A.R. Bestugin1, A.A. Pogorelov2, S.V. Dvornikov3, S.S. Dvornikov4, I.A. Kirshina5

1, 3-5 Saint-Petersburg State University of Aerospace Instrumentation (St. Petersburg, Russia)

2-4 Military Academy of Communications n.a. Marshal of the Soviet Union S.M. Budyonny (St. Petersburg, Russia)

1 fresguap@mail.ru; 2 anpog@yandex.ru; 3 practicdsv@yandex.ru; 4 dvornic92@mail.ru; 5 ikirshina@mail.ru

In optical receivers for realisation of procedures of heterodyning of a signal, both at a stage of formation, and at reception, as a rule, diodes are used. At the same time diodes, being electronic devices, are characterised by internal noises, which limit the sensitivity of reception. The nature of internal noise of electronic devices is determined by thermal processes and shot effect, which in their turn are determined not only by the ambient background temperature, but also by the frequency of received radiations.

To present the results of estimation of the threshold sensitivity of diode mixers in heterodyning paths of optical receivers.

Results are presented on the development of an approach to sensitivity estimation of heterodyne receiver mixer estimation. Estimation expressions for calculating the internal noise level of an optical mixer are obtained. The approach of shot noise estimation characterising the threshold sensitivity from the position of noise temperature is proposed. Simplified expressions of dependence of threshold sensitivity as a function of radiation frequency at a given temperature are obtained. Noise values in terms of temperature for different frequencies are calculated. A practical method of measuring the noise temperature, which characterises the sensitivity of reception, based on measuring the output voltage when receiving signals from sources with known temperatures of emitters, is substantiated. The values of the signal-to-noise ratio of the threshold sensitivity for different frequency ranges are presented.

The obtained analytical expressions allow us to conclude that the rational solution is the choice of the frequency range in the region of 0.1…1 THz, because it is characterised by a relatively low noise temperature, but at the same time it is able to provide a high speed of message transmission.

Bestugin A.R., Pogorelov A.A., Dvornikov S.V., Dvornikov S.S., Kirshina I.A. Sensitivity evaluation of optical receiver mixers. Radiotekhnika. 2024. V. 88. № 6. P. 170−177. DOI: https://doi.org/10.18127/j00338486-202406-20 (In Russian)

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