be easily removed by conventional gain equalizers in long haul transmission systems, and although the peaks are relatively small, they can nonetheless cause transmission channels to drop out in amplified DWDM transmission systems. Applicants have further discovered that these loss peaks are due to carbon contamination of the transmission fiber. Thus optical fibers should be fabricated essentially free of carbon contamination. This means eliminating carbon-containing reagents in preform and tube-making processes.
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Atkins Robert M.
Bromage Jake
Chang Kai H.
Knudsen Stig Nissen
Kristensen Poul
Fitel USA Corp.
Font Frank G.
Kianni K. Cyrus
Lowentein Sandler PC
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