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The features of designing onboard fiber-optics synchronetwork


A.A. Emelyanov – Design Engineer , JSC «Kaluga Scientific Research Radio Engineering Institute»
M.E. Belkin – Dr. Sc. (Eng.), Moscow Technological University (MIREA)
N.V. Toporkov – Ph. D. (Eng.), Head of Department, JSC «Kaluga Scientific Research Radio Engineering Institute»
V.A. Masnoy – Ph. D. (Eng.), Main Specialist, JSC «CRET»

Modern trends in the development of on-board radio-electronic equipment are mainly associated with integrating the functions of the key radio electronic complexes and with direct digital processing of analogue radio-frequency signals of UHF and microwave bands. The natural consequence of this process is the problem of precise mutual synchronization for the digital and computing apparatuses located inside the aircraft, which means the need to move to the centralized principle of designing onboard synchro-network, where all peripheral equipment is controlled from a single clock generator. This tendency raises the problem of highly stable distribution for harmonic clock signals of UHF and microwave bands with a phase error at the synchronization input of receiving devices, for example, analog-digital converters in the region of units of degrees. Comparison for coaxial and fiber optic cables as an optimal propagation medium shows that even with a line length of several meters, the latter has advantages in terms of lower insertion loss, significantly better weight and size characteristics, insensitivity to electromagnetic interference, better temperature and vibration characteristics. When designing analogue fiber-optic lines, it is required to define a number of important quality parameters that characterize their operation, both in the small-signal mode (transmission and noise factors) and in the large-signal mode (signal-to-noise ratio, harmonic and intermodulation distortions, dynamic range). Following this in the paper we highlighted the circuitry design principles and key dissemination characteristics (transmission coefficient, noise factor, related intensity noise, spurious free dynamic range, and third-order intercept point) of a short-length fiber-optic analog transmission line as a requisite of this network. Investigating the known publications, we collected and analyzed the classification, normalized data and formulas for calculating signal distortions, primarily long-term and short-term phase distortions, which are a subject of fiber-optic link’s delay, length, temperature, vibration, chromatic dispersion, polarization mode noise, cross-talks, and so on. The tested data can be useful for the design of a specific fiber-optic synchronization system.

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