公开(公告)号：JP2003177335A

公开(公告)日：2003-06-27

申请号：JP2002272979

申请日：2002-09-19

Applicant: LUCENT TECHNOLOGIES INC

Inventor： KURCZYNSKI PETER ,  TYSON JOHN A

IPC: G02B5/10 ,  G02B26/06 ,  G02B26/08

Abstract: PROBLEM TO BE SOLVED: To disclose an adaptive optics system whereby at least one mirror in the system is manipulated using electrostatic force to selectively attract or repel a portion of the mirror to or from a particular electrode, respectively. SOLUTION: This attraction or repulsion is accomplished by mechanically coupling a bound charge layer of dielectric material to at least one surface of the mirror and then placing a voltage across an electrode in an array of electrodes positioned near that mirror. The charge in the dielectric material combined with a suitable electric field makes it possible to attract portions of the mirror in one instant and then, by changing the sign on the voltage placed across the electrode, to repel those same portions in the next instant. COPYRIGHT: (C)2003,JPO

公开(公告)号：JP2003124890A

公开(公告)日：2003-04-25

申请号：JP2002188853

申请日：2002-06-28

Applicant: LUCENT TECHNOLOGIES INC

Inventor： PRESBY HERMAN MELVIN ,  TYSON JOHN A

IPC: G02B26/08 ,  G02B17/00 ,  H04B10/10 ,  H04B10/118 ,  H04B10/22 ,  H04B10/105

Abstract: PROBLEM TO BE SOLVED: To provide a free space optical communication system whereby the optics of a transmit telescope are manipulated using adaptive optics to compensate for wave front distortion of a light beam transmitted by a transmit telescope. SOLUTION: Wave front distortion is manifested at the receive telescope as a deviation from the normal orthogonal orientation of the wave front of the transmitted light beam relative to its line of travel. This deviation may be detected, for example, by a wave front sensor, such as a Shack-Hartman sensor, which identifies the slope or beam tilt, of discrete sections of the transmitted beam. The optics of the receive telescope can then be deformed in such a way as to cancel the wave front distortion and correspondingly reduce the resulting distortion of the received signal.

公开(公告)号：JP2002198909A

公开(公告)日：2002-07-12

申请号：JP2001309310

申请日：2001-10-05

Applicant: LUCENT TECHNOLOGIES INC

Inventor： PRESBY HERMAN MELVIN ,  TYSON JOHN A

IPC: G02B17/00 ,  H04B10/10 ,  H04B10/118 ,  H04B10/22 ,  H04B10/105

Abstract: PROBLEM TO BE SOLVED: To provide a point-to-multipoint free space wireless optical communication system. SOLUTION: In an optical communication system having a concave surface primary mirror 310 and a convex surface secondary mirror 320 each having a hyperbolic surface, the convex surface secondary mirror 320 is secured. The convex surface secondary mirror 320 has a large focal surface 330 enabling to adjust the length between a transmitter and a receiver automatically. In the focal surface 330, an n×n optical fiber array 350 is disposed, which enables point-to-multipoint communication using a single light telescope. Each fiber in the n×n array 350 of the transmission telescope can focus a different reception telescope to transmit light toward each reception telescope through a different path. Similarly, for a multipoint-to-point communication system, the n×n array 350 is disposed within the surface 330 and each fiber in the n×n array 350 receives light from each transmission telescope through a different path.

公开(公告)号：JP2003124883A

公开(公告)日：2003-04-25

申请号：JP2002188851

申请日：2002-06-28

Applicant: LUCENT TECHNOLOGIES INC

Inventor： PRESBY HERMAN MELVIN ,  TYSON JOHN A

IPC: G02B23/02 ,  G02B26/08 ,  H04B10/02 ,  H04B10/10 ,  H04B10/118 ,  H04B10/18 ,  H04B10/22 ,  H04B10/105

Abstract: PROBLEM TO BE SOLVED: To provide a free space optical communication system whereby the optics of a transmit telescope are manipulated using adaptive optics to precompensate for wave front distortion of a light beam transmitted by a transmit telescope. SOLUTION: Wave front distortion is manifested at the receive telescope as a change in at least one characteristic of the image of the received signal such as, for example, a reduction in the amplitude of the received signal. A mirror of the transmit telescope is deformed in such a way as to reduce the wave front distortion and correspondingly increase the resulting amplitude of the received signal.

公开(公告)号：JP2002202476A

公开(公告)日：2002-07-19

申请号：JP2001309302

申请日：2001-10-05

Applicant: LUCENT TECHNOLOGIES INC

Inventor： PRESBY HERMAN MELVIN ,  TYSON JOHN A

IPC: G02B23/02 ,  G02B17/06 ,  G02B27/00 ,  G02B27/18 ,  H01L31/12 ,  H04B10/112 ,  H04B10/10 ,  H04B10/105 ,  H04B10/22

Abstract: PROBLEM TO BE SOLVED: To provide an optical telescope for wireless optical communication system provided with at least two aspherical mirrors. SOLUTION: A mirror configuration enables a primary and a secondary mirrors to be positioned closer together than conventional designs, and accordingly, enables a very compact system. The mirrors are thin and lightweight, which enables the realization of a lightweight telescope unit. The mirror configuration provides a larger focal plane, which enables automatic control between a transmitter and a receiver with a fixed mirror design, and further contributes to a lower fabrication cost. In addition, these mirrors can be designed so as to have larger diameters, which enables the transmission of high beam intensities at eye-safe levels since the energy is spread over a large area.

公开(公告)号：JP2002164852A

公开(公告)日：2002-06-07

申请号：JP2001307406

申请日：2001-10-03

Applicant: LUCENT TECHNOLOGIES INC

Inventor： PRESBY HERMAN MELVIN ,  TYSON JOHN A

IPC: H04B10/10 ,  H04B10/118 ,  H04B10/22 ,  H04B10/105

Abstract: PROBLEM TO BE SOLVED: To prevent a communication connectivity from being lost which is caused by deviation at initial alignment or during communication operation in a free space optical communication system. SOLUTION: A free space optical communication system is provided wherein a transmission telescope and a reception telescope are so aligned that the maximum power point of a received optical beam is incident on an optical fiber provided at a specified point on the focal plane of the reception telescope. This is attained by moving a transmission optical fiber to a point in front of the focal plane of the transmission telescope until at least a part of the beam is incident on the reception optical fiber so that the transmission beams is made divergent. The transmission optical fiber gradually moves to before or behind the focal plane of the transmission telescope in response to the reception power measurement in the reception telescope. Thus, the degree of divergence is decreased to provide a higher signal per unit area of the reception telescope.

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：JP2002164853A

公开(公告)日：2002-06-07

申请号：JP2001309524

申请日：2001-10-05

Applicant: LUCENT TECHNOLOGIES INC

Inventor： PRESBY HERMAN MELVIN ,  TYSON JOHN A

IPC: H04B10/10 ,  H04B10/118 ,  H04B10/22 ,  H04B10/105

Abstract: PROBLEM TO BE SOLVED: To provide a free space optical communication system wherein the reception power at a reception optical fiber is reduced by mutually adjusting so that a transmitted optical beam and the reception optical fiber cross each other not at the focal point of the transmitted beam but at a divergent point when a specified power threshold is exceeded. SOLUTION: The transmitted beam is diverged by moving a transmission optical fiber to a point before the focal plane of a transmission telescope along the length axis of the telescope until at least a part of the beam is incident on the reception optical fiber. As a result, the beam enlarges the cross-sectional area of the point where the beam is incident on the reception telescope. Thus, the cross-section electric power per unit area of the transmitted beam reduces, and the power which is incident on the reception optical fiber is reduced accordingly.

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：DE60100183T2

公开(公告)日：2004-03-11

申请号：DE60100183

申请日：2001-04-30

Applicant: LUCENT TECHNOLOGIES INC

Inventor： PRESBY HERMAN MELVIN ,  TYSON JOHN A

IPC: H04B10/10 ,  H04B10/118 ,  H04B10/22