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Spatial laser communication all optical signal intensity equalizing device

An optical signal and equalization technology, applied in the field of optical communication, achieves the effect of simple production, overcoming slow response speed and inflexibility, and reducing optical power requirements

Inactive Publication Date: 2008-07-09
BEIHANG UNIV
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AI Technical Summary

Problems solved by technology

This kind of liquid crystal with high nonlinear coefficient may produce obvious optical Kerr effect, so it can be used in the field of nonlinear optics, but it has not yet been reported that it is used for all-optical intensity equalization in space laser communication

Method used

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  • Spatial laser communication all optical signal intensity equalizing device
  • Spatial laser communication all optical signal intensity equalizing device
  • Spatial laser communication all optical signal intensity equalizing device

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Embodiment Construction

[0023] The equalization device shown in Figure 1 includes a focusing lens, a liquid crystal tank, a nematic liquid crystal mixed solution and a diaphragm. The liquid crystal tank further includes a base layer, a transparent conductive layer, a polymer layer and an adhesive sealing ring.

[0024] The preparation method of nematic liquid crystal mixed solution is as follows:

[0025] 1. Mixed liquid crystal E7 composed of 4 different liquid crystals, of which 5CB accounted for 51%, while 7CB, O8CB and 5CT accounted for 25%, 16% and 8% respectively;

[0026] 2. Add methyl red (Methyl-Red) to the liquid crystal E7, the concentration is 0.8%;

[0027] 3. Ultrasonic dispersion of SWNT in alcohol at a concentration of 0.005%;

[0028] 4. Drop the SWNT / alcohol solution into the liquid crystal E7 that has dissolved the methyl red to ensure its concentration is 0.002%;

[0029] 5. Heat the above mixed solution at 60°C until the alcohol is completely volatilized and the carbon tubes a...

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Abstract

The invention discloses a device for realizing equilibrium in strength of full optical signals, which can be applied in a space laser communication system. The device is made of a nematic liquid crystal mixture with third-order nonlinear optical characteristics, utilizes the Kerr optical effect caused by the third-order nonlinearity thereof to achieve spatial self-phase modulation related to light intensity and to form spatial optical field distribution related to the light intensity, and achieves the equilibrium in intensity changes of input light through controlling light penetration areas; thereby obtaining output signals with similar light intensity distributions.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to a device for all-optical signal intensity equalization for space laser communication Background technique [0002] In free space laser communication systems, light waves propagate in space media such as the atmosphere. In the atmosphere, the inhomogeneity and random fluctuation of the distribution of temperature, air flow, aerosol, etc. cause the optical refractive index to have an obvious random distribution in space and random changes with time, resulting in turbulence effects. For the optical signal transmitted in the atmosphere, when passing through the above-mentioned random atmospheric medium, the phase of the beam at different spatial positions will be randomly affected, resulting in its intensity, phase and propagation direction and other parameters fluctuating randomly with the change of turbulent conditions . For medium and long-distance free-space optic...

Claims

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Application Information

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IPC IPC(8): G02F1/35G02F1/361H04B10/02H04B10/11
Inventor 赵欣郑铮
Owner BEIHANG UNIV
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