FSUE “VNIIFTRI”, Mendeleevo, Moscow region, Russia
Al’manac of Modern Metrology № 3 (27) 2021, pages 12–25
Annotation. The method of active optoelectronic compensation of phase disturbances of a transmitted reference radio-frequency signal in an optical fiber, which can provide simultaneous transmission of several highly stable radio frequency signals over one line, is represented. The scheme with implemented optical multiplexing and optoelectronic compensation, which provides joint high-precision transmission on two optical carriers in one fiber line of signals with a frequency of 100 MHz from two hydrogen masers, is described. Experimentally shown that with optoelectronic compensation of phase disturbances of a signal transmitted over one channel, compensation is also provided for the second reference frequency signal delivered to the end of the line and transmitted in the same line through another optical channel.
Experimental results of measuring the frequency instability of 100 MHz signals transmitted to the remote end of a 200 km optical line through different optical channels are represented. The prospects of using systems for transmitting reference frequency signals over fiber-optic commu-nication lines with active optoelectronic compensation for solving problems in the field of time and frequency metrology, as well as in telecommunications are considered.
Key words: frequency standards, standard frequency signal transmission over fiber-optic links, wavelength-division multiplexing.
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