Abstract: A method of manufacturing a cylindrical glass optical waveguide preform having a low water content centerline region, for use in the manufacture of optical waveguide fiber, is disclosed. The centerline region of the glass optical waveguide preform has a water content sufficiently low such that an optical waveguide fiber producible from the glass optical waveguide preform of the present invention exhibits an optical attenuation of less than about 0.35 dB/km, and preferably less than about 0.31 dB/km, at a measured wavelength of 1380 nm. Method of manufacture of a porous core mandrel used in the manufacture of such a glass optical waveguide preform is also disclosed.

Abstract: Method and tool for fracturing the cement interface between a crown and a tooth or the like. The method is accomplished by positioning a piezoelectric driven rapid impacting tool against one side of a portion of a crown covering the tooth. The tool is covered with a malleable metal and is interfacing abutment with said crown. The opposite side of the crown is abutted against an anvil which is covered with a thicker malleable metal interface.

Abstract: The present invention provides for a personal message system comprised of a plurality of interfaces configured to interface with a plurality of subscribers communication devices using a plurality of formats. A group services module is provided configured to maintain communications among groups of the subscribers. A platform conversion module is also provided and is coupled to the plurality of interfaces and the group services modules configured to connect each of the plurality of subscribers within a group, regardless of the communication protocols used by the subscribers.

Abstract: Method and tool for fracturing the cement interface between a crown and a tooth or the like. The method is accomplished by positioning a piezoelectric driven rapid impacting tool against one side of a portion of a crown covering the tooth. The tool is covered with a malleable metal and is interfacing abutment with said crown. The opposite side of the crown is abutted against an anvil which is covered with a thicker malleable metal interface.

Abstract: Method and tool for fracturing the cement interface between a crown and a tooth or the like. The method is accomplished by positioning a piezoelectric driven rapid impacting tool against one side of a portion of a crown covering the tooth. The tool is covered with a maleable metal and is interfacing abutment with said crown. The opposite side of the crown is abutted against an anvil which is covered with a thicker maleable metal interface.

Abstract: A retroreflective optical communication system in which a laser at a control station is aimed at a retroreflector at a second position or station whose reflectivity can be varied so as to impress a signal onto the retroreflected beam, and then back to the first station for detection. The communication link is such that the laser and aiming capability are at the receiving or control station and, greatly reducing the aiming and power requirements and cost at the retroreflector end of the link. The retromodulator optical communication system provides a high data rate, secure, non-jammable line-of-sight communication link between the second station, which may be a remotely piloted vehicle (RPV) and its control station. The retromodulator maybe entirely passive and thus would not give its presence away as would RF transmitting and receiving stations.

Abstract: This application disclosed light polarizing apparatus in which light traverses a light path more than once. The light path passes through an amplification region caused by a population inversion. An optical element is mounted to intersect the light path at Brewster's angle polarizing the light passing therethrough.

Abstract: A cable connector assembly capable of mating to an armored optical cable and providing a hermetically sealed electronics cavity is described. A connector assembly provides a means for placing electronics in an electronics cavity. The electronics are capable of converting electrical signals to optical signals or optical signals to electrical signals within the electronics cavity in the connector assembly so that optical to optical matching of optical fibers is unnecessary. The connector contains a means for anchoring the armoring wire of the armored optical cable and at least two-spaced apart means for sealing the electronics cavity from leakage of pressure around the optical fiber cable. Furthermore, the connector assembly contains a means for passing the optical fiber core through a breakable link before termination in the electronics cavity.

Abstract: This application discloses light amplification apparatus in which population inversion is created in which energized particles collide with a lasing medium to create a population inversion. In the preferred embodiment the energized particles are atoms, ions, or molecules different than the lasing medium which are excited to a long-lived state above the ground state. Various materials usable in such light amplification apparatus are disclosed as well as means for passing light through an amplification region.

Abstract: A hermetically sealed optical fiber tube and process of fabrication. The hermetically sealed tube is fabricated from rolled wires into shaped sectors such that when the sections are joined a cylindrical tube is formed having a sufficient inside diameter to accept one or a plurality of buffered optical fibers.

Abstract: A fiber optic energy sensor and optical demodulation system is disclosed wherein the signal energy to be sensed or detected causes an etched single mode fiber to be stretched or compressed which causes the optical path length for electro-magnetic radiation traveling in the core of the optic fiber to change. The change in optic path length modulates the electro-magnetic radiation traveling in the fiber. There is also disclosed novel methods of manufacturing the novel type of fiber optic energy sensor and optical demodulation system.

Abstract: An optical communication system for drill hole logging comprises an armored cable containing one or more glass clad optical fibers inside a tubular moisture barrier, a neodymium laser in the cable reel radiates infrared light into one of the fibers, a modulator in the downhole cable-head connector shell modulates light and returns it to the surface, and a semiconductor detector in the reel demodulates the data signal from the returning light.

Abstract: An armored cable containing a hermetically sealed tube incorporating an optical fiber is described. The armored optical cable exhibits minimal inelastic elongation in response to tension at elevated temperatures and is capable of withstanding harsh ambient conditions.

Abstract: A hermetically sealed optical fiber tube and process of fabrication. The hermetically sealed tube is fabricated from rolled wires into shaped sectors such that when the sections are joined a cylindrical tube is formed having a sufficient inside diameter to accept one or a plurality of buffered optical fibers.

Abstract: A fiber optic energy sensor and optical demodulation system is disclosed wherein the signal energy to be sensed or detected causes an etched single mode fiber to be stretched or compressed which causes the optical path length for electro-magnetic radiation traveling in the core of the optic fiber to change. The change in optic path length modulates the electro-magnetic radiation traveling in the fiber. There is also disclosed novel methods of manufacturing the novel type of fiber optic energy sensor and optical demodulation system.

Abstract: A fiber optic energy sensor and optical demodulation system is disclosed wherein the signal energy to be sensed or detected causes an etched single mode fiber to be stretched or compressed which causes the optical path length for electromagnetic radiation traveling in the core of the optic fiber to change. The change in optic path length modulates the electromagnetic radiation traveling in the fiber. There is also disclosed novel methods of manufacturing the novel type of fiber optic energy sensor and optical demodulation system.

Abstract: Radiant energy is caused to modulate in phase and frequency in a single mode optical fiber by means of a relatively movable, spatially periodic perturbation.

Abstract: This application discloses light amplifier apparatus and uses for the same. A light amplifier apparatus is disclosed in which population inversion is created by optical pumping. Another light amplifier apparatus is disclosed in which population inversion is produced by collisions with other particles. Uses for light amplifiers are taught including heating of material which includes evaporation of the same, distance measuring, communication systems, television, and certain industrial applications. This application also teaches the use of optical elements at Brewster's angle for the purpose of polarization and reducing losses in passing a light beam along a path.

Abstract: Optically pumped laser amplifiers are disclosed. One type of such amplifier utilizes an excitable medium, the atoms, ions or molecules of said medium having well defined energy states including a lowest state, a lower state above said lowest state, and a higher state above said lower state, and a bright pumping light source composed of a radiative substance different from such medium which radiative substance emits energy in a spectral range which can be absorbed by such medium, and wherein the major portion of the energy absorbed by such medium causes transitions of the atoms, ions, or molecules thereof to populate the higher state.