The reporter learned from China University of Science and Technology that Li Yinmei and Huang Kun of the School of Physics of the school have made new progress in the study of optical communication of Orbital Angular Momentum (OAM) in a strong scattering environment. On the basis of overcoming the study of the strong light scattering of biological tissues to achieve the light manipulation of living cells, Li Yinmei's team applied the complex medium light field control technology to OAM optical communication to achieve high-quality optical communication under strong scattering environment. Research results March 6 Published online in the journal Optics and Applications of the Natural Publishing Group.
Optical Orbital Angular Momentum (OAM) is widely used in classical communications and quantum communications. 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.
In this work, the researchers proposed a scattering matrix based information recovery technology, 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 in this study provides an effective technical means for free-space optical communication, optical fiber communication and quantum communication in a scattering environment.
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