Linear frequency-modulated signal microwave photon frequency multiplication method and device

Abstract

The invention provides a linear frequency-modulated signal microwave photon frequency multiplication method and device. Under a large signal modulation mode, two parallel Mach-Zehnder modulators which are connected in parallel are utilized to generate high-order nonlinear optical sidebands; direct current bias phase positions and modulation coefficients of the two modulators are adjusted, so that in the optical sidebands output by the two modulators, required optical sidebands are the same in phase and stray optical sidebands are opposite in phase; polarization of the optical sidebands output by the two modulators are orthogonally coupled, and a polarization detection angle of an analyzer is adjusted, so that the stray optical sidebands is equal are power and completely counteracted, thereby obtaining the required optical sidebands; and linear frequency-modulated signals of eightfold frequency and twelvefold frequency are generated through frequency beating by detector, in the scheme, suppression of stray sidebands does not need optical filtering processing or any electrical phase shift processing, tuning performance of a system is good, and the linear frequency-modulated signal microwave photon frequency multiplication method and device are suitable for frequency multiplication processing of arbitrary waveform signals such as single-frequency microwave millimeter wave signals, linear frequency-modulated signals and nonlinear chirp signals, and have very broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of microwave photon signal processing, and in particular relates to a microwave photon frequency doubling method and device for a linear frequency modulation signal. Background technique [0002] Chirp signal is one of the most commonly used radar signal forms. It has a large time-width bandwidth product, which can improve the measurement accuracy and resolution of radar distance and speed at the same time. On the other hand, chirp signal has excellent pulse compression Features, can improve the range and measurement accuracy of the radar at the same time. With the continuous development of technology, the requirements for the accuracy and resolution of radar equipment are getting higher and higher. Especially in the field of military combat, it is urgent to improve the ability of radar to accurately detect, locate, and image. Therefore, the chirp signal needs to have a wider bandwidth. . The generation of...

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Problems solved by technology

[0005]However, the above solution has certain limitations

In the schemes 1) and 2), the frequency multiplication factor only reaches 4. To generate an ultra-wideband chirp signal, the input signal needs to have a wide bandwidth, so the dependence on the input circuit is high, and the advantages of microwave photon frequency multiplication are not fully utilized.

On the other hand, in view of the characteristics of the wide spectrum of the chirp signal, the non-linear sidebands of each order may overlap, and the spurious sidebands cannot be suppressed by filtering, and the electric phase shifter cannot perform any precise phase shift on the wideband signal. Therefore, the microwave photon frequency multiplication system for linear frequency modulation signals should try to avoid the use of optical filtering and electrical phase shift processing, which also limits the improvement of its frequency multiplication coefficient

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