A silicon-based reconfigurable microwave photonic multi-beamforming network chip

Abstract

The invention relates to a silicon-based reconfigurable microwave photonic multi-beam forming network chip, comprising an optical fiber coupler, an optical switch array, an optical splitter, an ultra-wideband continuously adjustable optical true delay line array and a detector array; the optical fiber The coupler is used to input the single-sideband modulated optical signal of the microwave photonic phased array radar, the optical switch array and the optical splitter are used for the reconstruction of the number of array elements used to form the microwave photon multi-beam and the microwave photon single beam, the ultra-wideband A continuously adjustable optical true delay line array is used to independently adjust the delay on each microwave array element, and the detector array is used to output microwave signals. The beneficial effect is that it is used for microwave photonic phased array radar, and realizes large instantaneous bandwidth, high resolution, and reconfigurable microwave photon multi-beam forming.

Description

【Technical field】 [0001] The invention relates to the technical field of integrated microwave photonics, in particular to a silicon-based reconfigurable microwave photonic multi-beam forming network chip. 【Background technique】 [0002] Ordinary phased array radar is a phase-controlled electronically scanned array radar, which uses a large number of individually controlled small antenna units arranged into an antenna array. Each antenna unit is controlled by an independent phase-shifting unit. By controlling the phase of the signal transmitted by each antenna unit , the interference pattern of the signals transmitted by each antenna unit in space can be changed, so as to control the direction of beam transmission. The electromagnetic waves emitted by each antenna element of the phased array are synthesized into a radar main lobe beam whose emission direction is close to straight through interference, and the inhomogeneity of each antenna element will form side lobes. Phased...

AI Technical Summary

Problems solved by technology

According to different specific applications, the definition of different sub-arrays allows to present up to four spatially multiplexed beams oriented in different directions, limited by the characteristics of discrete devices, its adjustment accuracy is small, and its stability is poor

In terms of integration solutions, in 2021, the research team of Zhejiang University (Opt.Commun., 2021, 489) also adopted the method of dividing sub-arrays to expand the original 2D beamforming scheme to beamforming with multiple beams that can be independently controlled, which is relatively easy to implement However, this solution requires complex connections between multiple chips, and the integration level is low. The maximum number of multi-beam formation and the number of array elements required for single beam formation are fixed, and the back-end also needs to add a microwave power distribution structure. Less flexibility and usability

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