Heterodyne detection system and method for wireless laser communication

A technology of heterodyne detection and wireless laser, applied in the field of communication, can solve the problem of low sensitivity, achieve the effect of improving sensitivity, increasing communication distance, and achieving low conditions

Active Publication Date: 2013-04-17
XIAN UNIV OF TECH
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  • Abstract
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  • Claims
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Problems solved by technology

[0010] The purpose of the present invention is to provide a wireless laser communication heterodyne detecti

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  • Heterodyne detection system and method for wireless laser communication
  • Heterodyne detection system and method for wireless laser communication
  • Heterodyne detection system and method for wireless laser communication

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Embodiment Construction

[0040] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0041] The structure of the wireless laser communication heterodyne system of the present invention is as follows image 3 As shown, it includes a light receiving antenna 1 , a fiber coupling module 2 , a local oscillator laser 3 , a modulation circuit 4 , a 3dB coupler 5 , a photodetector 6 , a digital signal processing module 7 , and a digital interface 8 . Optical receiving antenna 1, fiber coupling module 2, 3dB coupler 5, photodetector 6, digital signal processing module 7 and digital interface 8 are connected in sequence, local oscillator laser 3 is connected to 3dB coupler 5; decoder module is connected to digital Interface 4 is connected;

[0042] The light-receiving antenna 1 is a single-convex lens, which is used to receive the light signal in the atmospheric channel and focus the light spot.

[0043] Coupling module 2 is composed...

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Abstract

The invention discloses a heterodyne detection system for wireless laser communication. The system comprises an optical receiving antenna, an optical fiber coupling module, a 3dB coupler, a photoelectric detector, and a digital interface of a digital signal processing module, which are connected sequentially. The system further comprises a local oscillator laser and a modulating circuit. The local oscillator laser is connected with the 3dB coupler, and a decoder module is connected with the digital interface. Heterodyne of a subcarrier at a sending terminal and that at a receiving terminal is realized at the receiving terminal to generate a cross item of intermediate frequency. Base band information is restored by demodulating an intermediate frequency signal. The system and method solve the problem that current optical heterodyne detection structure is complex and hard to realize, and have the characteristics of remoter communication distance, larger capacity, easier implementation and the like.

Description

technical field [0001] The invention belongs to the technical field of communication and relates to a wireless laser communication heterodyne detection system. Background technique [0002] Wireless laser communication will become the main technology of the next generation of laser communication. Compared with optical fiber communication, it has the main advantage of convenient structure, and it will become the main technology of the last mile broadband access. Intensity modulation / direct detection technology is mostly used in wireless laser communication now, but with the increase of communication distance, intensity modulation / direct detection technology can no longer meet people's needs. Wireless optical communication has a very large market demand, and coherent communication has become the focus of people's research. However, due to the complexity of coherent optical communication systems and harsh conditions, experiments in inter-satellite communication have only begun....

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Application Information

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IPC IPC(8): H04B10/07H04B10/64
Inventor 柯熙政陈锦妮
Owner XIAN UNIV OF TECH
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