Patents Assigned to TECHNISCHE UNIVERSITÄT BERLIN
  • Publication number: 20100080068
    Abstract: The invention relates, among other things, to a memory cell for storing at least one piece of bit data. Said memory cell comprises at least two electrical terminals and a semiconductor structure with a band curve (EL) that has at least one potential well. The charged state of the potential well with charge carries can be increased by applying a supply voltage (Us=Uspeis) to the two terminals, can be reduced by applying a discharge voltage (Us=Usperr), and can be maintained by applying a maintaining voltage (Us=Ubei), the respective charged state of the potential well defining the piece of bit data of the memory cell. According to the invention, the semiconductor structure has a space charge region (Wn) while the potential well is formed by a semiconductor heterostructure.
    Type: Application
    Filed: December 3, 2007
    Publication date: April 1, 2010
    Applicant: TECHNISCHE UNIVERSITÄT BERLIN
    Inventors: Dieter Bimberg, Martin Geller, Andreas Marent
  • Publication number: 20100074293
    Abstract: In a method for the production of a single photon source with a given operational performance, the given operational performance for the individual photon source may be fixed by a directed setting of the fine structure gap of the excitonic energy level for at least one quantum dot. The at least one quantum dot is produced with a quantum dot size corresponding to the fine structure gap for setting.
    Type: Application
    Filed: November 20, 2006
    Publication date: March 25, 2010
    Applicant: TECHNISCHE UNIVERSITÄT BERLIN
    Inventors: Anatol Lochmann, Robert Seguin, Dieter Bimberg, Sven Rodt, Vladimir Gaysler
  • Publication number: 20100061214
    Abstract: The invention relates to a method and a device for producing a hologram in an optical medium, particularly for storing data in the optical medium. In the method, the hologram is produced in the optical medium using laser beams, wherein the laser beams are formed from a laser beam emitted by a free-running semiconductor laser, are directed onto the optical medium, optionally contradirectionally, and at least partially spatially overlap in the optical medium. For producing holograms using inexpensive components with a high contrast, the invention provides for arranging the reflection unit (15) such that the optical path length (?x) between the focus of the laser beam in the storage medium (10) and the reflecting surface of the reflection unit (15) satisfies the condition ?x=0.5*?s*a in the region of the optical axis, wherein a is a natural number greater than or equal to 1 and ?s is a distance between neighboring coherence centers of the laser beam produced by the semiconductor laser (16).
    Type: Application
    Filed: January 20, 2008
    Publication date: March 11, 2010
    Applicant: TECHNISCHE UNIVERSITAET BERLIN
    Inventors: Susanna Orlic, Enrico Dietz, Christian Mueller
  • Publication number: 20100025453
    Abstract: A method for generating a wire bond between a wire and an electrical contact member is provided. The method comprising the steps of: pressing a first surface of a portion of the wire against a second surface of the electrical contact member with a first force while vibrating the portion of the wire along the second surface in order to generate a bond; measuring the time dependent vibration amplitude of the portion of the wire at a number of discrete time steps during the generation of the bond; measuring the time dependent deformation of said portion of the wire due to said applied first force and said vibration at a number of discrete time steps during the generation of the bond; and generating a time dependent first signal from at least said vibration amplitude and said deformation at a number of discrete time steps during the generation of the bond that is a direct measure of the stability of the bond at the respective time step.
    Type: Application
    Filed: September 4, 2007
    Publication date: February 4, 2010
    Applicants: TECHNISCHE UNIVERSITAET BERLIN, FRAUNHOFER-GESELLSCHAFT ZUR FOEDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
    Inventors: Ute Geissler, Herbert Reichl, Holger Gaul, Klaus-Dieter Lang, Martin Schneider-Ramelow
  • Publication number: 20090326940
    Abstract: An information device for voice-operated support of a user includes a storage medium, a knowledge database, a processing unit, an input device, a recording component, a transcription component, and an ontological analysis component. A signal is detected by the input device and stored by the recording component via the processing unit in the storage medium. The signal is transformed into a corresponding text by the transcription component via the processing unit and stored in the storage medium. The ontological analysis component categorizes the text via the processing unit using the knowledge database and processes the text using the categorization and the knowledge database via the processing unit.
    Type: Application
    Filed: June 26, 2009
    Publication date: December 31, 2009
    Applicants: Deutsche Telekom AG, Technische Universitaet Berlin
    Inventors: Guntbert Markefka, Klaus-Dieter Liedtke, Vincente-Manuel Lopez-Monjo, Florian Metze
  • Publication number: 20090244289
    Abstract: A method and an apparatus for estimating a quality of an audio-video signal includes calculating audio and video quality factors from audio and video technical characteristics. An audio-video quality factors interaction is computed from an interaction between the audio and video quality factors. At least one of an audio quality, a video quality and an audio-visual quality is computed using the audio and video quality factors and the audio-video quality factors interaction.
    Type: Application
    Filed: March 30, 2009
    Publication date: October 1, 2009
    Applicants: Deutsche Telekom AG, Technische Universitaet Berlin
    Inventors: Alexander Raake, Marie-Neige Garcia, Sebastian Moeller
  • Patent number: 7580595
    Abstract: An optoelectronic data transmission device has an active section with an active element that generates an optical gain if a forward bias is applied, and an absorption section. A waveguide incorporates the active section and the absorption section. Mirrors providing feedback for light are placed to frame the waveguide. The device can be operated in a pulsed regime emitting pulsed laser light. An additional modulator allows modulating its refractive index due to the electrooptic effect. A device providing for the modulation of the refractive index of the modulator. The refractive index of the additional modulator can be varied such that the repetition frequency of the output pulsed laser light is varied. The waveguide further incorporates the additional modulator.
    Type: Grant
    Filed: May 9, 2008
    Date of Patent: August 25, 2009
    Assignee: Technische Universitaet Berlin
    Inventors: Dieter Bimberg, Nikolai N. Ledentsov, Vitaly Shchukin
  • Publication number: 20090187983
    Abstract: A method for controlling Internet access of a mobile device by using a communication system having a number of access points includes the steps of performing a certificate-based authentication between an authentication access point and a mobile device seeking access to the Internet; transmitting a certificate from the mobile device to the authentication access point; verifying the certificate by the authentication access point; determining whether the authenticating mobile device's certificate has been revoked prior to the expiration of its lifetime; and granting the authenticating mobile device access to the Internet, if the certificate has been verified successfully and not revoked prior to the expiration of its lifetime.
    Type: Application
    Filed: September 5, 2008
    Publication date: July 23, 2009
    Applicants: Board of Trustees of the University of Illinois, Technische Universitaet Berlin
    Inventors: Petros Zerfos, Jatinder Pal Singh, Marcin Solarski, Pablo Vidales, Nathanael Thompson, Haiyun Luo
  • Patent number: 7522285
    Abstract: The aim of the invention is to provide a method for determining the frequency response of an electrooptical component, particularly, for example, of a light-generating or light-modulating component, which is easy to carry out. To this end, the invention provides a method during which optical pulses with a pulse frequency (fp) are generated. The electrooptical component (60) is controlled by an electrical measuring signal (Smess) with a measuring frequency (fmess) in such a manner that an optical output signal (Saus) is formed that is modulated with the measuring frequency (fmess). The measuring frequency (fmess) is equal to an integral multiple of the pulse frequency (fp) plus a predetermined frequency offset ($g(D)f). The pulses and the output signal (Saus) are mixed, and a mixed product (M) is detected whose modulation frequency corresponds to the predetermined frequency offset ($g(D)f).
    Type: Grant
    Filed: September 23, 2004
    Date of Patent: April 21, 2009
    Assignee: Technische Universitaet Berlin
    Inventors: Dieter Huhse, Olaf Reimann
  • Publication number: 20090099843
    Abstract: A method for determining a speech quality measure of an output speech signal with respect to an input speech signal, wherein the input signal passes through a signal path of a data transmission system resulting in the output signal, includes the steps of pre-processing the output signal; determining at least one of an interruption rate of the pre-processed output signal and a measure for an intensity of musical tones present in the pre-processed output signal; and determining the speech quality measure from at least one of the interruption rate and the measure for the intensity of the musical tones.
    Type: Application
    Filed: September 11, 2008
    Publication date: April 16, 2009
    Applicants: DEUTSCHE TELEKOM AG, FRANCE TELECOM, TECHNISCHE UNIVERSITAET BERLIN
    Inventors: Vincent Barriac, Nicolas Cote, Valerie Gautier-Turbin, Sebastian Moeller, Alexander Raake, Marcel Waeltermann, Ulrich Heute, Kirstin Scholz
  • Patent number: 7429808
    Abstract: The invention relates to a three-phase linear synchronous motor with an armature having an axial bore through the middle, into which the optical element—for example an optical lens—can be installed. The armature comprises a sliding sleeve inside which an axially polarized permanent magnet with an unobstructed center bore is located. The armature is guided inside a stationary outer sheath. The armature is displaced by interaction between the permanent magnet and a magnetic field that is moved along the optical axis. The traveling field is generated by at three adjacent stator coils wound around the outer sheath and each having a separate and variable supply of current. The position of the armature is defined by self-holding forces of the permanent magnet in the magnetic field of the coils. The traveling wave magnetic field and hence the armature can be axially displaced with as much precision as desired. The track of the armature can be made as long as desired by changing the number of coils.
    Type: Grant
    Filed: March 23, 2004
    Date of Patent: September 30, 2008
    Assignee: Technische Universitaet Berlin
    Inventors: Heinz Lehr, Stephan Schrader, Steffen Walter
  • Publication number: 20080233302
    Abstract: The invention relates to a method and device for production of a three-dimensional article from a material, by means of layered application. According to the invention, a dropwise application is carried out, whereby drops of reaction components are ejected by a nozzle arrangement (3) and applied to a base reaction component (2), arranged on a substrate (1). The material for the three-dimensional article is formed in layers, with reaction of the base reaction component (2) with reaction components on contact, whereby the material is formed on a reaction of the base reaction component with one of the reaction components to give a material with one material property and on another reaction of the base reaction component with another of the reaction components to give a material with another material property. On production of the three-dimensional article, an article section is produced in which a gradual transition between the one material property and the other material property is generated.
    Type: Application
    Filed: May 24, 2005
    Publication date: September 25, 2008
    Applicants: TECHNISCHE UNIVERSITÄT BERLIN, VOXELJET TECHNOLOGY GMBH, INSTITUT FÜR POLYMERFORSCHUNG DRESDEN E.V.
    Inventors: Philip Elsner, Stefan Dreher, Ingo Ederer, Brigitte Voit, Janke Gudrun, Michael Stephan
  • Publication number: 20080232803
    Abstract: A hybrid optical network comprising a single channel optical ring network with a plurality of ring nodes and a star subnetwork. The star subnetwork comprises a central wavelength router, a plurality of combiners being connected to input ports of the central wavelength router, and a subset of the ring nodes of the ring network, each node of the subset including a tunable transmitter and a tunable receiver to communicate optical data packets over the star subnetwork. Optical data packets routed between two ring nodes of the subset over the star subnetwork are assigned a specific wavelength that determines the routing of the data packets through the central wavelength router. The invention further regards a method of routing data packets between a source ring node and a destination ring node of a hybrid optical network.
    Type: Application
    Filed: January 26, 2005
    Publication date: September 25, 2008
    Applicant: Technische Universität Berlin
    Inventor: Martin Maier
  • Publication number: 20080025216
    Abstract: A method and a system is provided for optimizing the throughput of a TCP flow from a TCP source to a TCP destination in a wireless network with the path of the flow encompassing a wireless link between a wireless transmitter and a wireless receiver. The throughput is optimized by using link-layer mechanisms at the wireless transmitter which are adaptive to the instantaneous TCP dynamics of the TCP flow. In particular, a cross-layer approach is disclosed which serves to tunnel information of TCP congestion control dynamics directly from the TCP based transport layer to the data link-layer which selects in response to these information modulation and/or coding schemas to transmit TCP segments via data link-layer blocks with improved TCP throughput.
    Type: Application
    Filed: July 28, 2006
    Publication date: January 31, 2008
    Applicants: Technische Universitaet Berlin, Deutsche Telekom AG
    Inventors: Jatinder Pal Singh, Gerhard Kadel, Gerd Zimmermann, Bangnan Xu
  • Publication number: 20070282439
    Abstract: The invention relates to a method for producing a composite material, to a composite material produced according to said method and to the use of said material.
    Type: Application
    Filed: November 5, 2004
    Publication date: December 6, 2007
    Applicant: Technische Universität Berlin
    Inventors: Rolf-Dieter Zehbe, Helmut Schubert
  • Patent number: 6942731
    Abstract: The invention relates to a method for improving the efficiency of epitaxially grown quantum dot semiconductor components having at least one quantum dot layer. The efficiency of semiconductor components containing an active medium consisting of quantum dots is often significantly below the theoretically possible values. The inventive method enables the efficiency of the relevant component to be clearly increased without substantially changing the growth parameters of the various epitaxial layers. In order to improve the efficiency of the component, the crystal is morphologically changed when the growth of the component is interrupted at the point in the overall process at which the quantum dots of a layer have just been covered. The growth front is smoothed at the same time, leading to, for example, a reduction in waveguide loss as the thickness of the waveguide is more homogeneous if the relevant component has one such waveguide.
    Type: Grant
    Filed: August 30, 2001
    Date of Patent: September 13, 2005
    Assignee: Technische Universitaet Berlin
    Inventors: Roman Sellin, Nikolai N. Ledenstov, Dieter Bimberg
  • Patent number: 6893950
    Abstract: A process for the production of contacts for electrically operated II/VI semiconductor structures (for example laser diodes). The contact materials palladium and gold hitherto used in relation to electrically operated II/VI semiconductor lasers are distinguished by a relatively great, not purely ohmic specific contact resistance in relation to the II/VI cover layer. The consequentially necessary higher operating voltages result in the unnecessary generation of heat and thus substantially accelerate degradation of the entire laser structure. That effect causes a limitation in terms of the service life of II/VI semiconductor laser diodes. The invention permits the operation of semiconductor laser diodes with lower operating voltages. The II/VI semiconductor laser diodes produced with our invention are distinguished by a longer service life. That permits inter alia commercial use of semiconductor laser diodes in the blue-green spectral range.
    Type: Grant
    Filed: November 24, 2003
    Date of Patent: May 17, 2005
    Assignee: Technische Universitaet Berlin
    Inventors: Matthias Strassburg, Oliver Schulz, Udo W. Pohl, Dieter Bimberg
  • Publication number: 20040219697
    Abstract: A process for the production of contacts for electrically operated II/VI semiconductor structures (for example laser diodes). The contact materials palladium and gold hitherto used in relation to electrically operated II/VI semiconductor lasers are distinguished by a relatively great, not purely ohmic specific contact resistance in relation to the II/VI cover layer. The consequentially necessary higher operating voltages result in the unnecessary generation of heat and thus substantially accelerate degradation of the entire laser structure. That effect causes a limitation in terms of the service life of II/VI semiconductor laser diodes. The invention permits the operation of semiconductor laser diodes with lower operating voltages. The II/VI semiconductor laser diodes produced with our invention are distinguished by a longer service life. That permits inter alia commercial use of semiconductor laser diodes in the blue-green spectral range.
    Type: Application
    Filed: November 24, 2003
    Publication date: November 4, 2004
    Applicant: Technische Universitaet Berlin
    Inventors: Matthias Strassburg, Oliver Schulz, Udo W. Pohl, Dieter Bimberg
  • Patent number: 6673641
    Abstract: A process for the production of contacts for electrically operated II/VI semiconductor structures (for example laser diodes). The contact materials palladium and gold hitherto used in relation to electrically operated II/VI semiconductor lasers are distinguished by a relatively great, not purely ohmic specific contact resistance in relation to the II/VI cover layer. The consequentially necessary higher operating voltages result in the unnecessary generation of heat and thus substantially accelerate degradation of the entire laser structure. That effect causes a limitation in terms of the service life of II/VI semiconductor laser diodes. The invention permits the operation of semiconductor laser diodes with lower operating voltages. The II/VI semiconductor laser diodes produced with our invention are distinguished by a longer service life. That permits inter alia commercial use of semiconductor laser diodes in the blue-green spectral range.
    Type: Grant
    Filed: April 24, 2002
    Date of Patent: January 6, 2004
    Assignee: Technische Universitaet Berlin
    Inventors: Matthias Strassburg, Oliver Schulz, Udo W. Pohl, Dieter Bimberg
  • Publication number: 20020031219
    Abstract: A transmitter, a receiver and a combined transceiver arrangement (50) exchange data with external devices through a serial transmission channel. According to this invention, the transmitter (52) comprises encoding means (60, 64, 68, 70), and the receiver (54) comprises decoding means (60, 74, 76, 80). The invention is explained in detail using a design example of a crypt UART component (50).
    Type: Application
    Filed: July 17, 2001
    Publication date: March 14, 2002
    Applicant: Technische Universitaet Berlin
    Inventors: Jan Gutsche, Irenaeus Schoppa