Optical fiber with low loss and nanoscale structurally homogeneous core
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United States of America Patent
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Mar 20, 2018
Grant Date -
Jan 26, 2017
app pub date -
Mar 31, 2016
filing date -
Jul 24, 2015
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Abstract
An optical fiber has a core region that is doped with one or more viscosity-reducing dopants in respective amounts that are configured, such that, in a Raman spectrum with a frequency shift of approximately 600 cm−1, the fiber has a nanoscale structure having an integrated D2 line defect intensity of less than 0.025. Alternatively, the core region is doped with one or more viscosity-reducing dopants in respective amounts that are configured such that the fiber has a residual axial compressive stress with a stress magnitude of more than 20 MPa and a stress radial extent between 2 and 7 times the core radius.
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