Research of Optical and APT Technology in One-Point to Multi-Point Simultaneous Space Laser Communication System

Huilin, 姜会林 Jiang; Lun, 江伦 Jiang; Yansong, 宋延嵩 Song; Lixin, 孟立新 Meng; Qiang, 付强 Fu; Yuan, 胡源 Hu; Lizhong, 张立中 Zhang; Xiaonan, 于笑楠 Yu

doi:10.3788/cjl201542.0405008

Cited by 9 publications

(1 citation statement)

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“…Hence, this technology is suitable for rectifying wavefront aberrations in free-space laser communication systems operating amidst strong turbulence conditions [3,4]. In a free-space optical communication system, when the selected signal wavelength has poor penetration or severe attenuation in the atmospheric channel, the system employs beacon light with a wavelength different from signal light, in conjunction with the Acquisition, Pointing, and Tracking (APT) system, to achieve capture, aiming, and tracking, thereby establishing the communication link [5,6]. However, because of the different wavelengths of signal light and beacon light, atmospheric dispersion and beam diffraction effects may lead to differences in wavefront phase aberrations after atmospheric turbulence transmission [7,8].…”

Section: Introductionmentioning

confidence: 99%

Study on the Difference in Wavefront Distortion on Beams Caused by Wavelength Differences in the Strong Turbulence Region

Han,

Ke,

Liang

2024

Applied Sciences

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In free-space optical communication, the transmission of signal light and beacon light of differing wavelengths through the same atmospheric channel encounters variations in how the atmospheric refractive index absorbs and scatters light. This leads to distinct degrees of wavefront aberrations between the signal and beacon lights. In this study, we employed statistical optics to derive wavefront phase structure functions for both signal and beacon lights under conditions of strong turbulence. We explored how wavefront distortion varies among beams of different wavelengths after propagation through such turbulent conditions. Our findings revealed that as the turbulence outer scale escalates, the difference in wavefront distortion between signal and beacon lights stabilizes after an initial increase, assuming constant wavelengths. Furthermore, we observed significant changes in the relative wavefront aberrations when the inner scale of turbulence surpasses the separation between two points on the receiving apertures. As the disparity in wavelength decreases, so does the difference in wavefront aberrations. Finally, we propose a method for correcting wavefront aberrations based on coefficients of Zernike polynomials corresponding to beams with different wavelengths. This approach is validated through simulation and experimentation, demonstrating an 11% enhancement in the signal-to-optical Strehl ratio and a 0.072 increase in spot energy after the addition of correction coefficients compared with before their inclusion. These results solidify the efficacy of our method in improving adaptive optics correction accuracy.

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