With the development of space technology, more and more Fiber optic gyroscope is used in spacecraft and satellite. Due to the existence of space radiation environment, it will cause serious damage to some components in the Fiber optic gyroscope, especially the fiber ring, and have an important impact on the optical power transmission of the fiber ring. In recent years, the research shows that space irradiation has serious damage to optical elements. In this paper, for a 1550 nm Panda optical fiber, the influence of the radiation damage of this kind of optical fiber is obtained by gamma ray and electron source irradiation respectively. The transmission loss of the fiber is up to 17.5 dB/km after 1Mrad (Si) is irradiated by gamma ray, and 53.2 dB/km after 5×1015/cm2 electrons is irradiated by 0.2MeV electron source. Compared with the previous 1310 nm optical fiber irradiation damage, and through the analysis of the mechanism of optical fiber irradiation damage, it is concluded that the impact of 1550 nm optical fiber irradiation damage is greater than that of 1310 nm optical fiber irradiation damage. In addition, for the degradation of 1550 nm optical fiber, the influence of fiber radiation damage on the bias drift and random walk of the whole fiber optic gyroscope system is analyzed. Finally, based on the radiation damage mechanism of optical fiber and the experimental results of radiation damage of optical fiber, some suggestions on the radiation resistance design of optical fiber ring are given.
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.
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