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Experimental device based on threshold value of atmospheric parameter optimization space laser communication system

A technology for optimizing space and atmospheric parameters, applied in free space transmission, transmission monitoring/testing/fault measurement systems, etc., can solve problems such as inability to accurately estimate the best decision threshold for space laser communication

Active Publication Date: 2013-03-13
ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0007] The purpose of the present invention is to provide an experimental device for optimizing the decision threshold of the space laser communication system based on atmospheric parameters, so as to solve the problem that the experimental device for testing the influence of the atmosphere on communication performance cannot accurately estimate the optimal decision threshold of space laser communication in the prior art

Method used

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  • Experimental device based on threshold value of atmospheric parameter optimization space laser communication system
  • Experimental device based on threshold value of atmospheric parameter optimization space laser communication system
  • Experimental device based on threshold value of atmospheric parameter optimization space laser communication system

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Embodiment 1

[0037] image 3 Be an embodiment of the present invention; The modulation signal source output signal used by the experimental device is a TTL signal in the present embodiment; The semiconductor laser output power 100 mW, the output wavelength is 532 nm; The transmittance of the beam expander is 0.8; The receiving aperture of the Green Telescope is 100 mm, and the transmittance is 0.8; the photodetector is APD silicon photodiode AD500-8, the responsivity is 50 A / W, the working bandwidth is 0.1 GHz, the noise figure is 2.5, and the multiplication factor is 100 , the preamplification factor is 100; the sampling frequency of the acquisition card in the computer is 100 MHz.

[0038] In this embodiment, the experimental device is calibrated before the first use. Install the transmitting terminal and the receiving terminal at a close distance indoors, adjust the transmitting antenna so that the laser can shine on the receiving antenna, and control the laser power to prevent the det...

Embodiment 2

[0045] Such as Figure 4 As shown, in this embodiment, the parts other than the computer of the transmitting terminal and receiving terminal of the experimental device are omitted, and the computer equipped with the calculation program is used as a functional module to connect to the receiving terminal of the space laser communication system to be tested. according to Figure 4 The structure connects the output voltage of the receiving terminal to the computer, and at the same time connects the calculation results output by the computer to the receiving terminal to update its decision threshold. Other operation steps and calculation process are the same as those in Embodiment 1, and the optimal threshold and bit error rate of the communication system under the current atmospheric conditions can also be estimated.

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Abstract

The invention discloses an experimental device based on a threshold value of an atmospheric parameter optimization space laser communication system. The experimental device comprises a sending terminal and a receiving terminal; a modulation signal source of the sending terminal outputs a coded signal to control a semiconductor laser to send a Gaussian laser beam; the Gaussian laser beam is fixed on a beam expander arranged on an optical bench through optical fiber input and enters atmospheric turbulence after collimation and beam expanding, is received by a Cassegrain telescope at the receiving terminal after being transmitted for a distance in the atmospheric turbulence, and enters coupled optical fibers of a photoelectric detector after focusing; and a voltage signal output by the photoelectric detector is transmitted to a computer, and the computer processes collected data according to a calculation program and outputs the optimal fixed threshold value UST and bit error ration (BER) of the space laser communication system under the current condition. The device has no special requirements for optical elements, and is simple in structure, convenient to operate and good in optimization effect; and simultaneously, the calculation method for determining the threshold value is good in optimization effect and simple to implement.

Description

technical field [0001] The invention relates to the field of space laser communication technology, in particular to a method for estimating on-off keying (OOK) intensity modulation / direct detection (IM / DD) by measuring parameters related to atmospheric characteristics such as logarithmic light intensity fluctuation variance and received signal mean value An experimental setup for the optimal decision threshold of the space laser communication system in the current atmospheric channel. Background technique [0002] Space laser communication has the advantages of low cost, flexible installation, large communication capacity, no need for frequency application and anti-electromagnetic interference. It has become a research hotspot in the field of wireless communication. On-off keying (OOK) intensity modulation / direct detection (IM / DD) One of the most commonly used working methods at present. In a typical system using this working mode, the bit error rate of the system mainly de...

Claims

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Application Information

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IPC IPC(8): H04B10/07H04B10/11
Inventor 李菲吴毅侯再红张守川靖旭秦来安
Owner ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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