Adaptive optics technology and urban horizontal link laser communication system

Zhang, Ming; Jiang, Lun; Huang, Zhen

doi:10.1117/1.oe.60.11.116107

Cited by 3 publications

(3 citation statements)

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“…Zhong ZQ et al proposed a laser beam using a self-rotating wavefront to eliminate the degradation caused by turbulence and obtain a lower peakto-valley (PV) [11]. Among them, the introduction of AO technology further improved the mixing efficiency at the receiver side of the system, becoming an effective method to suppress the atmospheric turbulence effect [12][13][14]. The AO system corrected by the Zernike mode method can effectively compensate for the wavefront distortion effect caused by atmospheric turbulence on the reception sensitivity of the optical wireless coherent communication system [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Effect of Wavefront Distortion on the Performance of Coherent Detection Systems: Theoretical Analysis and Experimental Research

Yang

Xing

et al. 2023

Photonics

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Atmospheric turbulence causes signal beam wavefront distortion at the receiving end of a coherent detection system, which decreases the system mixing efficiency. Based on the coherent detection theory, this study establishes a mathematical model of wavefront distortion with mixing efficiency and mixing gain. It also analyzes the improvement limits of wavefront correction on mixing efficiency and mixing gain under different atmospheric turbulence intensities and experimentally measures them. Simulation results show that the mixing efficiency can be improved to 51%, 55%, and 60% after correcting for tilt, defocus, and astigmatism terms, respectively, when turbulence intensity D/r0 is 2. The mixing gain with homodyne detection is 3 dB higher than heterodyne detection. Meanwhile, the wavefront correction orders required for optimal mixing efficiency are higher than the heterodyne correction order. In the experiment, Haso4 NIR + DM 40 was used, and the turbulence intensity D/r0 was 2. After the closed-loop control algorithm corrects the tilt, defocus, and astigmatism terms, the indoor experimental results showed that the mixing efficiency is improved to 36%, 47%, and 62%, respectively. The outdoor experimental results showed that the mixing efficiency improved to 36%, 51%, and 68%, respectively.

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Section: Introductionmentioning

confidence: 99%

Effect of Wavefront Distortion on the Performance of Coherent Detection Systems: Theoretical Analysis and Experimental Research

Yang

Xing

et al. 2023

Photonics

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“…With the progress and development of laser technology, lasers have been widely used in communication, military, industrial, and biomedical fields. [1][2][3][4][5][6][7][8] Lasers in the 561 nm band are frequently used in fluorescence spectroscopy, Raman spectroscopy, photoacoustic spectroscopy, and absorption spectroscopy. [9][10][11][12][13] In addition, lasers in this band can also be used as ideal light sources for biomedical or microscopic imaging instruments such as flow cytometers and confocal microscopy.…”

Section: Introductionmentioning

confidence: 99%

“…With the progress and development of laser technology, lasers have been widely used in communication, military, industrial, and biomedical fields 1–8 . Lasers in the 561 nm band are frequently used in fluorescence spectroscopy, Raman spectroscopy, photoacoustic spectroscopy, and absorption spectroscopy 9–13 .…”

Section: Introductionmentioning

confidence: 99%

The single‐wavelength 561 nm laser based on reflective volume Bragg grating

Chang

Yao

et al. 2022

Micro & Optical Tech Letters

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This article presents 561 nm single-wavelength laser by laser diode endpumped Nd:YAG crystal. The reflective volume Bragg grating is used as the output coupling mirror to effectively select the center wavelength of 1123 nm. The single wavelength laser output at 561 nm is obtained by intracavity frequency doubling via LBO crystal cut in accordance with Type I phase matching condition. When the pump power is 4 W, the output power reaches 229.6 mW, and the power instability is less than 3% within 5 min. Experiments show that the reflective volume Bragg grating acts as both a frequency selection element and an output coupling mirror, which simplifies the resonator structure and improves the laser output power.

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