Abstract: The invention relates to a method and a device for detecting the respiratory activity of a person and for controlling the time progression of breathing gas pressure, especially in accordance with physical parameters and considering parameters indicating the momentary physiological condition of the breathing person. According to the invention, the device for detecting the respiratory activity of a person has at least one first device that provides a first signal indicating the breathing gas flow v, wherein at least one signal processing device is provided for processing said first signal. The signal processing device is configured in such a way that said device determines a reference relation on the basis of a first signal detected during a first time interval. On the basis thereof, said device determines a correlation relation between the reference relation and the first signal.

Abstract: The transmission module is composed of a housing that hermetically tightly surrounds a cavity containing a plurality of semiconductor lasers and comprises a plurality of optical connecting waveguides secured hermetically tight in the housing, each of which optically connecting a respective laser in the cavity to a respective fiber leading away from the outside of the housing.

Abstract: Process for the production of a waveguide beam converter for shaping a laser beam collection. A plurality of waveguides are produced and arranged in such a way that at least one individual laser beam can be injected into each waveguide. The waveguides are firstly produced on a substrate using planar technology, and subsequently detached from the substrate over a part of their length, starting from their beam exit ends. The free ends are then arranged and fixed in accordance with an intended output beam arrangement of the output laser beam collection.

Abstract: The present invention relates to a process for coating high-temperature-resistant fibrous materials with metal aluminates. The disclosed process includes immersing the starting fibrous material in a sol derived from at least two compounds: a compound of cerium or lanthanum and a compound of aluminum, to deposit a coating of metal aluminate on the fibrous material. The compounds of cerium, lanthanum and aluminum are selected from nitrates, acetates, oxalates and acetylacetonates. After the immersion, the fibrous material is removed from the sol after it is wetted, dried at temperatures of less than 400 degrees C. for at least 1 hour under pressure of less than or equal to 5 mbar and the fibrous material is introduced into a desired matrix at a temperature of more than 600 degrees C.

Abstract: Reaction Bonded Ceramics for Ceramic Composite Materials Comprising Mullite as the Main Component and Corundum and Thortveitite or Cerianite as Minor ComponentsThe present invention pertains to reaction bonded mullite-containing ceramic molded parts, a process for their preparation and their use.A particular embodiment of the present invention consists in reaction bonded mullite-containing ceramic molded parts, obtainable by the heat-treatment of a finely dispersed mixture of an aluminum-containing material, a silicon-containing material, and a rare earth metal-containing material in an oxygen-containing atmosphere.

Abstract: An optical planar waveguide for conducting an optical radiation along an axis consists of a wave-conducting core that extends along the axis and a coating that extends along the axis and surrounds the core, with the coating having at least one hollow space in the solid material of the coating. The waveguide is preferably made by forming a plurality of layers and by forming recesses in one of the layers, which recesses are covered to create the hollow spaces.

Abstract: An arrangement which converts a plurality of light beams having a small beam cross-section into a light beam having a larger cross-section comprises a plurality of waveguide cores with each core having a first end face which is oblong and arranged for receiving light from each of the light rays having the smaller beam cross-section and each core has a second end face which are arranged together and extend in a different direction than the first end faces for coupling light with the beam having the large beam cross-section. Preferably, each of the cores is fashioned in the form of a bisphenoid so that the first and the second core end faces are oblong in directions extending perpendicular to one another.

Abstract: An active electrical-optical rear wall for connection of electronic devices to be brought into communication with one another, in plug-in technology, whereby optoelectronic terminal installations for respective connection of an electronic device are arranged on the rear wall, which installations are connected, by means of unguided beam connections, with optical transmission channels that connect adjacent terminal installations with one another, whereby each terminal installation respectively comprises one optoelectrical transmission and reception unit per transmission channel, which unit can be connected, by means of an optical unguided beam connection, with an optoelectrical transmission and reception unit of an electronic device that is to be connected to this terminal installation. The transmission channels form a bus whose operation is completely independent of whether electronic devices are connected to terminal installations or not.

Abstract: An arrangement for optically coupling a planar optical waveguide and an optical fiber comprises forming a planar optical waveguide on a surface of the substrate, forming a trench-like depression in the surface of the substrate leading from an end face of the planar waveguide to an edge of the substrate, forming a second holder part having a fiber secured between two planar surfaces lying in a common plane, assembling the separate holder part on a pair of planar surfaces lying on each side of the depression of said substrate so that the fiber is placed in the depression with play and the fiber will be arranged with the axis of the fiber being aligned with the axis of the planar waveguide.

Abstract: Optical fiber composed of a glass doped with at least laser-active ions of an element from the rare earths. An optical fiber of glass, preferably a HMF glass, doped with Tm.sup.3+ is operated at 1.48 .mu.m as a fiber laser or amplifier on the laser transition .sup.3 F.sub.4 -.sup.3 H.sub.4. Since this thereby involves a self-saturating transition, the terminal level is emptied in accelerated fashion for a continuous wave mode by co-doping with de-activators, preferably Ho.sup.3+, Tb.sup.3+, Eu.sup.3+ and/or Pr.sup.3+ ions. The pump light wavelength can be selected from the wavelength range from 700 through 890 nm of GaAlAs emission. The optical fiber can be used in optical amplifiers or fiber amplifiers.

Abstract: A method for manufacturing optical fibers from halide glass is provided. The method includes the steps of drawing a glass mass into a fiber in a dry gas atmosphere which contains a drying agent. In a further step of the process, an OH band which may still be present can be reduced by treating the fiber with a gaseous drying agent.

Abstract: A process for producing optical fibers of high tensile strength, wherein the fiber is pulled from a glass mass of halide glass and includes surrounding the fiber and mass with a dry gas atmosphere containing a drying agent which reacts with moisture and this dry gas atmosphere includes fluorine-containing agents, in particular NF.sub.3, as the drying agent.

Abstract: A method for manufacturing optical fibers from halide glass is provided. The method includes the steps of drawing a glass mass into a fiber in a dry gas atmosphere which contains a drying agent. In a further step of the process, an OH band which may still be present can be reduced by treating the fiber with a gaseous drying agent.

Abstract: A birefringent optical waveguide structure comprises at least one or more strip waveguides of a first material embedded in a cladding layer of a second glass with at least one additional layer being applied on the cladding layer. The strip waveguides have a refractive index which is higher than the refractive index of the second glass of the cladding layers and the additional layer applies a mechanical stress to the strip waveguides which has a component extending perpendicular to the strip waveguides. Preferably, the mechanical stress is formed by the material of the additional layers having a different thermal expansion coefficient and a different elasto-optical coefficient than the materials forming the cladding layer and the strip waveguides. The method of forming the device includes rapidly cooling the structure from an elevated temperature to room temperature to create the mechanical stresses.

Abstract: A method for the manufacture of a preform of barium containing heavy metal fluoride glass comprising a core and a jacket for drawing infrared light waveguides for optical communications technology by casting molten glass onto a predetermined body of solid glass. Hitherto, such a method was executed such that molten core glass was cast into a tube of jacket glass. In order to achieve thicker preforms, one proceeds such here that a solid row of the core glass is surrounded with molten jacket glass. The boundary surface between core and jacket of the generated preform can be improved in the method disclosed herein that the surface of the solid rod is etched before being surrounded with the jacket glass. A nearly perfect boundary surface is obtained by etching with a ZrOCl.sub.2 solution.

Abstract: A fiber taper in the form of a fiber with a conically tapering at one end and having a step-shaped refractive index profile which is particularly used for coupling a single-mode fiber to a semiconductor laser. The fiber will have a core with a high index of refraction surrounded by an intermediate core layer with an index of refraction being lower by a defined index of refraction difference than the index of refraction of the core. The intermediate core layer is surrounded by a jacket or cladding layer of a lower refractive index which is lower than the refractive index of the core layer by a defined refractive index difference. An expanding beam is established given such a taper and an adiabatic mode matching from one to the other core can be achieved along the taper.

Abstract: Preforms for drawing into glass fibers are relatively quickly produced by extruding filaments or tapes from polysiloxanes and/or heteropolysiloxanes and curing such filaments. A cylindrical wound body is produced from such cured filaments by winding such filaments onto an arbor. The wound body is converted, by heating in an oxidizing atmosphere, into an oxide body composed of SiO.sub.2 and, under certain conditions, containing doping amounts of select heteroelements present in the heteropolysiloxane. After removal of the arbor, a gas stream containing chlorine gas is flushed at a temperature of about 1000.degree. to 12,000.degree. C. through the oxide body to remove any traces of water and the dry oxide body is sintered into glass at a temperature of about 1200.degree.-1500.degree. C. The tubular preform thereby attained is collapsed and a glass fiber is drawn therefrom. This process is particularly suitable for the fabrication of gradient optical fibers.

Abstract: A method for depositing glass by decomposition of glass forming compounds in the vapor phase wherein a gaseous mixture of glass forming compounds is introduced into a refractory tube, and a source of heat is applied to the tube while the tube is being rotated. The source of heat is moved parallel to the axis of the tube to provide a moving hot zone therealong and at the same time to cause a conical neck portion to develop in the tube at which deposition of the glass forming compounds takes place.

Abstract: A narrow band laser transmitter comprising a semiconductor laser and an external optical resonator coupled by a coupling arrangement to the semiconductor laser characterized by the external optical resonator being a wavelength-selective fiber directional coupler in the form of a double core fiber whose cores have different refractive index discontinuities to the respective environments and different cross-sections. The laser transmitter is suitable for practical use, has a space-saving structure and is stable in operation.

Abstract: A method for the manufacture of glass, in particular, for glass fibers for optical communications, is provided, wherein glass particles on a substrate rod rotating about its axis, are deposited from a flame. In order to increase the yield of the deposition, two or more substrate rods are arranged at a distance from one another such that, between them an interstice with a diameter which is preferably smaller than the diameter of the free flame remains free and the flame is conducted through the interstice. By this method it is possible for the flame to be surrounded by substrate surfaces from several sides, as a consequence of which an increase in the yield of the deposition rate results.