Radio-over-fibre beamforming device based on array waveguide grating (AWG) and method thereof

Abstract

The invention relates to a radio-over-fibre beamforming device based on an array waveguide grating (AWG) and a method thereof. Radio-frequency signals are modulated onto carriers of multiple wavelengths, and processed by a programmable optical true time delay module in an optical domain; the module is composed of an optical switch and multiple cascade AWGs capable of providing different basic delays between adjacent wavelength channels; the basic delay amounts of different-level AWGs are in geometric distribution by taking 2 as the common ratio; optical carriers different in wavelength enter different branches to perform photoelectric conversion, so that radio-frequency signals different in delay (phase) are recovered; and thus, a far-field beam directional radiation mode is realized. Theradio-over-fibre beamforming device based on the AWG and the method thereof disclosed by the invention have the characteristics of being wide in band, adjustable, flexible, small in volume, easy to integrate and the like, and are very importantly applied in dynamic scenes, such as next generation mobile communication and high-speed railways.

Description

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

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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