Bend resistant multimode optical fibers are disclosed herein. Multimode optical fibers disclosed herein comprise a core region and a cladding region surrounding and directly adjacent to the core region, the cladding region comprising a depressed-index annular portion comprising a depressed relative refractive index.

Bend resistant multimode optical fiber

A rod-in-tube method for producing a glass preform for use in the fabrication of an optical fiber, which comprises steps of inserting a glass rod (13) as a core material in a glass tube (12) as a cladding material, fusing and closing one end of the cladding material, filling a gap between the core and cladding materials with an atmosphere containing at least one gaseous halogen-containing compound and then heating the core and cladding materials at a temperature not lower than 1,900°C to collapse the gap between them and to fuse them together, from which glass preform, an optical fiber with low attenuation of light transmission is fabricated.

Method for producing glass preform for optical fiber

A foam polymer jacketed rigid strength member for a fiber optic cable is disclosed, as is the method for its production. The foam jacket is made by feeding into an extruder a base polymer material, preferably a resin, such as polypropyene. The base material is melted in the extruder and a blowing agent is admixed. As the mixture exits the extruder, the polymer is expanded into a cellular foam. The polymer is foamed onto a rigid strength member by means of a crosshead. The resulting jacketed rigid strength member demonstrates improved resistance to thermal contraction, reducing the contribution of stresses in the fiber optic cable components.

Coated central strength member for fiber optic cables with reduced shrinkage

An integrated deposition system is described that is capable of vaporizing low vapor pressure liquid precursors and conveying the vapor to a processing region to fabricate advanced integrated circuits. The integrated deposition system includes a heated exhaust system, a remote plasma generator, a processing chamber, a liquid delivery system, and a computer control module that together create a commercially viable and production worthy system for depositing high capacity dielectric materials from low vapor pressure precursors.

Apparatus for the deposition of high dielectric constant films

A breakout cable includes a polymer jacket and a plurality of micromodules enclosed within the jacket. Each micromodule has a plurality of bend resistant optical fibers and a polymer sheath comprising PVC surrounding the bend resistant optical fibers. Each of the plurality of bend resistant optical fibers is a multimode optical fiber including a glass cladding region surrounding and directly adjacent to a glass core region. The core region is a graded-index glass core region, where the refractive index of the core region has a profile having a parabolic or substantially curved shape. The cladding includes a first annular portion having a lesser refractive index relative to a second annular portion of the cladding. The first annular portion is interior to the second annular portion. The cladding is surrounded by a low modulus primary coating and a high modulus secondary coating.

Micromodule cables and breakout cables therefor

of the Disclosure Optical communication media particularly adapted for blow-in installation, including single optical fibers and lightweight flexible optical cables comprising one or more glass optical fibers in a multilayer polymer coating, are disclosed. The multilayer coating includes a textured polymer outer layer and at least one soft buffer layer positioned between the textured polymer outer layer and the glass optical fiber or fibers, the buffer layer comprising a low Tg polymer and preferably having a layer thickness at least sufficient to maintain thermally induced microbending loss in the optical communication medium below about 0.5 db/km at medium operating temperatures in the range of 0 °C to -60 °C.

Coated optical fibers and cables and method

A fiber optic coupler is formed by providing a glass tube having a longitudinal aperture extending therethrough. Glass optical fibers, each having a core, cladding and coating are disposed within the longitudinal aperture, the fibers extending beyond each end thereof. The coating is removed from that portion of the fibers in the midregion of the tube. The midregion of the tube is heated, collapsed about the fibers, and drawn to reduce the diameter thereof over a predetermined length. The fibers that are used in the process of making the coupler are initially provided with a coating that is too thin to provide good handleability and strength. However, the thin initial coating enables the use of a tube having a small aperture and thereby enhances the tube collapse step. After the coupler is formed, the fibers extending therefrom are overcoated. The process can be used to make other kinds of optical devices including integrated optical components.

Method of making optical devices

A precision burner for oxidizing halide-free, silicon-containing compounds, such as, octamethyl-cyclotetrasiloxane (OMCTS), is provided. The burner includes a subassembly (13) which can be precisely mounted on a burner mounting block (107) through the use of an alignment stub (158), a raised face (162) on the burner mounting block (107), and a recess (160) in the back of the subassembly (13). The burner's face includes four concentric gas-emitting regions: a first central region (36, 90) from which exits a mixture of OMCTS and O 2 , a second innershield region (38, 92) from which exits N 2 , a third outershield region (40, 42, 94, 96) from which exits O 2 , and a fourth premix region (44, 98) from which exits a mixture of CH 4 and O 2 . The burner provides more efficient utilization of halide-free, silicon-containing raw materials than prior burners.

Method of using precision burners for oxidizing halide-free, silicon-containing compounds

Disclosed is a method and apparatus for providing reactant vapors to a utilization site. The apparatus includes a vaporization chamber enclosed by top and bottom walls, side walls and first and second end walls. The first end wall is elevated with respect to the second end wall. The reactant is supplied in liquid form to a flow distributor that delivers the liquid to that portion of the bottom wall near the first end wall. The angle with which the bottom wall is inclined with respect to horizontal is sufficient to cause the liquid to flow down the bottom wall at a rate sufficient to form a film, the thickness of which is smaller than that thickness which would support a bubble during heating of the film. The surface is heated to a temperature greater than the boiling point of the liquid, thereby converting the liquid reactant to a vapor that is delivered to the vapor utilization site.

Method and apparatus for vaporization of liquid reactants

Disclosed are refractive index profiles for total dispersion compensating optical waveguide fibers for use in high data rate, long length telecommunications systems. The optical waveguide fibers in accord with the invention provide substantially equal compensation of total dispersion over a range of wavelengths, thus facilitating wavelength division multiplexed systems. Also disclosed are spans of optical waveguide fiber that include a length of transmission fiber together with a length of the compensating fiber. The spans are joined end to end in series arrangement to form the optical waveguide fiber part of a telecommunication system.

Michael B. Cain

Papers

Coated optical fibers and cables and method

Method of making optical devices

Method of using precision burners for oxidizing halide-free, silicon-containing compounds

Method and apparatus for vaporization of liquid reactants

Dispersion slope compensating optical fiber