Furukawa Electric North America, Inc.

Fitel USA Corporation

Heraeus Tenevo Gmbh

Ofs Fitel, LLC

Donald Jablonowski

Fengqing Wu

Jinkee Kim

David Kalish

Robert Lingle, Jr

Hartwig Schaper

Norbert Treber

Thomas E McDonald

Oliver Humbach

Uwe Haken

An improved optical fiber design has been found to exhibit a relatively low attenuation at the wavelength of 1385 nm (the 'water peak'), allowing for Raman amplification to be efficient and effective at wavelengths in the S-band range of 1460 to 1530 nm. An ultra-dry process is used to mate an inner core rod (core plus surrounding trench) with a cladding tube (ring region plus cladding layers) and provide a water peak loss on the order of 0.325 dB/km. The low water peak is combined with appropriate dispersion values and zero dispersion wavelength to form a fiber that supports transmission and Raman amplification in the S-, C- and L-bands of interest for optical transmission systems.

Optical fiber for improved performance in S-, C- and L-bands

On the basis of a known process for the production of a preform for an optical fiber for optical data transmission technology, the productivity of the process for the production of complex refractive index profiles is to be improved by providing a quartz glass substrate tube which exhibits different doping in radial direction, introducing a core glass made of synthetic quartz glass into the substrate tube and covering the substrate tube with a jacket tube. A substrate tube suitable therefor is also being provided which tube requires less core glass material for the production of the preform, whether during the internal deposition or for the core glass rod in the rod-in-tube technique. Regarding the process it is proposed according to the invention that a substrate tube be used which was obtained by vitrification of a porous tube-shaped SiOblank, the substrate tube being provided with a core glass layer which is produced in that to the first radial portion of the SiOblank there is added before the vitrification a first dopant which increases the refractive index of quartz glass. The substrate tube according to the invention has in the radial direction regions of different doping whereby it incorporates a core glass layer which has a refractive index of at least 1.459.

Method of making a jacketed preform for optical fibers using OVD

The specification describes a VAD method for dynamically controlling the growth rate of both the core soot and the cladding soot in response to separate growth monitors.

VAD manufacture of optical fiber preforms with improved deposition control

Dynamically controlling the reaction temperature at the tip of a soot preform by controlling the flow of hydrogen gas to the core torch provides a wide latitude of control over the temperature range necessary to produce uniform composition of the preform.

Manufacture of optical fiber preforms using modified VAD

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Dunwoody, GA, United States of America

Donald Jablonowski