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Laser pulse transmission time widening and channel transfer function measuring method in turbulent atmospheric channel

A technology of laser pulse and transfer function, which is applied in the direction of transmission monitoring/testing/fault measurement system, etc., to achieve the effect of easy theoretical analysis

Inactive Publication Date: 2014-03-05
CHANGCHUN UNIV OF SCI & TECH
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  • Claims
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Problems solved by technology

This method requires the use of a laser signal transmitting device and a laser signal receiving and detecting device

Method used

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  • Laser pulse transmission time widening and channel transfer function measuring method in turbulent atmospheric channel
  • Laser pulse transmission time widening and channel transfer function measuring method in turbulent atmospheric channel
  • Laser pulse transmission time widening and channel transfer function measuring method in turbulent atmospheric channel

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Embodiment Construction

[0031] In order to make the features and advantages of the present invention clearer, the present invention will be further described below in conjunction with specific examples.

[0032] The narrow linewidth laser in the 800nm ​​band is selected as the laser, the Tektronix AWG7000 arbitrary waveform generator is selected as the signal generator, the lithium niobate electro-optic modulator from Phot1ine is selected as the electro-optic modulator, the PIN photodiode is selected as the photodetector, and the Agilent digital oscilloscope MSO9404A is selected as the oscilloscope.

[0033] The method needs to use a laser signal emitting device and a laser signal receiving and detecting device. Laser signal transmitters such as figure 1 As shown, it includes a laser 101 , a signal generator 102 , an electro-optic modulator 103 , and an optical transmission system 104 . Laser signal receiving and detecting devices such as figure 2 As shown, it includes an optical receiving system ...

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Abstract

The invention discloses a laser pulse transmission time widening and channel transfer function measuring method in a turbulent atmospheric channel, and belongs to the technical field of wireless laser communication. The method includes the steps that a narrow-band gauss optical pulse sequence is emitted to the turbulent atmospheric channel for transmission, detection and waveform sampling are carried out on the optical pulse sequence at a receiving end, and sampling data are stored as files; on the basis that the pulse waveform sampling data are subjected to ensemble average, ensemble average gauss pulse waveform parameters are calculated through the data fitting method, and then the transfer function of the turbulent atmospheric channel is solved. An analytical expression of the transfer function of the turbulent atmospheric channel can be obtained by using the method, so that theoretical analysis performed on characteristics of the turbulent atmospheric channel based on actual measurement data becomes easier.

Description

technical field [0001] The invention belongs to the technical field of wireless laser communication, and relates to a laser pulse transmission time extension in a turbulent atmospheric channel and a channel transfer function measurement method. Background technique [0002] Wireless laser communication has the advantages of good confidentiality, flexible deployment, and no need for frequency band application. It has attracted widespread attention in recent years. When the wireless laser communication system works in the atmosphere of the earth, the atmosphere of the earth will cause the laser pulse to broaden in time. For wireless laser communication systems using intensity modulation / direct detection, the time stretching of communication laser pulses will cause intersymbol interference, resulting in a decrease in the performance of the communication system. Therefore, it is of great significance to measure the laser pulse time broadening in the actual turbulent atmospheric...

Claims

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Application Information

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IPC IPC(8): H04B10/07
Inventor 陈纯毅杨华民蒋振刚李华范静涛娄岩
Owner CHANGCHUN UNIV OF SCI & TECH
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