A.A. Bortsov

Theoretical and experimental studying of the low noise laser oscillator (OEO) with system of phase autofine tuning (PAT ) is spent. Article is devoted the decision to an actual problem of radio physics - to creation of the low noise oscillator of the microwave oven of a range with limiting characteristics of spectral density of capacity of phase noise at offset 1- 10 кHz . Theoretical questions of generation RF of fluctuations with low level of phase noise in system the OEO with PAT depending on width of a spectral line of the laser are considered. It is shown that the OEO with system PAT is the radio-frequency oscillator with ultralow level of spectral density of phase noise (level-120 - 140Dbc/Hz on frequency of generation 10 GHz at offset 1-10 кHz ). In article theoretical and experimental studying of the low noise laser oscillator (OEO) with not dispersive and dispersive fiber-optical line of a delay as systems of two oscillators of optical and radio-frequency ranges is spent. The main features the OEO are considered: suppression of phase noise in system fiber optic delay line , influence on phase noise of width of a spectral line of radiation of the laser of a rating, optical capacity of the laser and delay size in fiber optic delay line . Influence of dispersion fiber optic delay line on a spectrum of a radio-frequency signal the OEO is analysed. It is shown that the OEO is the radio-frequency oscillator with system of phase autofine tuning (PAT) with ultralow level of spectral density of phase noise (level - 140Dbc/Hz on frequency of generation 10 GHz at offset 1 кHz).