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ALT'23 The 30th International Conference on Advanced Laser Technologies
LS-P-14
Simulation of the operation of a phased radio antenna array using the Fourier transform in the visible wavelength range
V.S. Solovjev, S.P. Timoshenkov, A.S. Timoshenkov
Institute of Nano- and Microsystem Technology Moscow Institute of Electronic Technology
Previously, the idea of transferring the radio frequency to the visible region using Mach- Zehnder modulators was put forward. Such an interferometer makes it possible to modulate coherent laser light with a high-frequency microwave signal. If each antenna element of a phased antenna array is used as a modulating element of a coherent laser beam, previously divided by an optical splitter into a number of channels equal to the number of phased antenna array elements, then further processing can be performed in the visible range of the electromagnetic wave. In this work, experimental modeling of the optical part of the idea of converting a radar signal into an optical spectrum is carried out. Using the inverse Fourier transform procedure, the amplitude image of the aircraft was converted into its pure phase function. The phase distribution of image elements with a dimension of 100 * 200 was sent via a USB line to a space-time light modulator. As a result, a model of the phase distribution of light was obtained, simulating the phase distribution in the Phased Antenna Array (PAR) of the radio range. With the help of the direct Fourier transform (the lens standing after the PVMS), the image of the aircraft was restored. Target coordinates can also be restored. A 532 nm laser was used. It is shown that the use of the optical Fourier transform method makes it possible to increase the noise immunity of the received signal. It is proposed to use the method of converting radio-frequency signals of a phased antenna array into the visible optical range for direct observation of objects in the visible range. It is shown that when using Mach- Zehnder modulators and developing a photonic microcircuit, the optical Fourier transform rate can be of the order of one period of the carrier frequency.
