A Two-Dimensional Optical Phased Array Grating Lobe Elimination and Phase Modulation Method

Abstract

The invention relates to a grating lobe elimination and phase modulation method for a two-dimensional optical phased array. The method solves the problems of an existing two-dimensional optical phasedarray that the deflection angle is not large enough and the distinguishability is not high enough, and comprises the following steps that 1), uniform spacing of a one-dimensional antenna array is optimized into one-dimensional non-uniform array spacing through a phase weighting method; 2), the array spacing obtained in step 1) is applied to a two-dimensional array, a modulated phase is added to array emergent light through a conversion algorithm, and phases of all arrays are modulated simultaneously; 3) the obtained array spacing is applied to the manufacturing of an on-chip two-dimensional optical phased array, and an obtained phase difference is used for an electronic speed controller to obtain a low-grating-lobe optical phased array.

Description

technical field [0001] The invention relates to the field of optical phased arrays, in particular to a two-dimensional optical phased array grating lobe elimination and phase modulation method. On-chip two-dimensional optical phased array element arrangement and phase modulation technology. Background technique [0002] Phased array is an array composed of phase-controlled array elements, which can achieve beam steering by adjusting the phase of the outgoing wave of each array element. Accuracy and stability have been greatly improved. Optical phased arrays work in the optical frequency band and can be used for point-to-point free-space optical communication, light detection and measurement, holographic imaging, and generation of vortex light, etc., and have important application prospects in smart mobile devices that require high power consumption and volume. [0003] At present, the most commonly used optical phased array technology is realized through micro-nano integra...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing on-chip two-dimensional optical phased array deflection angle is not large enough and the resolution is not high enough, and to provide a two-dimensional optical phased array grating lobe elimination and phase modulation method. The method of eliminating the grating lobe and narrowing the main lobe under the premise that the integration degree of the array element cannot be greatly improved, and the distance between the array elements is relatively large relative to the optical wavelength, and at the same time, the phase of each array element can be reasonably modulated

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