Patents Assigned to Compagnie Generale d'Electricite
  • Dual-mode cavity filter
    Patent number: 5793271
    Abstract: Comprising one or more resonant cavities in which are produced two resonant modes at two different frequencies f.sub.1 and f.sub.2, both modes having essentially the same field distributions but rotated 90.degree. with respect to each other. Each cavity comprises a tuning element (TS.sub.a) for tuning the resonant frequency f.sub.1 of the first mode along a first axis, a tuning element (TS.sub.b) for tuning the resonant frequency f.sub.2 of the second mode along a second axis perpendicular to the first, input coupling means (IC) and output coupling means (OC) for injecting into and extracting from the cavity, respectively, a radiofrequency signal along axes not parallel to those of resonance. Filter tuning is done by using only two tuning elements, which means that the filter cost is lower and the tuning time is reduced.
    Type: Grant
    Filed: December 18, 1996
    Date of Patent: August 11, 1998
    Assignee: Alcatel Alsthom Compagnie Generale d'Electricite
    Inventor: Jose Luis Caceres Armendariz
  • Optical receiver with an equalizing circuit for PMD-induced interference, and system with such an optical receiver
    Patent number: 5793511
    Abstract: An optical receiver is presented, which can receive and evaluate an optical signal (S) containing interference caused by polarization mode dispersion (PMD). The optical receiver has a splitting facility (1.1) which splits the routable optical signal (S) into two electrical signal components (S.sub.-, S.sub.+). The electrical signal components (S.sub.-, S.sub.+) are processed in an equalizing circuit (1.2). A control facility (1.3) controls the splitting facility (1.1) with the aid of a quality signal (Q) produced by the equalizing circuit (1.2).
    Type: Grant
    Filed: March 27, 1997
    Date of Patent: August 11, 1998
    Assignee: Alcatel Alsthom Compagnie Generale d'Electricite
    Inventor: Henning Bulow
  • Two part spacer for a high-frequency coaxial cable
    Patent number: 5790003
    Abstract: A spacer is indicated for a high-frequency coaxial cable with an inner conductor, a tube-shaped outer conductor and a dielectric cavity located between the two conductors which, through the use of different materials, has a higher thermal load capacity in the inner conductor area than in the outer conductor area. When installed, the parts, which are composed of different materials and are superimposed in the radial direction, are mechanically interconnected.
    Type: Grant
    Filed: January 22, 1997
    Date of Patent: August 4, 1998
    Assignee: Alcatel Alsthom Compagnie Generale d'Electricite
    Inventors: Horst Fischer, Hartmut Gohdes
  • Two part spacer for a high-frequency coaxial cable having a protrusion on one of the parts
    Patent number: 5790002
    Abstract: A spacer is indicated for a high-frequency coaxial cable with an inner conductor, a tube-shaped outer conductor and a dielectric cavity located between the two conductors, which has a higher thermal load-carrying capacity in the inner conductor area than in the outer conductor area, due to the use of different materials. The parts of the spacer which are made of different materials are radially superimposed and are solidly interlocked with each other by means of injection molding.
    Type: Grant
    Filed: January 24, 1997
    Date of Patent: August 4, 1998
    Assignee: Alcatel Alsthom Compagnie Generale d'Electricite
    Inventors: Horst Fischer, Hartmut Gohdes
  • Frequency-encoded optical CDMA transmission system and optical receiver therefor
    Patent number: 5784506
    Abstract: An optical frequency-encoded CDMA transmission system is presented in which received optical signals are decoded in the electric part of an optical receiver (12). To that end, the optical receiver (12) has a single photodetector (6) which converts received light into an electric signal, and which is directly or indirectly connected to a decoding unit (9, 10; 13, 14, 15), for recovering the information contained in the characteristic frequency-encoded spectrum.
    Type: Grant
    Filed: February 13, 1997
    Date of Patent: July 21, 1998
    Assignee: Alcatel Alsthom Compagnie Generale d'Electricite
    Inventor: Thomas Pfeiffer
  • Method of centrifuging a halide glass and forming an optical fiber preform
    Patent number: 5779756
    Abstract: A method of fabricating a fluoride glass optical fiber preform which has a fluoride glass core surrounded by a fluoride glass optical cladding includes the following steps: introducing the cladding glass in the molten state into a bottom part of a mold having a cylindrical inside cross-section, introducing the core glass in the molten state into a top part of the mold above the cladding glass, and inwardly solidifying the core glass and the cladding glass from the interface between the glasses and the mold. The kinetics of solidification of the core glass are such that complete solidification of the cladding glass occurs before complete solidification of the core glass.
    Type: Grant
    Filed: June 19, 1997
    Date of Patent: July 14, 1998
    Assignee: Alcatel Alsthom Compagnie Generale d'Electricite
    Inventors: Frederic Chiquet, Marylise Le Crom, Jean-Jacques Girard
  • Apparatus for shaping binary optical signals, and use thereof to modify said signals
    Patent number: 5781326
    Abstract: To shape binary optical signals, the apparatus comprises a first stage for providing a modulating signal whose high levels are stabilized so as to depend little on fluctuations in the input signal. The signal is applied to a second stage including an interferometer structure designed to deliver an output signal that is the result of interference between first and second auxiliary waves, the interference being respectively constructive and destructive when the power of the modulating signal corresponds respectively to a first logic state and to a second logic state. The apparatus can be used to modify the input signal by deleting or inserting data. It can be used in optical data switching or transmission.
    Type: Grant
    Filed: June 13, 1997
    Date of Patent: July 14, 1998
    Assignee: Alcatel Alsthom Compagnie Generale D'Electricite
    Inventors: Dominique Chiaroni, Michel Sotom, Dominique De Bouard
  • Method for preparing laser faces
    Patent number: 5780120
    Abstract: A method of preparing faces of a laser based on III-IV compounds, the method comprising the following operations:1) the faces of the laser are opened;2) said faces of the laser are placed in an enclosure in which there obtains a pressure of about 10.sup.-7 mbar to about 10.sup.-8 mbar, and they are subjected to a step of cleaning by irradiation with a pulsed laser; and3) the same pulsed laser is used to ablate a target so as to subject said faces to a passivation operation whereby silicon Si or gallium nitride GaN is deposited thereon by the pulsed laser deposition method until a thickness is obtained lying in the range 2 .ANG. to 20 .ANG..
    Type: Grant
    Filed: December 18, 1996
    Date of Patent: July 14, 1998
    Assignee: Alcatel Alsthom Compagnie Generale d'Electricite
    Inventors: Christian Belouet, Dominique Boccon-Gibod, Sylvaine Kerboeuf
  • Corrector, apparatus, and a method for controlling the electromagnetic torque of an asynchronous machine
    Patent number: 5777452
    Abstract: Apparatus and method for controlling the electromagnetic torque of an asynchronous machine. The apparatus includes a corrector which controls the electromagnetic torque of an asynchronous machine by regulating the magnetic flux and by controlling the electromagnetic torque C.sub.m, the corrector including a regulator circuit (3) for regulating the rotor magnetic flux .phi..sub.r , having non-linear control using input/output linearization by static looping and whose output controls the d-component of the stator current i.sub.s, a first linear corrector (1) of the proportional, integral type whose output v is the input to the regulator circuit, and a second linear corrector (2) of the proportional, integral type whose output controls the angular frequency of the rotor currents .omega..sub.s1.
    Type: Grant
    Filed: November 5, 1996
    Date of Patent: July 7, 1998
    Assignee: Alcatel Alsthom Compagnie Generale D'Electricite
    Inventor: Jean-Luc Thomas
  • Method for management of multicast connections and switching node termination realizing said method
    Patent number: 5774464
    Abstract: The method is used in a switching network over which data packets are transferred and which includes a plurality of switching nodes with switching node terminations (SNT) and associates in each one of the switching node terminations (SNT) internal header information (IHI) included in an internal data packet received by the switching node termination and identifying an internal connection within the switching node and ending in the switching node termination, to external header information (EHI) included in an external data packet and identifying an outgoing external connection external to the switching node and originating from the switching node termination. The internal header information (IHI) includes a connection reference number (CRN) and a transfer type is associated to the internal connection. The method comprises three steps:a. determining the transfer type;b.
    Type: Grant
    Filed: November 7, 1996
    Date of Patent: June 30, 1998
    Assignee: Alcatel Alsthom Compagnie Generale d'Electricite
    Inventors: Ludwig Alice Julienne Pauwels, Pascal Albert Emile Lefebvre
  • Method of and system for writing a bragg grating point by point by point in an optical fiber
    Patent number: 5768454
    Abstract: A system for writing a Bragg grating point-by-point in an optical waveguide includes an illumination system for producing a primary beam. It further includes a diffraction grating to receive the primary beam and to produce a zero order secondary beam and two symmetrical secondary beams of higher order and a focusing optical device for focusing the secondary beams onto a writing area of the waveguide. The diffraction grating and the focusing optical device define an intensity function of writing in the area of the guide including a central peak and two secondary peaks spaced from the central peak by a distance equal to the pitch of the grating.
    Type: Grant
    Filed: December 24, 1996
    Date of Patent: June 16, 1998
    Assignee: Alcatel Alsthom Compagnie Generale d'Electricite
    Inventors: Jose Chesnoy, Pierre Sansonetti, Isabelle Riant
  • Control circuit for an electronic switch, and a switch constituting an application thereof
    Patent number: 5764088
    Abstract: The control path of the switch (I) comprises an input stage (T2, T1) having an input (H) coupled to the input (E) for the control signal and having its output coupled to the control electrode (G) of the switch (I). A protection circuit (D1, Z2) coupled between the load (C) and the control path includes a threshold effect component (Z2) and a decoupling element (D1). On being made conductive by the current that results from a surge generated in a circuit of the load (C), the protection circuit (D1, Z2) is coupled to the input (H) of said input stage (T2, T1) to act on said switch (I) in the same way as a control signal for the switch (I). In this manner, the control path prevents current in the load (C) from dropping off suddenly.
    Type: Grant
    Filed: October 10, 1997
    Date of Patent: June 9, 1998
    Assignee: Alcatel Alsthom Compagnie Generale D'Electricite
    Inventors: Jean-Paul Lavieville, Didier Muller
  • Wavelength demultiplexer
    Patent number: 5751872
    Abstract: The demultiplexer comprises a diffraction space defined by a reception surface coupled to a grating. In order to obtain output waves of flattened spectral response, the input waveguide and the reception surface are dimensioned so that the input wave diffracts over said surface and presents a plurality of secondary lobes. The demultiplexer is particularly applicable to optical communications systems with wavelength multiplexing.
    Type: Grant
    Filed: December 24, 1996
    Date of Patent: May 12, 1998
    Assignee: Alcatel Alsthom Compagnie Generale d'Electricite
    Inventors: Hans Bissessur, Roland Mestric, Christian Duchet
  • Method of fabricating a surface emitting semiconductor laser
    Patent number: 5747366
    Abstract: In a method of fabricating a surface emitting semiconductor layer, to achieve good electrical confinement and good flatness of the mirrors delimiting the resonant cavity of the laser, an electrical confinement layer is made by growing a localized aluminum alloy layer on the active layer, except for an opening area on top of which the mirror is to be formed. After epitaxial regrowth, the alloy layer is oxidized laterally. Applications include the fabrication of semiconductor lasers on III-V substrates such as InP and GaAs.
    Type: Grant
    Filed: December 26, 1996
    Date of Patent: May 5, 1998
    Assignee: Alcatel Alsthom Compagnie Generale D'Electricite
    Inventors: Fran.cedilla.ois Brillouet, Leon Goldstein, Joel Jacquet, Antonina Plais, Paul Salet
  • Molecular organic compound with ferromagnetic properties and a method of producing it
    Patent number: 5714622
    Abstract: The invention is drawn to organic compounds of the general formulae L--A--Z or L--A'--L' as defined in the specification. The compounds are readily crystallizable and can be used for their ferromagnetic properties.
    Type: Grant
    Filed: April 12, 1996
    Date of Patent: February 3, 1998
    Assignee: Alcatel Alsthom Compagnie Generale D'Electricite
    Inventors: Stanislas Galaj, Alain Le Mehaute
  • Method of manufacturing a sheathed twisted superconductor having a high critical temperature
    Patent number: 5706571
    Abstract: A sheathed twisted superconductor with a high critical temperature is made from a billet obtained by assembling square cross-section single strands in a square cross-section metal tube. The multistrand obtained by drawing the billet through a roller die is twisted with a particular lay and rolled using rollers the diameter of which is much greater than the twist lay. The sheathed twisted superconductor obtained by this method is intended for variable current applications.
    Type: Grant
    Filed: September 13, 1996
    Date of Patent: January 13, 1998
    Assignee: Alcatel Alsthom Compagnie Generale D'Electricite
    Inventors: Gerard Duperray, Erick Beghin, Denis Legat, Peter Friedrich Herrmann
  • Method of managing concurrent accesses to a memory by a plurality of users using atomic instructions to prevent read/write errors
    Patent number: 5666546
    Abstract: A method of managing concurrent accesses by a plurality of users to a memory, for reading or writing data in memory zones of the memory on the basis of an index whose value identifies a memory zone in the memory, includes the steps of: recording the value of the index in a first memory register; summing the contents of the first memory register with an increment value; recording the result of the summing operation in a second memory register; atomically interchanging the index value with the contents of the second memory register; and taking the content of the first memory register as the current value of the index if the contents of the second memory register is identical to the old value of the index, otherwise performing each of the preceding steps again.
    Type: Grant
    Filed: June 15, 1994
    Date of Patent: September 9, 1997
    Assignee: Alcatel Alsthom Compagnie Generale d'Electricite
    Inventor: Gary Donnan
  • Method of manufacturing a supercapacitor electrode
    Patent number: 5658355
    Abstract: A method of manufacturing a supercapacitor electrode containing a metal oxide and carbon-containing material, the method including the following steps: starting from a salt of said metal dissolved in an aqueous solution of a strong base, the hydroxide of the metal is precipitated in the form of a gel by adding an alcohol; the precipitate of the hydroxide of the metal is washed and dried; active carbon is added to the precipitated hydroxide of the metal to consitute a first mixture; the first mixture is subject to heat treatment in order to transform the hydroxide into an oxide, and a mixture of metal oxide and of active carbon is obtained which constitutes the active material of the electrode; and a binder is added to the active material to form a paste which is put into the form of an electrode.
    Type: Grant
    Filed: May 26, 1995
    Date of Patent: August 19, 1997
    Assignee: Alcatel Alsthom Compagnie Generale d'Electricite
    Inventors: Denis Cottevieille, Xavier Andrieu, Frederic Cariou
  • Ferromagnetic crystalline compounds of copolymers of naphthylamine derivatives and aminoaromatic compounds
    Patent number: 5637675
    Abstract: Crystalline compounds with ferromagnetic properties are described which are inclusion compounds comprising metal salts in copolymers in which the repeating unit includes one unit from a first group of aminoaromatic derivatives of 1-naphthylamine and corresponding oxidized forms, connected to one unit from a second group of substituted aminoaromatic compounds selected from substituted amines containing at least two condensed benzene nuclei, substituted polycyclic compounds containing at least one aniline moiety in their structure, and aniline derivatives carrying a substituent connected to the nucleus by an ethynylene or para-phenylene unit, and corresponding oxidized compounds. Methods for the preparation of these compounds are also described.
    Type: Grant
    Filed: May 2, 1995
    Date of Patent: June 10, 1997
    Assignee: Alcatel Alsthom Compagnie Generale d'Electricite
    Inventors: Alain Le Mehaute, Stanislas Galaj, Denis Cottevieille, Fran.cedilla.ois Tsobnang, Fran.cedilla.ois Lefort
  • Magnetic copolymer, a method of manufacture and applications thereof
    Patent number: 5635582
    Abstract: The present invention concerns a magnetic copolymer having a structural unit comprising a first multivalent radical and a second multivalent radical derived from an aminoaromatic compound selected from a substituted amine containing at least two condensed benzene nuclei, a substituted polycyclic compound containing at least one aniline unit in its structure, and an aniline derivative substituted on the ring by an ethynylidene or paraphenylene side chain, these compounds being in their reduced or oxidized forms, said first and said second radical being coupled together by a carbon-nitrogen bond and the nitrogen atoms being separated by a single aromatic ring, characterized in that said first radical is derived from a compound selected from 1-naphthylamine, which may be substituted, in its reduced or oxidized form.
    Type: Grant
    Filed: September 27, 1994
    Date of Patent: June 3, 1997
    Assignee: Alcatel Alsthom Compagnie Generale D'Electricite
    Inventors: Stanislas Galaj, Alain Le Mehaute