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Novel Fresnel optical antenna emission system

An optical antenna and transmitting system technology, which is applied in the field of optical communication and can solve the problems of energy loss in the center of the secondary mirror of the antenna.

Inactive Publication Date: 2016-06-01
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
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Problems solved by technology

[0007] The present invention aims at the deficiencies existing in the existing optical antenna, solves the key technical problem of energy loss in the center of the secondary mirror of the antenna, and provides a new Fresnel optical antenna transmitting system structure

Method used

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  • Novel Fresnel optical antenna emission system

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Embodiment Construction

[0019] The present invention will be further elaborated and illustrated below in conjunction with the accompanying drawings and embodiments.

[0020] figure 1 As shown, it is a structural block diagram of a Fresnel optical antenna transmitting system of the present invention, and the system is composed of an amplitude-type Fresnel zone plate and a Cassegrain optical antenna. The circular Fresnel zone plate is fixed in the central hole of the primary mirror of the antenna. The collimated plane light wave is incident on the Fresnel zone plate and then focused. The main focus coincides with the left focus of the secondary mirror, and a The dark hollow beam is transmitted by the optical antenna to form a collimated hollow beam.

[0021] figure 2 As shown, the schematic diagram of a plane wave illuminating a circular Fresnel optical zone plate. The zone plate is a special grating composed of a group of light-transmitting and opaque concentric rings alternately spaced, and the c...

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Abstract

The invention belongs to the optical communication technology field, to be specific, relates to a novel Fresnel optical antenna emission system constituted by an amplitude-type Fresnel wave zone plate and a Cassegrain optical antenna. The Fresnel wave zone plate is constituted by light-transmitting wave bands and light-proof wave bands, which are arranged in an alternated manner, and is disposed in a central circular hole of an antenna paraboloid primary mirror, and is used for the focusing of the incident plane waves. A main focus is superposed with a left focus of a rotary hyperboloid secondary mirror, and the light spot center generated on the secondary mirror is the dark spot, and therefore the large central energy loss of the light reflected by the antenna secondary mirror to the primary mirror can be effectively prevented. After the light beam is reflected sequentially by the secondary mirror and the primary mirror, the collimation hollow light beam can be transmitted in the free space. The key technical problem of the conventional optical antenna of the secondary mirror central energy loss can be solved, and the improvement of the transmission efficiency and the emission precision of the emission antenna of the optical communication system can be facilitated, and the small-sized integration of the optical communication emission system can be easily realized.

Description

technical field [0001] The invention belongs to the technical field of optical communication, in particular to a novel Fresnel optical antenna transmitting system. Background technique [0002] The main function of the optical antenna system is to expand the laser beam and further compress the divergence angle. Optical antennas are key transmitting and receiving subsystems in the field of optical communication technology. High-precision collimation technology and high transmission efficiency are important guarantees for optical antenna systems to achieve long-distance transmission and high tracking accuracy. [0003] Space optical communication usually involves multi-wavelength transmission, and a reflective system without chromatic aberration (Cassegrain type telescope) is widely used as the transmitting and receiving antenna, because a large amount of energy of the laser Gaussian beam is collected in the center (light) during the axial transmission process. On the axis, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B17/08G02B27/00H01Q19/10
CPCG02B17/0804G02B27/0012H01Q19/10
Inventor 江萍杨华军李军
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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