Article

Article title SELF-PHASE MODULATION BASED CHIRP GENERATION
Authors Yu.V. Zachinyaev
Section SECTION II. RADIO ENGINEERING, TELECOMMUNICATIONS
Month, Year 08, 2015 @en
Index UDC 621.373.9
DOI
Abstract The present work is aimed at the research and analysis of the approach to solving the problem of increasing the frequency deviation of the linear frequency modulated signals. According to the literature and patent documents analysis the relevance of the research field and the necessity of the further research for better use of linear frequency modulated signals in areas such as radiolocation, access control, secure communications were confirmed. The structure of the linear frequency modulated signals generator based on the phase self-modulation effect has been provided. Generator includes optical units forming the master pulse, fiber-optic delay line transforming a Gaussian optical pulse signal into the chirp signal, optical receiver module and frequency conversion components. The operation principle of such device, analytical expressions to get the basic parameters of the generated signals – chirp central frequency and frequency deviation – were considered. Simulation of the chirp generator proving the efficiency of the devise was performed – the shape of the frequency spectrum corresponds with the spectrum of the default chirp, and the autocorrelation sidelobes don’t exceed minus 13,4 dB level. It has been shown that the proposed technical solution allows to substantially increase the value of frequency deviation as compared to currently existing analogues. The boundary value of frequency deviation of modern approaches to the chirp generating does not exceed 1–10 GHz. Chirp generator based on self-phase modulation effect provides a frequency deviation of the order of 30–40 GHz with a pulse width of 100 ps and is limited by the parameters of the element base, in particular, optical receiver modules.

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Keywords Linear frequency modulated signals; phase self-modulation effect; ultra wideband signal generation.
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