公开(公告)号：CA2395797A1

公开(公告)日：2003-03-19

申请号：CA2395797

申请日：2002-07-26

Applicant: LUCENT TECHNOLOGIES INC

Inventor： TYSON JOHN ANTHONY ,  KURCZYNSKI PETER

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

Abstract: An adaptive optics system is disclosed whereby at least one mirror in t he system is manipulated using electrostatic force to selectively attract or repel a portion of the mirror to or from a particular electrode, respectively. This attraction or repulsion is accomplished by mechanically coupling a bound charge layer o f 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. T he 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 portion s in the next instant.

公开(公告)号：CA2357927A1

公开(公告)日：2002-04-05

申请号：CA2357927

申请日：2001-09-27

Applicant: LUCENT TECHNOLOGIES INC

Inventor： TYSON JOHN ANTHONY ,  PRESBY HERMAN M

IPC: G02B17/00 ,  H04B10/10 ,  H04B10/118 ,  H04B10/22 ,  H04B10/04 ,  H04B10/06

Abstract: A free-space wireless optical communication system is disclosed that utilizes a telescope design having aspherical mirrors, such as a Richey- Chetrien (RC) telescope. RC telescopes are characterized by a concave primary mirror and a convex secondary mirror each having a hyperbolic shape. The disclosed mirror configuration provides a larger focal plane that allows for automatic alignment between a transmitter and receiver with a stationary or fixed mirror design, further contributing to a lower fabrication cost. Among other benefits, the larger focal plane permits an n x n fiber array to be positioned in the focal plane of the RC optical telescope, thereby enabling point-to- multipoint communications with a single optical telescope. Each fiber in the n x n fiber array of a transmitting telescope can be focused on a different receiving telescope in a wireless optical communication system. In this manner, each fiber in the n x n fiber array sends optical energy over a distinct path to address a given receiving telescope Likewise, for a multipoint-to-point communication system, an n x n fiber arr ay can be positioned in the focal plane 330 of the RC optical receiving telescope, wit h each fiber in the n x n fiber array receiving optical energy over a distinct path from a give transmitting telescope. A number of fabrication techniques are also disclose d that permit the optical telescopes of the present invention to be fabricated at a reasonable cost that permits such optical telescopes to be deployed in wireless optical communication systems.

公开(公告)号：CA2357660A1

公开(公告)日：2002-04-05

申请号：CA2357660

申请日：2001-09-24

Applicant: LUCENT TECHNOLOGIES INC

Inventor： PRESBY HERMAN MELVIN ,  TYSON JOHN ANTHONY

IPC: H04B10/10 ,  H04B10/118 ,  H04B10/22 ,  H04B10/04 ,  H04B10/06

Abstract: A free space optical communication system is disclosed whereby a transmit telescope and a receive telescope are aligned such that the point o f maximum power of the received light beam is incident upon the optical fiber located at a specific point on the focal plane of the receive telescope. Suc h incidence is achieved by causing the transmitted beam to diverge by moving the transmit optical fiber to a point in front of the focal plane of the transmit telescope until at least a portion of the beam is incident upon the receive optical fiber. The transmit telescope and/or the receive telescope (or, alternatively, only the respective optical fibers of those telescopes) are then moved such that the point of maximum received power for that degree of divergence is incident upon the receive optical fiber. The transmit optical fiber, in response to received power measurements at the receive telescope, then incrementally moves back toward the focal plane of the transmit telescope thereby reducing the degree of divergence and achieving a greater signal per unit area at the receive telescope. As the divergence is reduced, the position of the either the transmit telescope and/or the receive telesco pe (or, respectively, the optical fibers) is incrementally adjusted to maximize the received power of the received signal which is incident upon the receive optical fiber for each degree of divergence. By monitoring received signal power this iterative process continues until the transmit and receive telescopes are aligned such that the transmitted beam is focused so as to maximize the received power that is incident upon the receive optical fiber.