Two-dimensional optical phased array with grating lobe suppression by element distribution and emitting amplitude optimization

Daocheng Zhang; Fangzheng Zhang; Shilong Pan

doi:10.1117/12.2518294

14 February 2019 Two-dimensional optical phased array with grating lobe suppression by element distribution and emitting amplitude optimization

Daocheng Zhang, Fangzheng Zhang, Shilong Pan

Author Affiliations +

Proceedings Volume 11048, 17th International Conference on Optical Communications and Networks (ICOCN2018); 1104807 (2019) https://doi.org/10.1117/12.2518294
Event: 17th International Conference on Optical Communications and Networks (ICOCN2018), 2018, Zhuhai, China

Abstract

A grating-lobe-suppressed two-dimensional (2D) optical phased array (OPA) is proposed to realize optical beam steering based on unequally-spaced technique, in which the element distribution is optimized by a modified genetic algorithm to achieve a minimum peak side-lobe level (PSLL). Numerical simulations of 2D unequally-spaced OPAs are carried out. The results show that by optimizing the element distribution in an unequally-spaced OPA using the modified genetic algorithm, the grating lobes and side lobes can be well suppressed. Specifically, the PSLL of the far-field pattern reaches as low as 0.20 in 0° beam direction for a 2D 10×10 OPA with the inter-element spacing between 1 μm and 3 μm, which is much better than the traditional unequally-spaced OPA. The relationship between the optimized PSLL and the practical fabrication accuracy is also investigated. The results indicate that the proposed OPA can allow a certain fabrication deviation. Besides, the additional amplitude weighting method is applied to the optimized 2D unequally-spaced OPAs, and the simulation results show that the optimized unequally-spaced OPAs with amplitude weighting can achieve a better grating-lobe suppression. For the 2D 10×10 OPA, the PSLL can be further reduced to 0.18 in 0° beam direction. The proposed 2D low grating-lobe OPAs are expected to benefit many practical applications such as light detection and ranging, high-resolution display, and free-space optical communications.

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Daocheng Zhang, Fangzheng Zhang, and Shilong Pan "Two-dimensional optical phased array with grating lobe suppression by element distribution and emitting amplitude optimization", Proc. SPIE 11048, 17th International Conference on Optical Communications and Networks (ICOCN2018), 1104807 (14 February 2019); https://doi.org/10.1117/12.2518294

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KEYWORDS

Phased array optics

Genetic algorithms

Beam steering

Free space optics

LIDAR

Optical components

Free space optical communications

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