At&t Bell Laboratories

Other

John W Shea

Carl Raymond Taylor

Ralph J Darsey

John Michael Turnipseed

Bob J Overton

Lisa M Larsen-Moss

J Thomas Chapin

Charles M Leshe

Addison G Hardee, Jr

Manuel R Santana

Krishnaswamy Kathiresan

Parry A Moss

M Fred Marx

Mary J Presnell

A hermetically sealed optical fiber cable (20) includes a core (21) comprising a plurality of optical fiber ribbons (22,22) disposed within a core tube (30) comprised of a high temperature resistant polymeric material. The core tube is disposed within a hermetic sealing member (40) which comprises a metal of low electrochemical activity having a sealed seam. An outer jacket (50) is disposed about the hermetic sealing member. The core may be filled with a waterblocking filling material (35). The material of the core tube undergoes only limited degradation because of the limited amount of oxygen and/or moisture trapped in the hermetically sealed cable. The filling material and/or other materials of the cable scavenge moisture and oxygen which travel longitudinally of the cable and reach portions of the cable subjected to a high temperature because of a leak in an adjacent steam line. The filling material and/or other materials are such that they cooperate with polymeric materials of the cable to prevent oxygen and humidity from degrading coating material of the optical fiber. Further, the filling material and the core tube are such that degradation of the core tube in the hermetically sealed cable is avoided.

Optical fiber cable which resists damage caused by a hostile environment

An optical fiber package (52) includes a length of optical fiber (22) wound in a plurality of convolutions on a bobbin (50). In order to maintain the convolutions in a precision wound package and to prevent snags during payout, it is necessary that each convolution of optical fiber be adhered to at least a portion of an adjacent convolution. This is accomplished by providing the length of optical fiber with an adhesive material (32) which is not tacky at room temperature but which becomes tacky at a predetermined temperature. After the convolutions have been wound on the bobbin, the bobbin is treated to cause the adhesive material to become tacky and cause each convolution to adhere to at least a portion of adjacent convolutions. Suitable adhesion is caused to occur with any adhesive material for which molecular bonding can occur across the interface between contiguous portions of adjacent convolutions as a result of suitable treatment. The adhesion between convolutions is sufficient to cause a precision wound package to be maintained, but is such as to allow separation of each convolution from an adjacent convolution during payout without the occurrence of breaks.

Method for providing stable package of elongated optical fiber with

Methods are provided for making an optical fiber transmission medium which includes optical fiber (21) provided with a coating system (31) typically including two layers each of a different coating material. An inner layer (32) of a first coating material is called the primary coating and an outer layer is termed the secondary. In order to achieve desired performance characteristics, performance is related to properties of a coating system. The coating materials have well defined moduli and the second coating material has an elongation which is substantially less than in prior secondary coating materials. Adhesion levels which are optimized rather than maximized are substantially stable with respect to time. Curing of the coating materials may be accomplished simultaneously or in tandem with the application separately of the coating materials.

Method of making optical fiber

System for guiding a vehicle from a rest position to a target

A buffered optical fiber (20) includes an optical fiber (21) comprising a core and a cladding. Typically, the optical fiber is enclosed by at least one layer (23) of coating material. The optical fiber is enclosed by a plastic buffer layer (30). Interposed between the optical fiber and the buffer layer is a decoupling material (40) which provides a controlled coupling of the buffer layer to the underlying coating material. As a result, there is sufficient adhesion between the buffer layer and the underlying coating material to maintain the buffer layer in place during normal use of the buffered optical fiber. On the other hand, the adhesion is low enough so that the buffer layer may be removed upon the application of resonably low stripping forces. Advantageously, the decoupling material also allows the selective removal of the optical fiber coating material as well as the plastic buffer layer.

Buffered optical fiber having a strippable buffer layer

An optical fiber transmission medium (30) ) includes optical fiber (21) provided with a coating system (31) typically including two layers each of a different coating material. An inner layer (32) of a first coating material is called the primary coating and an outer layer is termed the secondary. In order to achieve desired performance characteristics, performance is related to properties of a coating system. The coating materials have well defined moduli and the second coating material has an elongation which is substantially less than in prior secondary coating materials. Adhesion levels which are optimized rather than maximized are substantially stable with respect to time. Curing of the coating materials may be accomplished simultaneously or in tandem with the application separately of the coating materials.

Optical transmission media and methods of making same

Stable package of elongated optical fiber strand material

An electric outlet assembly includes a receptacle plate having an opening and an inner surface when secured to a flat surface; first and second U-shaped blocks positioned adjacent the opening at the inner surface for supplying AC current; a ground post positioned in line with the opening at the inner surface for providing a ground contact; and a plug for removably connecting an electric cord to the first and second U-shaped blocks and the ground post. In a first embodiment, the plug includes a flat oval plate having electrical contacts at opposite ends thereof and a connectorpost positioned centrally therein which, when inserted through the opening of the receptacle plate and rotated by 90.degree., provides electrical connection between the electrical contacts and the U-shaped blocks and between the connector post and the ground post. In a second embodiment, first and second conductive racks are slidably mounted within a housing at spaced apart locations and a non-conductive gear mounted on a ground shaft engages the racks for moving the racks into electrical contact through openings in the housing with the U-shaped blocks, with the ground shaft electrically connecting with the ground post.

Electric outlet assembly

A cosmetic mirror comprising a mirror housing having a centrally-located aperture therein, lighting means mounted within the housing laterally adjacent the aperture, a mirror assembly comprising two back-to-back mirrors pivotally mounted within the aperture, a rotatable support stand attachment secured to the housing, comprising a rotatable cylindrical support bar having a center aperture section therein, end aperture sections therein, a first set of meshing gears within the end aperture sections, spring means operatively communicating at one end thereof with the meshing gears and at the opposite end thereof with the end aperture sections of the rotatable support bar for outwardly biasing the meshing gears in the end aperture sections, and a second set of meshing sections fixed to the mirror housing at the base thereof or fixed to guide rails slidably secured within said mirror housing at the base thereof for contacting the first set of meshing gears in a meshing arrangement. A removable support stand and cover means is also provided for securing the mirror housing at a plurality of angular positions and also acting as a protective cover assembly for the mirror assembly when the cosmetic mirror is not being used. The removable support stand and cover means is prepared from a U-shaped flexible material and is of cross-sectional configuration. The free ends of the support stand and cover means have tabs thereon adapted to releaseably engage the center aperture of the support bar to secure the support stand and cover means to the bar.

Growing community of inventors

Chamblee, GA, United States of America

John W Shea