Abstract
Diversified deformations on reflection-style optical antennas caused by processing technique and complex outer-space environment in free-space laser communications are modeled by wavelet analysis. Influence due to the deformations on received power is studied by distortion attenuation factor based on the model. Theoretical and numerical analysis shows that distortion attenuation factor increases with shift factor of the model, decreases with dilation factor of the model, and decreases with irregular fluctuations with wavelet coefficient of the model. To the special case that the deformation can be well approximated to a constant, distortion attenuation factor varies periodically with the linear increase of the deformation coefficient. A reference for the requirement on the precision of optical antenna is proposed, and a method to reduce the effect of deformation is recommended. It is hoped that the study can be used in the design of free space laser communication systems.
Highlights
Free space laser communication is a kind of technique which employs laser as the carrier to transmit signals between two terminals
Since intersatellite laser communication system works with the limitation of optical diffraction, communication distance and photoelectric detection, high quality laser beam, and high precision optical terminals are demanded
Wavelet model has been proposed in the paper for diversified deformations on optical antenna in free space laser communications
Summary
Free space laser communication is a kind of technique which employs laser as the carrier to transmit signals between two terminals. With its potential commercial and military applications due to smaller size and weight of the terminal, less power consumption, larger data rate, denser satellite orbit population, and greater immunity to interference which compare to microwave communications, the research of this technique has become a hot spot [1,2,3,4,5,6]. Since intersatellite laser communication system works with the limitation of optical diffraction, communication distance and photoelectric detection, high quality laser beam, and high precision optical terminals are demanded. Slight wave-front distortions can have significant effect on receiving terminal due to small beam divergence and ultralong distance of the communication link [7,8,9]. To deal with the problem, many studies have been focusing on possible solutions to decrease the effect of distortions, such as the optical phased array [10, 11], while others have been researching on the influence of deformations on the system
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