Multi-beam optical phase array for long-range LiDAR and free-space data communication

Wu, Yunhan; Shao, Shuai; Li, Yixuan; Chen, Xiangzheng; Che, Dongbo; Chen, Jiayu; Du, Kui; Jiang, Ruitao; Huang, Xunqing; Kan, Dongping

doi:10.1016/j.optlastec.2022.108027

Cited by 19 publications

(3 citation statements)

References 26 publications

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“…Our target for the far-field beam width is Δθ 3dB = 0.02°. In order to achieve such a narrow beam width while scanning around the center wavelength, the range for the grating attenuation coefficient in the antenna design is limited to between 0.65 mm −1 ∼ 0.75 mm −1 according to equation (1).…”

Section: Structural Optimization Of Swgmentioning

confidence: 99%

“…In recent years, intensive researchs have been conducted in the field of integrated optical phased arrays (OPAs). Applications stemming from OPAs exhibit considerable potential, encompassing areas such as light detection and ranging (LIDAR) systems for autonomous vehicles, free-space optical communications, and biomedical applications [1][2][3][4][5]. Due to the rapid advancement of large-scale integrated silicon photonics technology, the OPAs utilizing silicon photonic integration have emerged as a popular method, with their advantages including lightweight, ultra-compact (owing to the lack of moving parts), and low-cost scanning systems [6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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Subwavelength grating waveguide antenna based on interleaved groove structure

Chen,

Liu,

et al. 2024

Eng. Res. Express

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Integrated optical antennas are essential components of optical phased arrays for applications in light detection and ranging technology. To achieve larger detection distances, wider detection ranges, and higher scanning resolutions, it is imperative to employ millimeter-scale or longer effective lengths to achieve a narrow beam width, coupled with high radiation efficiency. In the high refractive index contrast silicon photonics platform, achieving a narrow far-field beam width and high radiation efficiency simultaneously is a formidable challenge. In the article, a subwavelength grating waveguide antenna with interleaved grooved lateral radiating block arrays is proposed. The simulation result shows that an effective length of about 3.3 mm is attained, with a corresponding far-field beam width is 0.02°, and a radiation efficiency of 0.785 at the wavelength of 1550 nm. It is also found that the crosstalk between the adjacent grating antennas designed in the range of 1.49 μm ~ 1.61 μm is less than -15.6 dB.

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Section: Structural Optimization Of Swgmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Subwavelength grating waveguide antenna based on interleaved groove structure

Chen,

Liu,

et al. 2024

Eng. Res. Express

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“…Atmospheric turbulence changes continuously. Therefore, the WFSless AOS requires a faster correction speed and higher correction quality [11,24,25] . While the SPGD, hill-climbing method, and simulated annealing algorithms necessitate numerous iterations to incrementally achieve optimal correction outcomes, this significantly constrains their correction speed.…”

Section: Introductionmentioning

confidence: 99%

Point source wavefront reconstruction using Swin-UNet in sensorless adaptive optics systems with CCD light intensity images

Zhang,

Zuo,

Cui

et al. 2024

Sixth Conference on Frontiers in Optical Imaging and Technology: Novel Technologies in Optical Systems

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Adaptive optics (AO) systems are trending towards miniaturization and cost reduction, with wavefront sensorless adaptive optics systems (WFSless AOSs) emerging as a field of interest due to their simple structure and application versatility. The advent of deep learning has propelled the use of convolutional neural networks (CNNs) to extract aberration information from CCD images. Nevertheless, CNNs often fail to focus on the regions of images where effective information is concentrated, which limits the accuracy in aberration extraction. This paper introduces a novel Swin-UNet-based model for WFSless AOSs based on point source that employs an attention mechanism to target relevant areas within CCD light intensity images, thus addressing CNN shortcomings. Furthermore, the proposed model fuses in-focus and out-of- focus image information to directly output the reconstructed wavefront image, enhancing the overall wavefront reconstruction process. Our simulations across various D/r0 ratios reveal significant improvements with the Swin-UNet-based model: a reduction in rms wavefront error from 0.0219 to 0.0061 wavelengths at D/r0=1, from 0.0806 to 0.03825 at D/r0=6, and from 0.1241 to 0.0991 at D/r0=11. Correspondingly, the Strehl ratio improved from 0.9950 to 0.9988, from 0.8380 to 0.9567, and from 0.6814 to 0.7522, indicating enhanced image quality post-correction. Compared with existing CNN-based technology, our Swin-UNet approach can more effectively concentrate on the relevant areas of the image and mitigate the influence of invalid regions on the analysis, thereby substantially improving the effectiveness and robustness of the correction performance in WFSless AOSs.

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