公开(公告)号：DE69426839T2

公开(公告)日：2001-07-26

申请号：DE69426839

申请日：1994-09-03

Applicant: IBM

Inventor： GFELLER FRITZ ,  RICHARD HEINZ ,  WEISS BEAT

IPC: H04B10/10

公开(公告)号：CA2322685A1

公开(公告)日：2000-07-20

申请号：CA2322685

申请日：1999-04-21

Applicant: IBM

Inventor： HIRT WALTER ,  GFELLER FRITZ ,  INGHAM BRIAN RICHARD

IPC: H04B10/11 ,  H04L25/02 ,  H04B10/10

Abstract: The present invention provides an apparatus and a method for improved connectivity in wireless optical networks. Therefore at least two or more receiving units are used which receive an infrared signal and convert it to a digital signal. The digital signals represent data in the form of frames whereby each frame comprises at least a data field and a header field containing a preamble. A selector determines a measure related to the signalto-noise ratio of the preamble and compares the measures in order to select the best suited signal for further processing.

公开(公告)号：BR9408606A

公开(公告)日：1999-06-29

申请号：BR9408606

申请日：1994-09-03

Applicant: IBM

Inventor： GFELLER FRITZ ,  RICHARD HEINZ ,  WEISS BEAT

IPC: H01L33/00 ,  G02B5/02 ,  G08C19/36 ,  H04B10/114 ,  H04B10/40 ,  H04B10/10

Abstract: The optical transmission module has an array of infra-red LEDs (51) arranged in a regular, and preferably symmetrical manner in the cavity formed by a dome-shaped housing (52). The housing has a diffuser for apparent source enlargement. The LEDs are either individually or commonly addressable. Pref., the LEDs of the array (11) are located on a mounting base (10) such that the main radiation axis of the diodes is approx parallel to the centre axis of the housing. Infra-red light is emitted from the array through the housing (52). There is a substrate for circuitry underneath the diodes. A transceiver for wireless data communication and for use in connection with the module is also claimed, which incorporates a receiver consisting of photodiodes.

公开(公告)号：DE2836195A1

公开(公告)日：1979-03-29

申请号：DE2836195

申请日：1978-08-18

Applicant: IBM

Inventor： WILD DANIEL ,  GFELLER FRITZ

IPC: H01Q19/06 ,  H04B7/15 ,  H04B10/11 ,  H04B10/118 ,  H04B9/00

Abstract: In a satellite communication system using optical carriers the down link radiation beam pattern is limited to illuminating only the receiver sites for power economy. The transmitting laser's beam pattern is shaped in such a way that the intensity distribution at the earth surface is adapted to the geographical distribution of the receiving stations. A suitably prepared hologram or set of stacked holograms storing different beam patterns is interposed in the radiation path. The antenna characteristic may be varied by selecting a particular hologram. This is accomplished by changing the beam angle of incidence by remote control.

公开(公告)号：DE60007487T2

公开(公告)日：2004-09-16

申请号：DE60007487

申请日：2000-06-03

Applicant: IBM

Inventor： GFELLER FRITZ ,  SCHOTT WOLFGANG

IPC: G06F11/00 ,  H04L1/00 ,  H04L1/08 ,  H04L1/20

公开(公告)号：AU2003255950A1

公开(公告)日：2004-03-03

申请号：AU2003255950

申请日：2003-08-06

Applicant: IBM

Inventor： HIRT WALTER ,  GFELLER FRITZ

IPC: G01S19/48 ,  H04L12/28 ,  H04W64/00

Abstract: The present invention is related to an apparatus and method for determining the location of a communication device within a wireless network in order to provide a geolocation functionality to the communication device participating under an access protocol of a wireless local-area network (WLAN) infrastructure such as IEEE 802.11 or Hiperlan. The apparatus comprises at least two transponder units for communicating with the communication device when the communication device is situated in a coverage area of the wireless network and a processing unit for deriving the location of the communication device within the coverage area in dependence on information received from the transponder units.

公开(公告)号：PL175130B1

公开(公告)日：1998-11-30

申请号：PL32001894

申请日：1994-09-03

Applicant: IBM

Inventor： GFELLER FRITZ ,  RICHARD HEINZ ,  WEISS BEAT

IPC: H01L33/00 ,  G02B5/02 ,  G08C19/36 ,  H04B10/114 ,  H04B10/40 ,  H04B10/10

Abstract: 1. An optical module for data transmission containing a matrix of infrared electroluminescent diodes positioned in a regular and symmetric way and a dome-shaped housing creating a recess characterised by a fact that a matrix of electroluminescent diodes (11, 31, 41, 51, 71, 81, 91, 101, 111, 121, 201, 221) is located in a recess and a dome-shaped housing (52,72, 102, 112, 122) contains an element (53, 73, 103, 113, 123) dispersing infrared radiation emitted by electroluminescent diodes (51, 71, 101, 111, 121).

公开(公告)号：IT1165437B

公开(公告)日：1987-04-22

申请号：IT2813579

申请日：1979-12-18

Applicant: IBM

Inventor： BAPST URS HEINRICH ,  GFELLER FRITZ ,  VETTIGER PETER

IPC: G01J1/42 ,  G01J1/44 ,  G02F2/00 ,  G02F2/02 ,  G06K7/10 ,  H04B10/114 ,  H04B

Abstract: An arrangement for separating disturbing ambient light from an optical data signal, comprising an interference filter (1), the passband of which matches the wavelength of the optical data signal, and further comprising two photodiodes which are so arranged that one photodiode receives the light (IS, IAT) transmitted through the interference filter, and that the other receives the reflected light (IAR). Adjusting means, e.g., in the form of a settable aperture (4) or an additional simple filter (5) are provided for adjusting the transmitted and reflected portions of the ambient light to each other. Output signal (S1, S2) of both photodiodes are subtracted from each other in compensation circuitry (6). This results in compensation of the ambient light components so that at the output a signal (SR) is available which depends only on the actual data signal (IS).

公开(公告)号：DE3069558D1

公开(公告)日：1984-12-06

申请号：DE3069558

申请日：1980-08-21

Applicant: IBM

Inventor： CHEVILLAT PIERRE ,  GFELLER FRITZ

IPC: G02B6/12 ,  B42D15/10 ,  G02B6/34 ,  G03H1/04 ,  G06K1/12 ,  G06K19/16 ,  G07D7/00 ,  G07D7/20 ,  G07F7/08 ,  G06K19/08 ,  G03H1/00

Abstract: 1. Identity card comprising information in holographic form, including a substrate (2) as basis of the card, a transparent layer (3) mounted on said substrate constituting a plane optical waveguide, and a further layer (4) mounted on said waveguide, which contains at least one hologram (5), characterized by light coupling means (6) consisting of a further hologram which corresponds to a predetermined, specific light source pattern (31) and by which only a reference light wave corresponding to said specific light source pattern can be coupled into said wave guide.

公开(公告)号：DE69425447T2

公开(公告)日：2009-09-10

申请号：DE69425447

申请日：1994-09-03

Applicant: IBM

Inventor： GFELLER FRITZ ,  RICHARD HEINZ ,  WEISS BEAT

IPC: H01L33/00 ,  G02B5/02 ,  G08C19/36 ,  H04B10/114 ,  H04B10/40

Abstract: The optical transmission module has an array of infra-red LEDs (51) arranged in a regular, and preferably symmetrical manner in the cavity formed by a dome-shaped housing (52). The housing has a diffuser for apparent source enlargement. The LEDs are either individually or commonly addressable. Pref., the LEDs of the array (11) are located on a mounting base (10) such that the main radiation axis of the diodes is approx parallel to the centre axis of the housing. Infra-red light is emitted from the array through the housing (52). There is a substrate for circuitry underneath the diodes. A transceiver for wireless data communication and for use in connection with the module is also claimed, which incorporates a receiver consisting of photodiodes.