![]() The vapor comes not from boiling water, but from liquids that contain silicon, and sometimes also controlled additives known as dopants. Rather than just allowing that steam to escape out of the teakettle, you're actually conveying it through piping to a burner where that vapor is burned." "As you raise the temperature of the water, but not so high that it boils, you still create steam, or vapor, that's above the liquid itself. "In very simple terms, imagine the teakettle on your stove," Gausman said. Michelle King and Greg Gausman, who manage Technology Delivery at the optical fiber plant in Wilmington, North Carolina, explain the Outside Vapor Deposition this way. ![]() There are various forms of the process, but the one most commonly used at Corning is Outside Vapor Deposition (OVD), which "builds" the new glass in miniscule layers on top of (or around) a solid substrate. It's also the process Corning uses to produce other specialized glass technology products, like sophisticated telescope mirrors.Īnd it represents a classic Corning combination of deep materials understanding, process control expertise, cutting-edge equipment design, and automation. ![]() Vapor deposition is key to Corning's worldwide leadership in optical fiber. It's called vapor deposition – a high-temperature process that creates glass by depositing layer after layer of tiny glass particles on a growing surface, rather than cooling a molten liquid. In addition to said control, the flow rate of H2 is changed to make the pulling velocity constant while monitoring the pulling velocity.Corning produces some of the world's purest glass through a process that, for a while, doesn't seem to involve glass at all. ![]() The luminous energy of the transmitted light is monitored, and the luminous energy of the transmitted light is taken out as a voltage signal which is used as a monitor of the relative positional relationship between the burner I for the core and the parent material IV. The burner I for the core is fixed and the pulling velocity of the parent material IV is regulated to make the distance between the burner I for the core and the position of the leading end of the porous parent material IV constant, and an He-Ne laser beam is irradiated to the position of the leading end of porous parent material IV so that the beam may sweep the leading end of the parent material. CONSTITUTION:SiCl4, GeCl4, H2, O2, and Ar are supplied from a burner I for the core, and SiCl4, H2, and Ar are supplied from burners II and III for the clad to synthesize a porous parent material IV. In the radial direction of the optical fiber preform, the absolute value of the ratio of the difference between the refractive index of the optical fiber preform at a first position where the refractive index ratio is 0.25 and the refractive index of the optical fiber preform at a second position where the refractive index ratio is 0.75, and the distance (mm) between the first position and the second position, is at least 0.0015 (/mm) when calculated in accordance with a formula 1.read more read lessĪbstract: PURPOSE:To maintain effectively the uniformity in the growth direction by controlling the pulling velocity to make the position of the growth point constant, and feeding the pulling velocity back to the gas flow rate conditions of a burner for the core in the manufacture of a porous parent material by a VAD process. In a section which extends from the core section to the cladding section in the radial direction of the optical fiber preform and in which the refractive index changes, the refractive index of the cladding section is set as a baseline of 0.0 for refractive index ratios and the maximum value of the refractive index of the core section as a refractive index ratio of 1.0. Abstract: The present invention is an optical fiber preform, comprising a core section with a relatively high refractive index and a cladding section with a relatively low refractive index.
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