Low-loss silica optical waveguides
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United States of America Patent
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Sep 13, 1988
Grant Date -
N/A
app pub date -
Feb 12, 1986
filing date -
Feb 12, 1986
priority date (Note) -
Expired
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Abstract
Certain dopant materials, when present in a significant power-carrying portion of a silica-based optical waveguide fiber, are effective as intrinsic loss-reducing agents; the concentration of such dopant materials is at significantly lower levels as compared with levels used for producing a refractive index difference. Suitable in this respect are germania and phosphorus pentoxide as added to essentially pure silica or to silica containing other dopant additives such as, e.g., alumina or fluorine as may be used in a waveguiding core-cladding structure. Intrinsic loss in the vicinity of 0.2 dB/km is readily realized.
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