KEYWORDS: Telecommunications, Avalanche photodetectors, Silicon, Laser communications, Interference (communication), Lithium, Laser systems engineering, Gallium arsenide, Eye, Signal to noise ratio
Based on the radiation test of APD, the change of parameters is analyzed, and the degradation rule of performance after radiation damage is mastered. A typical IM/DD optical communication system is established. The BER and signal eye chart of the system under different dark currents and responses are obtained. The influence of APD performance parameters degradation on communication quality is further analyzed. The result shows that the increase of the dark current and the decrease of the responsivity of APD will cause the BER of the system increase. With the decrease of the responsivity, the influence of the dark current on the BER will decrease gradually, and the variation amplitude is nearly 5 orders of magnitude. With the increase of the dark current, the influence of the responsivity on the BER will change about 3 orders of magnitude. Compared with the increase of dark current, the BER is more sensitive to the decrease of responsivity.
The image sensor in satellite optical communication system may generate noise due to space irradiation damage, leading to deviation for the determination of the light spot centroid. Based on the irradiation test data of CMOS devices, simulated defect spots in different sizes have been used for calculating the centroid deviation value by grey-level centroid algorithm. The impact on tracking & pointing accuracy of the system has been analyzed. The results show that both the amount and the position of irradiation-induced defect pixels contribute to spot centroid deviation. And the larger spot has less deviation. At last, considering the space radiation damage, suggestions are made for the constraints of spot size selection.
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