Orbital angular momentum multiplexing channel conversion and data exchange method and device

Abstract

The invention provides an orbital angular momentum multiplexing channel conversion and data exchange method and device. The method comprises the steps: inputting an OAM seed light beam and a Gaussian type pump light beam from the two sides of a nonlinear medium respectively, so that the OAM seed light beam and the pump light beam generate a non-collinear SBA effect in the nonlinear medium, and a coherent phonon field with the same topological charge as the OAM seed light beam is excited; enabling the first OAM channel light beam loaded with the first coded data and the second OAM channel light beam loaded with the second coded data to form an OAM multiplexing light beam on one side of the Gaussian pump light beam; and enabling the OAM multiplexing light beam and the OAM seed light beam to collinearly enter into the nonlinear medium and to be subjected to BAPA interaction with the coherent phonon field so as to obtain an OAM channel light beam after channel conversion and data exchange. According to the invention, the data exchange of the OAM state of the two channels to be exchanged is realized through the BAPA process.

Description

technical field [0001] The invention relates to the technical field of data exchange, in particular to a method and device for orbital angular momentum multiplexing channel conversion and data exchange. Background technique [0002] In recent years, with the rapid development of fixed and mobile Internet, the data throughput is increasing day by day, and the relatively lagging communication and Internet bandwidth has become the main bottleneck in the era of big data and cloud. Therefore, there is an urgent need for a technology that can simultaneously improve data capacity density and spectrum utilization. In this context, the mode-division multiplexing technology in which all channels share the same frequency spectrum and space resources has gradually developed. Among them, the orbital angular momentum (OAM) multiplexing technology has recently become a research hotspot in this field due to its infinite dimensional characteristics on the physical layer. , It is expected to...

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Problems solved by technology

The implementation of mode conversion and exchange of OAM mode groups is the basis of the OAM information interaction protocol. In the article "Terabit free-space data transmission employing orbital angularmomentum multiplexing" published by Wang Jian et al. in the 138th issue of "Nature Photonics" in 2012 Linear spatial light modulation technology is used to realize channel conversion and data exchange. This scheme uses spatial light modulator as the channel conversion element, which cannot achieve all-optical channel conversion, which is not conducive to the development of integration.

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