Contraves Space Ag

Oerlikon Contraves Ag

Other

Synopta Gmbh

Fischer, Edgar

Wandernoth, Bernhard

Edgar Fischer

Bernhard Wandernoth

Reinhard Hanno Czichy

Jean-Michel Mayor

Manfred Wittig

Andreas Herren

Saverio Sanvido

Carsten Meier

Andreas Märki

Klaus Pribil

Beat Schmid

Andreas Maerki

The invention relates to a hybrid communication apparatus for high-rate data transmission between moving and/or stationary platforms, comprising at least one transmission and reception device, wherein the transmission engineering used is radio-frequency engineering. The invention provides for light waves to be used for the data transmission either as an alternative or in addition. The transmission and reception devices () comprise a radio-frequency transmitter/receiver () and a multiplicity of optical transmitters/receivers () which are arranged in annular fashion around the radio-frequency transmitter/receiver ().

Hybrid communication apparatus for high-rate data transmission between moving and/or stationary platforms

Lightwaves (), which carry data signals and beacon light, are used for establishing a connection between a receiver and a transmitter located remote from each other. An acquisition sensor () is provided for acquiring the lightwaves () in the receiver, which generates acquisition sensor signals (Sc) from the received lightwaves. The lightwaves (), which are conducted over a telescope () and a beam splitter (R), are fed to the acquisition sensor () as well as to a fiber nutator scanning device (). Besides useful signals (Sa, Sb), an additional signal (Sw, Sm', Sm) is obtained with the aid of the scanning device (), which is used for making the acquisition easier.

Method and arrangement for establishing a connection between satellites

A device is used for generating error signals for regulating the optical alignment of two lightwaves in connection with coherent heterodyne reception and comprises a receiver device ( ) arranged focused opposite a front face at the end of a lightwave fiber ( ) in order to make possible the transmission of the received information lightwave through the lightwave fiber ( ) to an optical waveguide coupler ( ), which is connected via a further lightwave fiber ( ) with a local laser ( ) and via two further lightwave fibers ( ) with respectively one detector ( ) for generating at least one error signal (Sr). A piezoelectric deflection unit ( ) acts on this front face of the lightwave fiber ( ) located in the focusing area of the receiving device.

Method and device for generating an error signal in connection with coherent heterodyne reception of lightwaves

The system for the optimization of inter-satellite links has a terminal comprising a multiplexer ( ) which is connected to the output of a transmission unit ( ) and has a subchannel input that is connected to an evaluation unit ( ). The terminal also has a demultiplexer ( ), which is connected to the input of a receiver unit ( ) and has a subchannel output that is connected to an optimization unit ( ). With the aid of an auxiliary channel established through the multiplexer and demultiplexer in addition to the transmission channel present for user-information data, it becomes possible to transmit operation-internal data pertaining to at least one continually measured parameter to the optimization unit of the opposite terminal via the evaluation unit ( ).

Process and system to optimize optical inter-satellite links

A system for operating a laser transmitting system for optical space communications, in particular in combination with the generation of amplified laser light under space conditions. The optical laser transmitting system here consists of a laser,, acting as an optical oscillator, and an optical semiconductor amplifier,which are connected with each other by a polarization-maintaining optical fiber,, or alternatively by an optical space connection. A light beam,exiting from the optical semiconductor amplifier,is converted via a special optical lens system,into a collimated light beam,with an even lateral extension and is radiated after further optical conversions.

Laser transmitting system for use in optical space communication systems

The instant invention relates to a method and an arrangement for optical information transmission via satellites by means of broadband optical modulation and reception technology. As a rule, the arrangement is realized in optical satellite terminals, which have optical units, a laser unit, control and supply as well as monitoring units. In the exemplary embodiment, these terminals are designed for a data rate of 1.5 Gbit/s and a transmission distance of more than 1,200 km, while having a weight of less than 8 kg.

Method and arrangement for optical information transmission via satellites

A device for the directional transmission and the directional reception of modulated light waves between geostationary satellites, or respectively geostationary satellites still close to earth, which have been constructed in a particularly weight-saving manner.

Device for the directional transmission and the directional reception of modulated light waves

The method and the device of the present invention are used for aligning a transmitted and a received beam in satellite connections for the purpose of establishing and maintaining a connection between satellites by optical communications means. The device includes a control unit (3), to which a coarse adjustment unit (7), a fine adjustment unit (6), and a lead correction unit (8) are parallel connected. The parameters of the received beam (4) and also the angular values of the transmitted beam (15, 16) can be corrected by means of various summing members (5, 12, 14) in such a way that precise tracking of the received beam is achieved.

Method and device for aligning an optical transmission and reception

The instant invention contains a method for establishing a channel grid for optical transmission channels, wherein an optical communication between arbitrary stations, but in particular satellite terminals, is made possible.

Channel allocation method in connection with data transmissions in the

The alignment device (10) is used for aligning an optical transmitting beam with an optical receiving beam. It comprises a rough alignment device and a fine alignment device. The rough alignment device has a first mirror (30.1), which can be rotated by approximately 360.degree. around a first axis (14), in respect to which the first mirror (30.1) is set at 45.degree. to the first axis. The rough alignment device furthermore has a second mirror (32.1), which can be rotated by approximately 180.degree. around a second axis (16), in respect to which the second mirror (32.1) is set at 45.degree.to the second axis. The second axis (16) can be rotated around the first axis (14), so that the second mirror (32.1) can be rotated within a spatial angle of approximately one hemisphere by the cumulative rotations around the axes (14, 16). The fine alignment device is constituted by a tiltable seating device (30.6 to 30.17) for at least one mirror (30.1), by means of which this mirror (30.1) is tiltably seated. The fine alignment device furthermore has an actuator device (30.18 to 30.19), by means of which the mirror (30.1) can be tilted in relation to its center normal line (15) within a spatial angle, which is considerably less than the hemisphere. At least the tiltably fastened one of the two mirrors (30.1, 32.1) is embodied with reduced mass.

Alignment device for aligning an optical transmitting beam with an

In connection with a method and a device for the control of the optical alignment of two lightwaves in the course of a coherent superimposed reception a spatial beam regulation is achieved in that the light of a local laser (5) is superimposed on the received light (1), that then the signal obtained in this manner is divided into two identical beam portions (1A, 1B) by means of a beam splitter (2) and that a respective error signal (14, 16) is generated from the two portions by means of a respective detector arrangement (3, 4), so that the two error signal portions result in a spatial error signal. The original data signal (15) is again obtained by the addition with the correct signs of the error signal portions.

Method and device for obtaining error signals for spatial beam

The instant invention relates to a method and a device and its opto-mechanical structure for the optical transmission of data over free space distances, using the principle of phase modulation of a lightwave generated by a laser and by a homodyne superimposition in a photodector of a lightwave from a second laser on the received lightwave.

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Müllheim, Switzerland

Edgar Fischer