Magnification of divergence angle in a ground test of space laser communication

Yuan Hu; Huilin Jiang; Shoufeng Tong; Lizhong Zhang; Dewen Cheng

doi:10.3788/COL201513.S20603

Journals >Chinese Optics Letters >Volume 13 >Issue Suppl. >Page S20603 > Article

Chinese Optics Letters
Vol. 13, Issue Suppl., S20603 (2015)

Magnification of divergence angle in a ground test of space laser communication

Yuan Hu^1、2、*, Huilin Jiang^2、**, Shoufeng Tong², Lizhong Zhang², and Dewen Cheng¹

Author Affiliations

¹Beijing Engineering Research Center of Mixed Reality and Advanced Display, School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China

²National Defence Key Laboratory of Air to Ground Laser Communication, Changchun University of Science and Technology, Changchun 130022, China

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DOI: 10.3788/COL201513.S20603 Cite this Article Set citation alerts

Yuan Hu, Huilin Jiang, Shoufeng Tong, Lizhong Zhang, Dewen Cheng. Magnification of divergence angle in a ground test of space laser communication[J]. Chinese Optics Letters, 2015, 13(Suppl.): S20603 Copy Citation Text

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Abstract

For a long communication distance, the divergence angle of laser transmission by a space laser communication system must be sufficiently narrow to solve the energy problem. However, it needs to be magnified during the ground test before the satellite launches. This way, the two communication terminals can be constantly in the coverage of each other’s laser beam even when the tracking accuracy decreases because of the atmosphere. This Letter presents methods to magnify the divergence angle for laser transmission. The diffraction intensity distributions with different methods and their influence on communication are discussed. We provide the optimal scheme in the ground test of a certain space laser communication. The result represents the accumulated experience for the space laser communication ground test.

E_{i} (ρ^{'}, θ^{'}) = \frac{1}{i λ Z} \exp [i k (Z + \frac{ρ^{' 2}}{2 Z})] \times \iint E_{o} (ρ, θ) e^{- d^{2} / ω^{2}} \exp [- \frac{i k ρ ρ^{'}}{Z} \cos (θ - θ^{'})] ρ d ρ d θ .

(1)

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E_{i} (ρ^{'}, θ^{'}) = \frac{1}{i λ Z} \exp [i k (Z + \frac{ρ^{' 2}}{2 Z})] \times \iint E_{o} (ρ, θ) e^{- d^{2} / ω^{2}} \exp [\frac{i k}{2 Z} ρ^{2}] \exp [- \frac{i k ρ ρ^{'}}{Z} \cos (θ - θ^{'})] ρ d ρ d θ .

(2)

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E_{defocus} (ρ, θ) = E_{o} (ρ, θ) e^{- d^{2} / ω^{2}} \exp [i k (W_{defocus} \frac{ρ^{2}}{D^{2}})] .

(3)

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E_{i} = E (a) - E (b) .

(4)

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η = \frac{{| \iint E_{i} (ρ, θ) E_{i o}^{*} (ρ, θ) ρ d ρ d θ |}^{2}}{\iint E_{i}^{2} (ρ, θ) ρ d ρ d θ \iint E_{i o}^{2} (ρ, θ) ρ d ρ d θ},

(5)

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Yuan Hu, Huilin Jiang, Shoufeng Tong, Lizhong Zhang, Dewen Cheng. Magnification of divergence angle in a ground test of space laser communication[J]. Chinese Optics Letters, 2015, 13(Suppl.): S20603

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