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Optics Communications

Optical encryption by dynamically modulating the spatial frequency of light fields

Haoyang Yu, Min Ouyang, Xin Zhang, Tianhua Feng, Zhaohui Li

Published Mar 14, 2024• 5 citations
Publisher
DOI
10.1016/j.optcom.2024.130459

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Abstract We propose and study a new technique for securing fibre data communication. The paper presents a method for optical encryption of information transmitted with a traditional fibre link. The encryption method uses a spatial light modulator which converts light pulses representing original data into pseudo-random patterns. A linear combination of light pulses with pseudo-random patterns provides a required encryption performance. The main element of the encryptor is the spatial light modulator which comprises a matrix of cells selectively transmitting or blocking the light beam depending on the pseudo-random configuration of cells. The encrypted information is transmitted through the optical fibre. The decryption process relies on a computational solving of linear program or greedy pursuit. We present a brief description of the method, theoretical analysis and results of numerical simulation. A physical model concept of the method is also presented.
An optical field will undergo coherent diffusion when it is mapped into thermal-motioned atoms, e.g., in a slow or storage light process. As has been demonstrated before, such a diffusion effect is equivalent to a spatial low-pass filter attenuating the high-spatial-frequency (SF) components of the optical field. Here, employing electromagnetically induced transparency (EIT)-based light storage in hot atomic vapor, we demonstrate that the angular deviation between the control and the probe beams could be utilized as a degree of freedom to modulate the SF of the probe beam. The principle is to change the diffusion-induced low-pass filter into a bandpass filter, whose SF response can be tuned by varying the direction and magnitude of the angular deviation. Transverse multimode light fields, such as optical images and Laguerre-Gaussian modes, are utilized to study such SF modulation. Our findings could be broadly applied to the fields of quantum information processing, all-optical image manipulation, and imaging through diffusive media.