Method for restraining atmosphere turbulence interference in free-space optical communication

A technology of atmospheric turbulence and free space, applied in free space transmission, space transmit diversity, electrical components, etc., can solve problems such as channel fading, achieve the effects of eliminating mutual interference, reducing atmospheric turbulence interference, and improving accuracy

Inactive Publication Date: 2017-01-25
NANTONG UNIVERSITY
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Problems solved by technology

However, these methods simply treat atmospheric turbulence as a noise interference that only affects the phase parameter of OAM light, and try to remove this noise interference
However, the interference of atmospheric turbulence is far from simply c

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  • Method for restraining atmosphere turbulence interference in free-space optical communication
  • Method for restraining atmosphere turbulence interference in free-space optical communication
  • Method for restraining atmosphere turbulence interference in free-space optical communication

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Embodiment Construction

[0035] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0036] figure 1 A kind of space diversity suppression OAM atmospheric turbulence interference model proposed for the present invention, this model is as figure 1 Shown from left to right include:

[0037] N OAM state converters are used to load N channels of user signals to OAM lights, and each channel of OAM lights is orthogonal to each other;

[0038] 1 OAM state multiplexer, used to combine N channels of OAM light to obtain OAM state multiplexed light;

[0039] M atmospheric turbulence channels are used to perform atmospheric turbulence interference space diversity on the OAM state multiplexed light;

[0040]M OAM state demultiplexers are used to demultiplex the OAM state multiplexed light disturbed by atmospheric turbulence to obtain N channels of OAM light respectively;

[0041] M OAM state converters respectively demodulate the OAM li...

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Abstract

The invention relates to a method for restraining atmosphere turbulence interference in free-space optical communication, comprising the following steps: loading a user signal on OAM (Operation Administration and Maintenance) light for transmission, transmitting OAM light of multipath loading information in a combined manner through different atmosphere turbulence channels, demultiplexing and demodulating the distorted OAM light of output multipath of each atmosphere turbulence channel at a receiving terminal, as multipath OAM light of a transmitting terminal in a multipath signal transmission model passes through the different atmosphere turbulence channels, and fading characteristics of the respective channels are similar to a multi-antenna fading channel model, a space diversity technology is adopted to restrain the atmosphere turbulence interference, the receiving terminal restores useful signals of respective users to the maximum extent through the demultiplexed and demodulated user information and a space diversity and combination technology, influence of the atmosphere turbulence interference on system-received signals is reduced, and system reliability is improved. Therefore, the invention provides a reference for the practicability of free-space orbit angular momentum multiplexing optical communication.

Description

technical field [0001] The present invention relates to a method for suppressing atmospheric turbulence interference in free space optical communication, more specifically to a method for suppressing atmospheric turbulence interference in free space optical communication with orbital angular momentum state multiplexing, and the research content belongs to optical communication in signal processing communication technology field. Background technique [0002] State multiplexing systems based on Orbital Angular Momentum (OAM) have become one of the research hotspots in Free-Space Optical (FSO) communication. The OAM state is a kind of photon angular momentum, which is related to the spatial distribution of the wave function. Different from photon spin angular momentum (Spin Angular Momentum, SAM), for a single photon, OAM can theoretically obtain infinitely many valued characteristic states, and different OAM states are orthogonal to each other. The OAM state multiplexing sy...

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Application Information

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IPC IPC(8): H04B7/06H04B7/08H04B10/114H04B10/116H04L27/26
CPCH04B10/116H04B7/0697H04B7/08H04B10/1143H04L27/2626H04L27/2647
Inventor 邹丽张士兵邵蔚季云云
Owner NANTONG UNIVERSITY
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