A method and device for generating broadband frequency-modulated microwave signals based on photonics

Abstract

The invention discloses a broadband frequency modulation microwave signal generation method based on photonics. The method comprises the following steps: performing optical M-order and optical second-order single sideband modulation on two paths of homologous single-frequency optical carriers by using a microwave local oscillator signal and a baseband / low-frequency electric frequency modulation signal respectively; realizing the cancellation of the optical carrier component by superposing the optical M-order and optical second-order single sideband modulation signals; and converting the superposed optical signal into an electric signal to obtain a broadband microwave signal of which the bandwidth is twice of the frequency modulation range of the baseband / low-frequency electric signal and the central frequency is M times of the frequency of the microwave local oscillator signal. The invention further discloses a broadband microwave signal generation device based on photonics. Frequencymultiplication and up-conversion of baseband / low-frequency electric signals are realized by utilizing a photon technology, and high-frequency-band, large-bandwidth and waveform-reconfigurable frequency-modulated microwave signals can be generated at a relatively low digital-to-analog conversion rate.

Description

technical field [0001] The invention relates to a method for generating a broadband microwave signal, in particular to a method and device for generating a broadband frequency-modulated microwave signal based on photonics. Background technique [0002] With the growth of various military and civilian needs, broadband signals are playing an increasingly important role in systems such as radar and electronic warfare. Because the root mean square error of distance measurement and the minimum resolvable distance are inversely proportional to the signal bandwidth, the high-precision and high-resolution measurement of the target distance requires the radar to transmit a signal with a large bandwidth. At the same time, because the energy of the broadband signal is dispersed in a larger bandwidth, when the signal bandwidth increases, the power spectral density of the transmitted signal required to maintain a certain operating distance or coverage can be proportionally reduced, which...

AI Technical Summary

Problems solved by technology

However, direct cascading of such photonic-based mixers and frequency multipliers will result in repeated electro-optical and photoelectric conversions, which can severely impact system performance

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