公开(公告)号：JP2002185406A

公开(公告)日：2002-06-28

申请号：JP2001309303

申请日：2001-10-05

Applicant: LUCENT TECHNOLOGIES INC

Inventor： AHRENS ROBERT G ,  PRESBY HERMAN MELVIN ,  TYSON JOHN A

IPC: G02B23/02 ,  G02B17/08 ,  G02B23/12 ,  H04B10/112 ,  H04B10/118 ,  H04B10/10 ,  H04B10/105 ,  H04B10/22

Abstract: PROBLEM TO BE SOLVED: To provide a free-space optical communications system capable of changing the reception of a signal amplitude on a reception optical fiber of a receiving telescope by dithering the optical beam transmitted by a transmitting telescope or the reception optical fiber to execute the reception of the maximum transmission signal amplitude on the reception optical fiber at a reception focal surface when a contraction of the reception signal amplitude is measured. SOLUTION: In one embodiment, the transmission optical fiber is dithered in a pattern, and the beam to be transmitted in the corresponding pattern is vibrated. The reception signal amplitude of an image on the focal surface of the receiving telescope is vibrated in the same pattern in response to it. A phase of the reception signal is compared with that of transmitted moving beam. Thus, an origin of the dithering pattern of the transmitting beam can be moved until the maximum amplitude of the transmitted beam is incident to the reception optical fiber.

公开(公告)号：JP2001298422A

公开(公告)日：2001-10-26

申请号：JP2001051337

申请日：2001-02-27

Applicant: LUCENT TECHNOLOGIES INC

Inventor： AHRENS ROBERT G ,  PRESBY HERMAN MELVIN ,  TOURGEE GEORGE E ,  TYSON JOHN A

IPC: G02B26/08 ,  G02B6/04 ,  H04B10/10 ,  H04B10/118 ,  H04B10/22 ,  H04B10/105

Abstract: PROBLEM TO BE SOLVED: To provide a method and a system in an optical wireless communication system, by which a transmission unit and a reception unit are arranged and the alignment of the units is maintained. SOLUTION: The reception unit 160 is provided with an optical bundle 200, that is placed at a focus of an objective optical element. The optical bundle 200 consists of an array of optical fibers arranged around a reception fiber. Moreover, the reception unit 160 is also provided with many detectors 180, that measure the intensity of optical signals on corresponding fibers in the optical bundle 200.

公开(公告)号：CA2357918C

公开(公告)日：2005-08-09

申请号：CA2357918

申请日：2001-09-28

Applicant: LUCENT TECHNOLOGIES INC

Inventor： PRESBY HERMAN MELVIN ,  TYSON JOHN ANTHONY ,  AHRENS ROBERT G

IPC: G02B23/02 ,  G02B17/08 ,  G02B23/12 ,  H04B10/112 ,  H04B10/118 ,  H04B10/10 ,  H04B10/04 ,  H04B10/06

Abstract: A free space optical communication system is disclosed whereby the signal amplitude incident upon a receive optical fiber of a receive telescop e is varied by dithering either the light beam transmitted by a transmit telescop e or the receive optical fiber when a decrease in received signal amplitude is measured so as to effect the incidence of the maximum transmitted signal amplitude upon the receive optical fiber at the receive focal plane. In one embodiment, the transmit optical fiber is dithered in a pattern, causing the transmitted beam to oscillate in a corresponding pattern. In response, the received signal amplitude of the image on the focal plane of the receive telescope also oscillates in the same pattern. By comparing the phase of the received signal with the phase of the movement of the transmitted beam, the origin of the transmitted beam dithering pattern can be moved until the maximum amplitude of the transmitted beam is incident upon the receive optical fiber. In another embodiment, the receive optical fiber is dithered in a variable pattern to locate the point of maximum received signal amplitude. Using the aforementioned phase comparison technique, the receive optical fiber is moved progressively closer to the point of maximum amplitude of the received signal on the receive focal plane. In cases where atmospheric disturbances alter the path of the transmitted beam, the transmitted beam and the receive optical fiber may both be dithered to achieve coincidence between the point of maximum signal amplitude and the receive optical fiber.

公开(公告)号：DE60100824D1

公开(公告)日：2003-10-30

申请号：DE60100824

申请日：2001-04-17

Applicant: LUCENT TECHNOLOGIES INC

Inventor： AHRENS ROBERT G ,  PRESBY HERMAN MELVIN ,  TYSON JOHN A

IPC: G02B23/02 ,  G02B17/08 ,  G02B23/12 ,  H04B10/112 ,  H04B10/118 ,  H04B10/10

公开(公告)号：DE60100824T2

公开(公告)日：2004-07-01

申请号：DE60100824

申请日：2001-04-17

Applicant: LUCENT TECHNOLOGIES INC

Inventor： AHRENS ROBERT G ,  PRESBY HERMAN MELVIN ,  TYSON JOHN A

IPC: G02B23/02 ,  G02B17/08 ,  G02B23/12 ,  H04B10/112 ,  H04B10/118 ,  H04B10/10

公开(公告)号：CA2357918A1

公开(公告)日：2002-04-05

申请号：CA2357918

申请日：2001-09-28

Applicant: LUCENT TECHNOLOGIES INC

Inventor： TYSON JOHN ANTHONY ,  PRESBY HERMAN MELVIN ,  AHRENS ROBERT G

IPC: G02B23/02 ,  G02B17/08 ,  G02B23/12 ,  H04B10/112 ,  H04B10/118 ,  H04B10/10 ,  H04B10/04 ,  H04B10/06

Abstract: A free space optical communication system is disclosed whereby the signal amplitude incident upon a receive optical fiber of a receive telescop e is varied by dithering either the light beam transmitted by a transmit telescop e or the receive optical fiber when a decrease in received signal amplitude is measured so as to effect the incidence of the maximum transmitted signal amplitude upon the receive optical fiber at the receive focal plane. In one embodiment, the transmit optical fiber is dithered in a pattern, causing the transmitted beam to oscillate in a corresponding pattern. In response, the received signal amplitude of the image on the focal plane of the receive telescope also oscillates in the same pattern. By comparing the phase of the received signal with the phase of the movement of the transmitted beam, the origin of the transmitted beam dithering pattern can be moved until the maximum amplitude of the transmitted beam is incident upon the receive optical fiber. In another embodiment, the receive optical fiber is dithered in a variable pattern to locate the point of maximum received signal amplitude. Using the aforementioned phase comparison technique, the receive optical fiber is moved progressively closer to the point of maximum amplitude of the received signal on the receive focal plane. In cases where atmospheric disturbances alter the path of the transmitted beam, the transmitted beam and the receive optical fiber may both be dithered to achieve coincidence between the point of maximum signal amplitude and the receive optical fiber.