Design of Laser Communication Optical System with Off-Axis Common Aperture

Wang Yunqi; Liu Weiqi; Fu Hanyi; Gao Shijie; Wu Jiabin

doi:10.3788/LOP55.010602

Laser & Optoelectronics Progress, Volume. 55, Issue 1, 10602(2018)

Design of Laser Communication Optical System with Off-Axis Common Aperture

Wang Yunqi^1,2、*, Liu Weiqi^1,2, Fu Hanyi², Gao Shijie^1,3, and Wu Jiabin³

¹Department of Postgraduates, Changchun Institute of Optics, Fine Mechanics and Physics, University of Chinese Academy of Sciences, Changchun, Jilin 130033, China

²First Department of Space Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, Jilin 130033, China

³Department of Photoelectric Detection, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, Jilin 130033, China

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Figures & Tables(16)

Fig. 1. Optical diagram of common aperture system

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Fig. 2. Performance analysis diagram of common aperture system. (a) Spot radius; (b) diagram of MTF curve; (c) diagram of wavefront aberration

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Fig. 3. Diagram of signal light transmitting optical structure and performance analysis. (a) 1550 nm transmitting system; (b) spot radius; (c) diagram of wavefront aberration

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Fig. 4. Diagram of bacon light transmitting optical structure and performance analysis. (a) 1550 nm transmitting system; (b) spot radius; (c) diagram of wavefront

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Fig. 5. Diagram of optical receiving structure

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Fig. 6. Performance analysis diagram of signal light receiving system. (a) Diagram of spot radius; (b) diagram of wavefront; (c) diagram of MTF

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Fig. 7. Diagram of bacon light receiving system

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Fig. 8. Performance analysis diagram of tracking and pointing system. (a) Spot diagram; (b) energy concentration curve

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Table 1. Design parameters of transmitting system

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Table 1. Design parameters of transmitting system

Transmitting system of signal light				Transmitting system of beacon light
Wavelength /nm	ObjectNA	Divergence /mrad	Effectiveaperture /mm	Wavelength /nm	Object NA	Divergence /mrad	Effectiveaperture /mm
1550	0.28	±1 (±0.06°)	16	808	0.31	±1 (±0.06°)	16

Table 2. Design parameters of optical antenna
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Table 2. Design parameters of optical antenna
Effective aperture /mm Reduction ratio Divergence for full-field /mrad
160 10∶1 2 (0.12°)

Table 3. Design parameters of signal light receiving system
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Table 3. Design parameters of signal light receiving system
Wavelength /nm Field of view /mrad Imaging NA Effective aperture /mm
1550 ±1 (±0.06°) 0.28 16

Table 4. Design parameters of beacon light receiving system
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Table 4. Design parameters of beacon light receiving system
Wavelength /nm Size of entrancepupil /mm Trackingaccuracy /μrad Reduction ratio Field of view
Coarsetracking /mrad Finetracking /mrad
808 16 2 10∶1 ±1 (±0.06°) ±0.1 (±0.006°)

Table 5. Optical antenna tolerance analysis
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Table 5. Optical antenna tolerance analysis
Displacement Primary mirror Secondary mirror
Decenter X /mm 0.025 0.025
Decenter Y /mm 0.025 0.025
Decenter Z /mm 0.025 0.025
Tilted X /(″) 20 60
Tilted Y /(″) 20 60
Tilted Z /(″) 20 60

Table 6. Transmitting system tolerance analysis
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Table 6. Transmitting system tolerance analysis
Displacement STO Surface 2 Surface 3 Surface 4 Surface 5 Surface 6
Thickness /mm 0.05 0.05 0.05 0.05 0.05 0.05
Decenter /mm 0.01 0.01 0.01 0.01 0.01 0.01
Tilted / (″) 40 40 40 40 40 40

Table 7. Signal light receiving system tolerance analysis
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Table 7. Signal light receiving system tolerance analysis
Displacement STO Surface 2 Surface 3 Surface 4 Surface 5 Surface 6
Thickness /mm 0.05 0.05 0.05 0.05 0.05 0.05
Decenter /mm 0.02 0.02 0.02 0.02 0.02 0.02
Tilted /(″) 40 40 40 40 40 40

Table 8. Tracking and pointing system tolerance analysis
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Table 8. Tracking and pointing system tolerance analysis
Displacement STO Surface 2 Surface 3 Surface 4 Surface 5 Surface 6 Surface 7 Surface 8
Thickness /mm 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02
Decenter /mm 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02
Tilted /(″) 40 40 40 40 40 40 40 40

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Wang Yunqi, Liu Weiqi, Fu Hanyi, Gao Shijie, Wu Jiabin. Design of Laser Communication Optical System with Off-Axis Common Aperture[J]. Laser & Optoelectronics Progress, 2018, 55(1): 10602

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