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One-point-to-multipoint free space radio optical communication system

A wireless communication system and optical signal technology, applied in the field of improved optical telescopes, can solve the problems of unspecified optical parts, etc., and achieve the effect of reducing production costs

Inactive Publication Date: 2002-05-01
LUCENT TECH INC
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  • Abstract
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Problems solved by technology

Additionally, the government does not regulate the optical portion of the spectrum

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  • One-point-to-multipoint free space radio optical communication system
  • One-point-to-multipoint free space radio optical communication system
  • One-point-to-multipoint free space radio optical communication system

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Embodiment Construction

[0015] The present invention provides an improved optical telescope for a wireless optical communication system, which can meet the above-mentioned goals of improving bandwidth, link distance, and reliability relative to conventional designs. According to a feature of the present invention, a Richey-Chetrien (RC) telescope is used in the wireless optical communication system, which is further discussed with reference to FIG. 2 . Previously, RC telescopes were only used on large astronomical telescopes, including the Hubble Space Telescope (Hubble Space Telescope). For a detailed discussion of the general applications and parameters of RC telescopes, see, eg, Daniel J. Shroeder, Astronomical Optics, 94-109 (Academic Press, 1987), incorporated herein by reference. In general, RC telescopes are characterized by a concave primary mirror and a convex secondary mirror, each having a hyperbolic shape.

[0016] Fig. 2 shows an RC optical telescope 200 according to the present inventi...

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Abstract

A free-space wireless optical communication system is disclosed that utilizes a telescope design having aspherical mirrors, such as a Ritchey-Chretien (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.

Description

technical field [0001] The present invention relates to the field of free-space wireless optical communication, and more specifically relates to an improved optical telescope used in a free-space wireless optical communication system. Background technique [0002] In wireless optical communication systems, optical signals propagate in free space. In contrast to radio frequency (RF) communication systems, optical wireless communication systems are extremely directional. Therefore, precise alignment is required between the transmitting unit and the receiving unit, often referring to the transmitting and receiving telescopes respectively. However, the highly directional nature of wireless optical communication systems is conducive to improving security, because optical signals can only be intercepted along the transmission optical path. In addition, the optical portion of the spectrum is not regulated by the government. So unlike comparable radio frequency (RF) wireless comm...

Claims

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Application Information

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IPC IPC(8): G02B17/00H04B10/11H04B10/118
CPCH04B10/1121
Inventor 赫尔曼·梅尔文·普来斯拜约翰·安舍尼·泰森
Owner LUCENT TECH INC
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