[ Instrument Network Instrument Development ] In recent years, Orbital Angular Momentum (OAM) has been widely used in classical communication and quantum communication. Optical orbital angular momentum theoretically provides an infinite number of orthogonal bases, which can be used for information coding. Optical communication based on OAM multiplexing technology can improve communication rate.
However, in wireless optical communication, when the light beam carrying OAM is transmitted in space, it is susceptible to atmospheric turbulence, haze or dust in the air. Multiple scattering of particles seriously degrades the beam quality, resulting in the beam at the receiving end becoming a random speckle. This increases the bit error rate of the communication. Therefore, solving the accurate transmission and recovery of optical information under strong scattering conditions is of great significance for the research and application of optical communication.
Recently, Li Yinmei and Huang Kun of the School of Physics, University of Science and Technology of China have made new progress in the research of OAM optical communication under strong scattering environment. On the basis of overcoming the research on the strong light scattering of biological tissue to achieve the light manipulation of living cells, the special researcher Gong Lei and researcher Huang Kun cooperated with the application of complex medium light field control technology in OAM optical communication to achieve the strong scattering environment. High-quality optical communication, the research results are published online in the Natural Science Group's Light Science & Application magazine under the topic of Optical orbital-angular-momentum-multiplexed data transmission under high scattering.
In this work, the researchers proposed a scattering matrix-assisted retrieval technique, referred to as SMART. Using the SMART platform, the team accurately extracted information from multiple OAM channels from multiple scattered light fields. In the optical transmission experiment, the team used 8 and 24 channels to achieve accurate transmission of grayscale and color maps respectively. The experimental error rate was less than 0.08%, which was 20 times lower than the previous report. The SMART proposed by this research provides an effective technical means for free-space optical communication, optical fiber communication and quantum communication in a scattering environment.
The co-first author of the paper is Gong Lei and Ph.D. student Zhao Qian. The authors of the paper are Li Yinmei, Gong Lei and Huang Kun. The above research was supported by the National Natural Science Foundation of China and the key projects.
(Original title: China University of Science and Technology Progress in Research on OAM Optical Communication in Strong Scattering Environment)
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