Optical waveguides – Having particular optical characteristic modifying chemical... – Of waveguide core
Reexamination Certificate
2009-06-25
2010-11-30
Peng, Charlie (Department: 2883)
Optical waveguides
Having particular optical characteristic modifying chemical...
Of waveguide core
C385S123000, C385S141000, C385S144000, C065S385000
Reexamination Certificate
active
07844162
ABSTRACT:
A thermally stable chalcogenide glass, a process for making the same, and an optical fiber drawn therefrom are provided. A chalcogenide glass having the composition Ge(5−y)As(32−x)Se(59+x)Te(4+y)(0≦y≦1 and 0≦x≦2) is substantially free from crystallization when it is heated past the glass transition temperature Tgor drawn into optical fibers. A process for making the thermally stable chalcogenide glass includes purifying the components to remove oxides and scattering centers, batching the components in a preprocessed distillation ampoule, gettering oxygen impurities from the mixture, and heating the components to form a glass melt. An optical fiber formed from the chalcogenide glass is substantially free from crystallization and exhibits low signal loss in the near-infrared region, particularly at wavelengths of about 1.55 μm.
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V. Nguyen et al, “Very Large Temperature-Induced absorptive Loss in High Te-Containing Chalcogenide Fibers,” J. Lightwave Tech., vol. 18, No. 8, Oct. 2000, pp. 1395-1401.
M.F. Churbanov, et al., “Flow of Molten Arsenic Selenide in a Cylindrical Channel,” Inorganic Material, vol. 39, No. 1, 2003, pp. 77-81.
V.K. Tikhomirov, et al., “Glass formation in the Te-enriched part of the quaternary Ge-As-Se-Te system and its implication for mid-infrared optical fibres,” Infrared Phhysics & Technology 45 (2004) pp. 115-123.
Aggarwal Ishwar D.
Nguyen Vinh Q
Sanghera Jasbinder S.
Peng Charlie
The United States of America as represented by the Secretary of
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