Methodological approach to assessing the influence of ionizing radiation on the efficiency of functioning of free­space optical communication

DOI: 10.31673/2412-9070.2022.060913

Abstract

The methodological approach to the assessment of the influence of ionizing radiation on the efficiency of functioning of free-space optical communication, taking into account technogenically loaded territories of Ukraine, is considered. It is indicated that the efficiency of functioning of free-space optical communication (FSO) should be methodologically examined through the influence of external factors using an integrated approach taking into account the concept of uranium heritage in Ukraine and Europe. It is proved that the protection of FSO transceivers from gamma radiation will be determined by the attenuating ability of their design elements and the direction of the radiant flux vector. The conclusions that it is possible to reduce the level of ionizing radiation impact on the FSO receiver by selecting a receiver with the required value of integral sensitivity, as well as by reducing the bandwidth, are confirmed. The dependence of the average energy of gamma radiation on the angle of incidence at the observation point is established. It is pointed out that the influence of ionizing radiation leads to a decrease in the signal-to-noise ratio and effective sensitivity of the receiver. In some cases, ionizing radiation can cause communication interruptions due to receiver saturation. In addition to the useful signal, the receiver lens also collects some unwanted background radiation, which may consist of direct sunlight, reflected sunlight or scattered sunlight from hydrometeors or other objects. Their effect can be reduced by using a narrow spectral bandwidth and spatial filtering before photodetection. However, minor background noise can enter the spatial and frequency ranges of the detector, which can limit system performance by causing a variable offset in the converted electrical signal.

Keywords: radiation; detecting ability; transceiver; factors; free-space optical communication.

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