FIBER-OPTIC INSTANTANEOUS FREQUENCY MEASURING SYSTEM OF MULTIPLE MICROWAVE SIGNALS Russian patent published in 2020 - IPC G01R23/165 

FIELD: optics.

SUBSTANCE: fibre-optic device relates to the technique of optical-electronic measurements, in particular to devices for measuring instantaneous frequencies of microwave signals using optical filters. Fibre-optical device for measuring instantaneous frequencies of multiple microwave signals comprises a source of a narrow-band optical signal, a first Mach-Zehnder modulator, where the radio frequency input of the first Mach-Zehnder modulator is input of a fibre-optic system for measuring instantaneous frequencies of multiple microwave signals, an optical circulator, an optical filter, a first photodetector, a second photodetector, as well as a controller for determining microwave frequency signals. Second port of the optical circulator through the optical filter through the fibre-optic guides through the first photodetector is connected to the first input of the microwave signal frequency determining controller, and the third port of the optical circulator is connected to the second input of the microwave signal frequency determining controller by a fibre-optic guide through the second photodetector. System also includes a microwave signal generator, a second Mach-Zehnder modulator, where the optical input of the second Mach-Zehnder modulator is connected to the narrow-band optical signal source by means of the fibre-optic guide, the radio-frequency input of the second Mach-Zehnder modulator is connected to the microwave signal generator, and the output of the second Mach-Zehnder modulator by means of the fibre-optic guide is connected to the optical input of the first Mach-Zehnder modulator, in its turn, the output of which is connected to the first port of the optical circulator by means of a fibre-optic guide. Microwave signal frequency determining controller has an output which is an output of a fibre-optic system for measuring instantaneous frequencies of a plurality of microwave signals.

EFFECT: invention enables to measure frequencies of several microwave signals simultaneously.

5 cl, 3 dwg