Beamforming device and method for radio-over-optical communication based on arrayed waveguide grating

Abstract

An arrayed waveguide grating-based optical wireless communication beamforming device and method thereof. The radio frequency signal is modulated onto multiple wavelength carriers, and processed by a programmable optical true delay module in the optical domain. This module is composed of an optical switch and multiple cascaded AWGs that can provide different basic delays between adjacent wavelength channels. Different levels The basic delay amount of the AWG is in a proportional distribution with a common ratio of 2. Optical carriers of different wavelengths enter different branches for photoelectric conversion to recover radio frequency signals with different delays (phases), realizing the far-field beam directional radiation mode. The invention has the characteristics of broadband, adjustable, flexible, small volume and easy integration, etc., and has very important applications in dynamic scenes such as next-generation mobile communication and high-speed railway.

Description

Technical field [0001] The invention relates to an optical carrier wireless communication system, in particular to a beamforming system and a method based on the true time delay of photons. Background technique [0002] The beamforming technology realizes the spatial focusing of the radio frequency signal in a specific direction by controlling the amplitude and phase of each element of the array antenna (beam directional radiation mode), which can effectively reduce signal transmission loss, increase coverage, and reduce energy Interference to the surrounding signal receiving end caused by diffusion. Therefore, beamforming technology has very important applications in radio frequency and microwave fields such as radar and wireless communications. However, the current beamforming technology based on electronic methods is limited by the "electronic bottleneck" and instantaneous bandwidth, and cannot meet the development needs of radar technology and next-generation wireless commun...

AI Technical Summary

Problems solved by technology

[0004] It should be pointed out that the above-mentioned photonic beamforming schemes all have the disadvantages of being too large and not easy to integrate, while the optical true delay device based on the arrayed waveguide grating (AWG) with multiple input and multiple output ports is small in size and easy to integrate. The advantages of integration have received extensive attention (Z.Cao, Q.Ma, A.B.Smolders, Y.Jiao, M.J.Wale, C.W.Oh, H.Wu, and A.M.J.Koonen, "Advanced integration techniques on broadband millimeter-wavebeam steering for 5G wireless networks and beyond,"IEEE Journal of Quantum Electronics,vol.52,no.1,article:0600620,Jan.2016)

In addition, the above scheme also has the problem that the delay difference between different channels is not easy to adjust; and in dynamic scenarios such as high-speed rail, the radiation direction of the radio frequency signal needs to be dynamically changed according to the movement of the train, so the lack of flexibility will greatly limit the photon beam. The scope of application of the shaping scheme

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