No 7 (2024)

From 2 to 5 September 2024 the annual international regional symposium on electromagnetic compatibility EMC Europe 2024 was held at the Congress and Convention Centre of the VMCC in Bruges (Belgium). The participation of scientists from the EAEU countries in the significant scientific event was noted.

At the XXIX SATCOMRUS 2024 Conference held in early October in Yaroslavl and organised by Russian Satellite Communications Company, large-scale plans to upgrade the Russian state constellation of communication and broadcasting satellites in geostationary orbit until 2030 were announced. The new spacecraft will be built at domestic factories.

The characteristics of multimode telecommunication optical fibers of categories OM1-OM5, which have found wide application in the world as a part of structured cable systems, data centres, local networks as a cost-effective transmission medium, are considered. Special attention is paid to optical and transmission characteristics, standardisation issues, necessity of correct understanding of characteristics and terms related to the capacity of multimode fibers, including short transmission distances in the order of hundreds of metres.

The current state, ways and perspectives of optoelectronic technologies development for transport fiberoptic communication systems, image and signal processing, quantum communications and computing are considered.

The choice of modulation type for radio systems intended for operation in absence of strict limitations to the occupied frequency range is considered. For such systems the use of multi-position frequency shift keying (M-FSK), which has high energy efficiency and low value of the radiated signal peak factor is proposed. An analysis of the fundamental features of M-FSK manipulation, which has high energy efficiency, is presented. The results of modelling of transmission channel noise immunity for different values of modulation index and multiplicity, as well as the corresponding spectral characteristics are presented. Recommendations on improving of systems with M-FSK are developed.

This series of papers presents international industry standards for 400G open line interfaces with interchangeable coherent optical transceiver modules (transceivers) for OTN/DWDM transport fiber optic transmission systems (Part 1), evolution of generations of coherent digital signal processors (DSPs) for high-speed optical channels (wavelengths) in FOTS (Part 2), and evolution of technologies for manufacturing coherent DSPs for FOTS (Part 3).