FIELD: measuring technology.
SUBSTANCE: invention relates to the field of measuring technology and concerns a device for measuring the optical signal propagation delay in a medium. The device includes two femtosecond infrared lasers, a Michelson interferometer with a known reference arm and a measuring arm: the measured line, a photodetector receiving a signal from the measured line, and a recorder. Both lasers are ultra-wideband, differ in the pulse repetition period and are installed with the possibility of alternately connecting to the device circuit through two sequentially connected fiber gates, providing the formation of an acting signal for passing through the fiber line under test. A high-frequency photodetector is used as a photodetector, and a broadband oscilloscope with software that makes it possible to carry out correlation analysis of two groups of values is used as a recorder.
EFFECT: increase in the accuracy of measuring the propagation delay of an optical signal in long fiber lines.
1 cl, 1 dwg
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