A microwave frequency measurement method and device based on an optical frequency comb

Abstract

The invention provides a microwave frequency measuring method and device based on an optics frequency comb, and belongs to the microwave frequency measuring method and device technical field; the method comprises the following steps: dividing a laser signal formed by a laser and with the frequency fc into two parts, and using an unknown RF signal with the frequency fRF to carry out carrier suppression double-sideband modulation for one of the said two parts; beating frequencies of a carrier suppression double-sideband modulation signal and an off resonance light frequency comb on a narrowband photoelectric detector; parsing the frequency spectrum of the beat frequency signals, thus obtaining frequency information and power information of the two beat frequency signals; determining the frequency of the incident RF signal according to determined i, f1, f2 and a formula (7). The measuring device comprises the laser, a first coupler, an intensity modulator, a programmable filter, an erbium doped fiber amplifier, a double parallel modulator, a signal-generator, an electricity coupler, a phase shifter, a photoelectric detector, a frequency spectrograph, a second coupler, a third coupler and a fourth coupler.

Description

technical field [0001] The invention relates to a microwave frequency measurement method and device based on an optical frequency comb, and belongs to the technical field of microwave frequency measurement methods and devices. Background technique [0002] At present, a major problem in the field of photonics microwave frequency measurement is how to measure the frequency of microwave signals with high precision in a large frequency measurement range. The commonly used microwave power mapping method can generally perform frequency measurement within the frequency range of 20GHz, but it can only measure the frequency of single-frequency signals, and the measurement accuracy is not uniform; the frequency measurement of the channel method can be realized in a larger range. Frequency measurement, however, its measurement accuracy is only on the order of GHz; the scanning method can measure high-precision frequency of multi-frequency microwave signals in a wide range, but its rea...

AI Technical Summary

Problems solved by technology

The commonly used microwave power mapping method can generally perform frequency measurement within the frequency range of 20GHz, but it can only measure the frequency of single-frequency signals, and the measurement accuracy is not uniform; the frequency measurement of the channel method can be realized in a larger range. Frequency measurement, but its measurement accuracy is only on the order of GHz; the scanning method can measure high-precision frequency of multi-frequency microwave signals in a wide range, but its real-time performance is poor, and instantaneous frequency measurement cannot be performed

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