Polarization labeling-based free space laser communication optical denoising method

A free space and laser communication technology, applied in the direction of free space transmission, etc., can solve the problems of small light wave transmittance, background light cannot be filtered out, and is not conducive to long-distance transmission of free space communication optical signal detection, etc., to achieve simple structure, Ease of implementation and promotion, reduction of system complexity and difficulty of use

Active Publication Date: 2015-07-15
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0004] Although the above three optical filtering methods can filter out background light noise with a wavelength different from that of the communication band to a certain extent, they cannot filter out background light with the same wavelength as the center wavelength of the filter.
In addition, the narrower the transmission bandwidth of the optical filter, the smaller the light wave transmittance, which is not conducive to the detection of free-space communication optical signals under long-distance transmission and strong background noise

Method used

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  • Polarization labeling-based free space laser communication optical denoising method
  • Polarization labeling-based free space laser communication optical denoising method
  • Polarization labeling-based free space laser communication optical denoising method

Examples

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Embodiment

[0049] Embodiment: 1550nm band free-space communication based on left-handed circular polarization marker.

[0050] refer to figure 1 . Follow the steps below to complete the 1550nm band free-space communication based on left-handed circular polarization markers.

[0051] 1] Generate a communication optical signal. refer to Figure 2.1 In the communication transmitting terminal, the electro-optic modulator in the 1550nm band is controlled by the communication data electric signal to modulate the light intensity output by the laser, and the output light of the laser is vertically injected into the electro-optical modulator. , corresponding to the communication logic "1", when the electrical signal is low level, the electro-optic modulator has no laser output, corresponding to the communication logic "0"; or when the electrical signal is high level, the electro-optic modulator has no laser output, corresponding to the communication logic " 0", when the electrical signal is l...

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Abstract

The invention provides a polarization labeling-based free space laser communication optical denoising method. According to the method, polarization labeling is firstly carried out on laser communication signals at a communication transmitting terminal to enable the polarization state to be left-handed circular polarization and a right-handed circular polarization, laser signals with polarization labeling are recognized at a communication receiving terminal, and background laser noise in the receiving signals are removed. The background laser noise in free space laser communication signals can be effectively removed, the device is mature, the structure is simple, and the promotion difficulty is reduced.

Description

technical field [0001] The invention belongs to the field of space laser communication. Specifically, it involves an optical denoising method, a transmitting terminal and a receiving terminal for space laser communication. Background technique [0002] Free space laser communication has become an important research topic in the field of wireless communication because of its advantages such as good directionality, large communication capacity, small size and power consumption. Due to the influence of background noise light such as sunlight, moonlight, and starlight, the detection signal of the communication receiving terminal is mixed with strong background light noise. This will increase the error rate of communication and reduce the quality of communication. In the prior art, optical filtering is often used to eliminate the influence of background light noise, that is, only optical signals within the wavelength range of communication light are allowed to enter the photoel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/11
Inventor 韩彪汪伟胡辉苏玉龙魏安海赵卫谢小平
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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