公开(公告)号：DE69920671D1

公开(公告)日：2004-11-04

申请号：DE69920671

申请日：1999-04-21

Applicant: IBM

Inventor： GFELLER FRITZ ,  HIRT WALTER ,  INGHAM R

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 signal-to-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：AT257299T

公开(公告)日：2004-01-15

申请号：AT00111782

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：CZ292638B6

公开(公告)日：2003-11-12

申请号：CZ28497

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：SG32472A1

公开(公告)日：1996-08-13

申请号：SG1995001212

申请日：1995-08-25

Applicant: IBM

Inventor： GFELLER FRITZ ,  RICHARD HEINZ ,  WEISS BEAT

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

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：CA2197916A1

公开(公告)日：1996-03-14

申请号：CA2197916

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 ,  G06F3/00

Abstract: Disclosed are optical transmitter and transceiver modules for data communication. Such a transceiver module comprises an array of light emitting diodes mounted on a mounting base (140) being arranged in a regular and symmetrical manner in a dome-shaped housing (142). This housing (142) comprises diffusor means for source enlargement. In addition to the transmitter part consisting of said diodes, the transceiver module comprises a receiver. The receiver has four photodiodes (143) arranged below the mounting base (140). These photodiodes are tilted and face in different directions to receive light from all around the module. The photodiodes are protected by a thin wire mesh (145) which serves as Faraday cage to reduce electro magnetic interference. A substrate (144) for electronic circuitry in SMD-Technology is situated underneath the photodiodes (143).

公开(公告)号：CA1124798A

公开(公告)日：1982-06-01

申请号：CA339220

申请日：1979-11-06

Applicant: IBM

Inventor： BAPST URS H ,  GFELLER FRITZ ,  VETTIGER PETER

IPC: G01J1/42 ,  G01J1/44 ,  G02F2/00 ,  G02F2/02 ,  G06K7/10 ,  H04B10/114 ,  H04B9/00

Abstract: ARRANGEMENT FOR SEPARATING AN OPTICAL SIGNAL FROM AMBIENT LIGHT An arrangement for separating ambient light from an optical data signal, comprising an interference filter having a passband which matches the wavelength of the optical data signal, and two photo diodes which are so arranged that one photo diode receives the light transmitted through the interference filter, and the other receives the light reflected from the filter. A variable aperture or an additional simple filter (5) is provided to adjust the transmitted and reflected portions of the ambient light to one another. Output signals of the photo diodes are subtracted from each other in a compensation circuit. This results in compensation of the ambient light components so that an output signal from the compensation circuit only depends on the actual data signal. SZ9-78-003

公开(公告)号：CA1097108A

公开(公告)日：1981-03-10

申请号：CA305808

申请日：1978-06-20

Applicant: IBM

Inventor： WILD DANIEL ,  GFELLER FRITZ

IPC: H01Q19/06 ,  H04B7/15 ,  H04B10/11 ,  H04B10/118 ,  H04B9/00 ,  G02B5/32 ,  G02B27/38

Abstract: HOLOGRAPHIC OPTICAL SATELLITE COMMUNICATION SYSTEM In a satellite communication system using optical carriers the down link radiation beam pattern should illuminate only the receiver sites for power economy. Therefore 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. For varying the antenna characteristic a particular hologram is selected by changing the beam angle of incidence by remote control. SZ9-77-001

公开(公告)号：DE69920671T2

公开(公告)日：2005-11-17

申请号：DE69920671

申请日：1999-04-21

Applicant: IBM

Inventor： GFELLER FRITZ ,  HIRT WALTER ,  INGHAM R

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 signal-to-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：DE60007487D1

公开(公告)日：2004-02-05

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：CA2197916C

公开(公告)日：2002-12-10

申请号：CA2197916

申请日：1994-09-03

Applicant: IBM

Inventor： RICHARD HEINZ ,  GFELLER FRITZ ,  WEISS BEAT

IPC: H01L33/00 ,  G02B5/02 ,  G08C19/36 ,  H04B10/114 ,  H04B10/40 ,  H04B10/10 ,  G06F3/00

Abstract: Disclosed are optical transmitter and transceiver modules for data communication. Such a transceiver module comprises an array of light emitting diodes mounted on a mounting base being arranged in a regular and symmetrical manner in a dome-shaped housing. This housing comprises diffusor means for source enlargement, In addition to the transmitter part consisting of said diodes, the transceiver module comprises a receiver. The receiver has four photodiodes arranged below the mounting base. These photodiodes are tilted and face in different directions to receive light from all around the module. The photodiodes are protected b y a thin wire mesh which serves as Faraday cage to reduce electro magnetic interference. A substrate for electronic circuitry in SMD-Technology is situated underneath the photodiodes.