Laser space communication birefringence filtering method based on beam deflector
A technology of laser communication and shifter, applied in the coupling of optical waveguides, free space transmission, etc., can solve problems such as extinction, signal intensity fluctuation, and change of light wave polarization state, and achieve the effect of simple structure and simplified structure
Active Publication Date: 2013-01-09
西安中科天塔科技股份有限公司
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Problems solved by technology
However, for space communication, when the optical signal passes through the atmosphere or sea water, the existence of scattering will change the polarization state of the light wave. Since the light wave in the birefringence filter must pass through the polarizer to achieve effective filtering, this will cause polarization extinction loss. Yes, causing fluctuations in signal strength, or even complete extinction
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[0043] Example: The signal light is in any polarization state
[0044] refer to figure 1 . The birefringence filtering of the spatial signal light with any polarization state is completed according to the following steps.
[0045] (1) Collection and convergence of space signal light. refer to figure 2 , using the optical antenna to collect the optical signal reaching its surface and converging on the focal point of the optical antenna, the equivalent focal length of the optical antenna is f 1 , the caliber is D.
[0046] (2) Collimation of the beam. refer to figure 2 , a focal length f is connected behind the optical antenna 2 The optical lens, the focal point of the object space of the lens coincides with the focal point of the image space of the optical antenna, so that the signal light becomes parallel light after passing through the lens, and the spot diameter d≈(D×f 2 / f 1 ), by reducing the ratio f of the focal length of the optical lens and the optical antenn...
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The invention discloses a laser space communication birefringence filtering method based on a beam deflector. The method uses the beam deflector to separate the optical signal into two linearly polarized lights crossing along a polarization direction, uses a half wavelength plate to rotate one beam light to rotate 90 degrees along the polarization direction, and uses a retarder to regulate an optical path of the other beam light in order to enable polarization directions of lights to be uniform and the optical path difference to be equal; finally, the method enables the polarized lights to pass through a birefringence filter to achieve optical filtering; two optical signals are detected and added in the electric domain to obtain final communication signal. The method has no polarization extinction loss during optical filtering, has a simple structure and reduces popularization difficulty.
Description
technical field [0001] The invention belongs to the field of space laser communication. In particular, it relates to an optical filtering method for laser communication. Background technique [0002] Due to the advantages of large communication capacity, good directivity, small size, small volume and low power consumption, space laser communication has become an important research topic in the field of space communication. Most of the existing space laser communication uses intensity modulation and direct detection to communicate. When light waves propagate in space, due to the influence of stray light such as sunlight, moonlight, starlight, atmosphere and seawater scattering, the detection signal is mixed with strong background noise. This will increase the error rate of communication and reduce the quality of communication. Adding a narrow-band optical filter system to the communication receiving terminal can effectively suppress the influence of background noise and im...
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IPC IPC(8): G02B6/27H04B10/11
Inventor 韩彪谢小平黄新宁胡辉汪伟段弢赵卫
Owner 西安中科天塔科技股份有限公司