N.A. Davletkildeev1, A.O. Nikiforova2, E.Yu. Mosur3, S.V. Krivaltsevich4

1 Omsk Scientific Center SB RAS (Omsk, Russia)

2 Institute of Radiophysics and Physical Electronics of Omsk Scientific Center SB RAS (Omsk, Russia)

3 Omsk Scientific-Research Institute of Instrument Engineering (Omsk, Russia)

The growing interest in the transmission of signals over fiber-optic transmission system (FOTS) is associated with the advantages of optical fiber compared to coaxial cable for the transmission of radio frequency (RF) signals in applications with a remote antenna from control and information processing centers, as well as for signal transmission inside objects. The advantages of FOTS have the greatest effect on the transmission of signals in communication systems operating in the microwave range, since the main problem in transmitting a signal over a coaxial cable is power loss, which increases with distance and signal frequency. There are practically no data in the literature on the use of FOTS for the transmission of signals in the HF-VHF bands. Manufacturers indicate the possibility of operation of FOTS components in the HF-VHF frequency ranges, however, the characteristics given by them mainly refer to the UHF and microwave ranges. The purpose of this work is to compare the main parameters characterizing the efficiency of signal transmission over an analog fiber optic line built on the basis of a transmitting module with direct modulation of optical radiation.

The first part contains a description of the experimental setup and methods for determining the FOTS parameters: gain; the level of non-linear distortion of the signal, the blocking dynamic range, the spurious free dynamic range.

The second part shows the frequency dependences of the gain and blocking dynamic range in the frequency range from 3 MHz to 3 GHz over an analog FOTS built on the basis of a transmitting module with direct modulation of optical radiation. The dependence of the relative power of the harmonic components on the power of the input signal at different frequencies and the results of determining the spurious free dynamic range are given. The obtained results of the main characteristics of FOCL are of practical relevance in the design of radio communication complexes operating in the HF-UHF range.

1. Refai Hakki H., Sluss James J.Jr., Refai Hazem H. Atiquzzaman Mohammed Comparative study of the performance of analog fiber optic links versus free-space optical links. Society of Photo-Optical Instrumentation Engineers. 2006. V. 45. № 2. P. 025003-1-025003-10.
2. Shcherbakov V.V., Solodkov A.F., Zadernovskii A.A. Peredacha signalov modulyatsii intensivnosti sveta v analogovykh volokonno-opticheskikh liniyakh svyazi. Radioelektronika. 2016. T. 8. № 1. S. 9−24. (in Russian)
3. Babani S., Bature A.A., Faruk M.I., Dankadai N.K. Comparative study between fiber optic and copper in communication link. International Journal of Technical Research and Applications. 2014. V. 2. № 2. P. 59−63.
4. Speranskii V.S., Abramov S.V., Klintsov O.I., Shuvalov V.M. Osobennosti analogovoi i tsifrovoi peredachi radiosignalov po voloknu// T-Comm: Telekommunikatsii i transport. 2016. T. 10. № 9. S. 38−42. (in Russian)
5. Vysokochastotnyi lazernyi modul DMPO131-21. DMPO155-21. http://www.dilas.ru/pom/dmpo131&155-21.php (data obrashcheniya 20.07.2022). (in Russian)
6. Shirokopolosnyi mikrovolnovyi InGaAs PIN-fotopriemnik DFDMSh70-06. http://www.dilas.ru/prom/dfdmsh70-06.php (data obrashcheniya 20.07.2022). (in Russian)
7. Kompaktnye opticheskie priemniki i peredatchiki (do 6,5 GGts). https://sphotonics.ru/catalog/kompaktnye-moduli-svch-priemnikov-i-peredatchikov-dlya-3-i-6-ggts-signalov/ (data obrashcheniya 20.07.2022). (in Russian)
8. Moduli dlya peredachi RCh i sputnikovykh signalov po voloknu. https://sphotonics.ru/catalog/opticheskie-linii-peredachi-sputnikovykh-signalov-l-diapazona/ (data obrashcheniya 20.07.2022). (in Russian)
9. Ivanov S.I., Lavrov A.P., Saenko I.I. Application possibilities of fiber-optic telecommunication links’ components for beamforming systems of broadband antenna arrays. 24th Int. Crimean Conference «Microwave & Telecommunication Technology». 2014. P. 479−480.
10. Ivanov S.I., Lavrov A.P., Saenko I.I. Kharakteristiki sverkhshirokopolosnykh radiofotonnykh linii peredachi SVCh signalov. Elektronika i mikroelektronika SVCh. 2015. T. 2. S. 294−298. (in Russian)
11. Ivanov S.I., Lavrov A.P., Saenko I.I., Ivanov D.V., Odnoblyudov M.A., Tsaruk A.A. Issledovanie kharakteristik modulei peredatchikov s vnutrennei i vneshnei modulyatsiei v analogovykh volokonno-opticheskikh liniyakh peredachi SVCh radiosignalov. Elektronika i mikroelektronika SVCh. 2016. T. 2. S. 69−73. (in Russian)
12. Davletkildeev N.A., Nikiforova A.O., Mosur E.Yu., Krivaltsevich S.V. Issledovanie kharakteristik analogovoi volokonno-opticheskoi linii peredachi radiosignalov v VCh-, OVCh-diapazone. Tekhnika radiosvyazi. 2022. Vypusk 1 (52). S. 51−61. (in Russian)