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On the origin of excess loss in highly GeO2-doped single-mode MCVD fibers

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11 Author(s)
Bubnov, M.M. ; Fiber Opt. Res. Center, Moscow, Russia ; Semjonov, S.L. ; Likhachev, M.E. ; Dianov, E.M.
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Index profile grading and elimination of the central dip have yielded the lowest loss ever reported for modified chemical vapor deposition-made highly GeO2-doped single-mode fibers (1.33 dB/km at 1550 nm for Δ=2.9%). Investigation of the angular distribution of scattering has shown that much of the optical loss in such fibers is due to anomalous scattering. This scattering arises in the region of the central dip in the refractive index profile and at the core-cladding interface.

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Photonics Technology Letters, IEEE  (Volume:16 ,  Issue: 8 )