scholarly journals Silicon Ribbon-Based Dual-Beam Optical Phased Array with Low Crosstalk and Large FoV

2022 ◽  
Vol 12 (1) ◽  
pp. 505
Author(s):  
Hsun-Yuan Chi ◽  
Wei Hong ◽  
Hsuan Lai ◽  
Shih-Hsiang Hsu ◽  
Che-Chang Chang
Keyword(s):  
Phased Array ◽  
Vertical Direction ◽  
Side Lobe ◽  
Field Of View ◽  
Full Width ◽  
Half Maximum ◽  
Dual Beam ◽  
Silicon Ribbon ◽  
Chirped Grating ◽  
Optical Phased Array

In this paper, a silicon ribbon (SR)-based microstructure is developed and added to a 32-channel optical phased array (OPA) to reduce the crosstalk between the antennas of grating waveguides. The spacing between the chirped grating antennas can be as close as 600 nm to effectively improve the field of view (FoV) of the OPA in the horizontal direction to 95 degrees. This SR-based approach substantially reduces the side lobe by 10 dB, effectively suppressing the noise and increasing the main lobe by 6 dB and considerably expanding the grating length with linear energy decay. The full width at the half maximum of the light spot reaches about 0.24 degrees. The antenna sites can simultaneously be scanned vertically by bi-directional inputs, effectively increasing the FoV to 30 degrees in the vertical direction.

scholarly journals A Design Approach of Optical Phased Array with Low Side Lobe Level and Wide Angle Steering Range

Photonics ◽  
2021 ◽  
Vol 8 (3) ◽  
pp. 63
Author(s):  
Xinyu He ◽  
Tao Dong ◽  
Jingwen He ◽  
Yue Xu
Keyword(s):  
Phased Array ◽  
Phase Distribution ◽  
Beam Steering ◽  
Side Lobe ◽  
Design Approach ◽  
Optical Antennas ◽  
Side Lobe Level ◽  
Wide Angle ◽  
Spacing Distribution ◽  
Optical Phased Array

In this paper, a new design approach of optical phased array (OPA) with low side lobe level (SLL) and wide angle steering range is proposed. This approach consists of two steps. Firstly, a nonuniform antenna array is designed by optimizing the antenna spacing distribution with particle swarm optimization (PSO). Secondly, on the basis of the optimized antenna spacing distribution, PSO is further used to optimize the phase distribution of the optical antennas when the beam steers for realizing lower SLL. Based on the approach we mentioned, we design a nonuniform OPA which has 1024 optical antennas to achieve the steering range of ±60°. When the beam steering angle is 0°, 20°, 30°, 45° and 60°, the SLL obtained by optimizing phase distribution is −21.35, −18.79, −17.91, −18.46 and −18.51 dB, respectively. This kind of OPA with low SLL and wide angle steering range has broad application prospects in laser communication and lidar system.

scholarly journals Galactic Background Radiation in the 78 to 111 EV Band

1990 ◽  
Vol 139 ◽  
pp. 241-242
Author(s):  
W. T. Sanders ◽  
J. J. Bloch ◽  
B. C. Edwards ◽  
K. Jahoda ◽  
M. Juda ◽  
...  
Keyword(s):  
Proportional Counter ◽  
Count Rate ◽  
Background Radiation ◽  
Field Of View ◽  
Sounding Rocket ◽  
Full Width ◽  
Half Maximum ◽  
Maximum Field ◽  
Galactic Background

Galactic background radiation has been observed in the 78-111 eV Be band using 5000 Å beryllium filters in front of a thin-window proportional counter collimated to a 15° full width at half maximum field of view. Be band data have been analyzed from two sounding rocket flights (Bloch et al. 1986, Juda 1988) that viewed seventeen different directions distributed over the northern galactic hemisphere. In Figure 1 the pointing directions of the two flights are indicated on a map from McCammon et al. (1983) of the 130-188 eV B band count rate.

Silicon Optical Phased Array with Grating Lobe-Free Beam Formation Over 180 Degree Field of View

2018 ◽  
Author(s):  
Christopher T. Phare ◽  
Min Chul Shin ◽  
Jahnavi Sharma ◽  
Sohail Ahasan ◽  
Harish Krishnaswamy ◽  
...  
Keyword(s):  
Phased Array ◽  
Field Of View ◽  
Grating Lobe ◽  
Beam Formation ◽  
Optical Phased Array ◽  
Free Beam

scholarly journals Wide-Angle Beam-Steering Using an Optical Phased Array with Non-Uniform-Width Waveguide Radiators

Photonics ◽  
2020 ◽  
Vol 7 (3) ◽  
pp. 56
Author(s):  
Youngin Kim ◽  
Hyeonho Yoon ◽  
Jong-Bum You ◽  
Minchul Kim ◽  
Hyo-Hoon Park
Keyword(s):  
Phased Array ◽  
Beam Steering ◽  
Side Lobe ◽  
Phase Shifters ◽  
Wide Angle ◽  
Half Wavelength ◽  
Electro Optic ◽  
Optical Phased Array ◽  
Diffraction Patterns ◽  
Silicon Based

We demonstrate wide-angle beam-steering using an optical phased array (OPA) with waveguide radiators designed with non-uniform widths to reduce the crosstalk between waveguides. The OPA consists of a silicon based 1 × 16 array of electro-optic phase shifters and end-fire radiators. The 16 radiators were configured with four different widths and a half-wavelength spacing, which can remove the higher-order diffraction patterns in free space. The waveguides showed a low crosstalk of −10.2 dB at a wavelength of 1540 nm. With phase control, the OPA achieved wide beam-steering of over ±80° with a side-lobe suppression of 7.4 dB.

Dual beam deflection of liquid crystal optical phased array

2012 ◽  
Vol 10 (s2) ◽  
pp. S20502-320506
Author(s):  
Fei Pan Fei Pan ◽  
Lingjiang Kong Lingjiang Kong ◽  
Xiaobo Yang Xiaobo Yang ◽  
Yue Ai Yue Ai ◽  
Yan Zhou Yan Zhou
Keyword(s):  
Liquid Crystal ◽  
Phased Array ◽  
Beam Deflection ◽  
Dual Beam ◽  
Optical Phased Array

High speed and low side lobe optical phased array steering by phase correction technique

2013 ◽  
Author(s):  
Yadong Jin ◽  
Aimin Yan ◽  
Zhijuan Hu ◽  
Zhenyu Zhao ◽  
Wangzhou Shi
Keyword(s):  
High Speed ◽  
Phased Array ◽  
Side Lobe ◽  
Phase Correction ◽  
Correction Technique ◽  
Optical Phased Array

System Design Of A Wavefront Sensing Package For A Wide Field Of View Optical Phased Array

1988 ◽  
Vol 27 (9) ◽  
Author(s):  
John D. Gonglewski ◽  
Christooher R. De Hainaut ◽  
Curt M. Lampkin ◽  
Raymond C. Dymale
Keyword(s):  
System Design ◽  
Phased Array ◽  
Field Of View ◽  
Wavefront Sensing ◽  
Wide Field ◽  
Wide Field Of View ◽  
Optical Phased Array

Low Side Lobe On-chip Two Dimensional Optical Phased Array Based on the Hill Climbing Algorithm

2018 ◽  
Vol 47 (9) ◽  
pp. 913001
Author(s):  
杜书剑 DU Shu-jian ◽  
章羚璇 ZHANG Ling-xuan ◽  
王国玺 WANG Guo-xi ◽  
李中宇 LI Zhong-yu ◽  
张其浩 ZHANG Qi-hao ◽  
...  
Keyword(s):  
Phased Array ◽  
Side Lobe ◽  
Hill Climbing ◽  
Two Dimensional ◽  
Hill Climbing Algorithm ◽  
Optical Phased Array ◽  
On Chip ◽  
The Hill
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