Optical: systems and elements – Optical amplifier – Optical fiber
Reexamination Certificate
2007-07-17
2007-07-17
Hughes, Deandra M. (Department: 3663)
Optical: systems and elements
Optical amplifier
Optical fiber
C065S390000, C372S006000
Reexamination Certificate
active
11151176
ABSTRACT:
A device amplifies light at wavelengths in the vicinity of 1420-1530 nm, using thulium doped silica-based optical fiber. This wavelength band is of interest as it falls in the low-loss optical fiber telecommunications window, and is somewhat shorter in wavelength than the currently standard erbium doped silica fiber amplifier. The device thus extends the band of wavelengths which can be supported for long-distance telecommunications. The additional wavelength band allows the data transmission rate to be substantially increased via wavelength division multiplexing (WDM), with minimal modification to the standard equipment currently used for WDM systems. The host glass is directly compatible with standard silica-based telecommunications fiber. The invention also enables modified silicate based amplifiers and lasers on a variety of alternative transitions. Specifically, an S-band thulium doped fiber amplifier (TDFA) using a true silicate fiber host is described.
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Cole et al, Novel heavy metal modified silica glass fibers doped with thulium, holimium, and thulium-sensitive-holmium high quantum efficiencies, Filed on Oct. 2, 2000, Patent Pending.
Cole Brian
Dennis Michael
Hughes Deandra M.
Karasek John J.
Ressing Amy
United States of America as represented by the Secretary of the
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