Abstract
At present silicate glasses used in low-loss optical waveguides fabricated by the oxidation of chlorides have typically relied upon dopants of germanium or phosphorous to raise the refractive index. Germanium has provided the primary dopant suitable for both single-mode and multimode fiber. However, the long term availability and cost of the material are in question. Furthermore, GeO2 doping is frequently accompanied by two refractive-index profile disturbances, a deposit layer structure occurring due to unfavorable equilibria between GeCI4 and Ge02, and a high-temperature burn-off of GeO.1 These disturbances may limit the ultimate bandwidths achievable.2 Beyond this, the lack of dopants to choose from also restricts fiber design for zero chromatic dispersion wavelengths.
© 1982 Optical Society of America
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