Tunable microwave pulse signal precise generation method and device by adopting polarization quadrature modulation

Abstract

The invention discloses a tunable microwave pulse signal precise generation method and a tunable microwave pulse signal precise generation device by adopting polarization quadrature modulation. After a single-wavelength continuous light source is processed by a polarization quadrature dual-wavelength light source generation module, two light wavelengths with polarization states in quadrature and certain wavelength difference are output. The two wavelength components with the polarization states in quadrature respectively and simultaneously complete phase modulation for phase reversal on two quadrature polarization axes of a polarization modulator; then different frequency modulation areas of light signals at the two modulated light wavelengths are selected by using an intensity-modulated periodic time domain switch; finally, constant carrier frequency/chirped microwave pulse signals with designated pulse rate, pulse width and center carrier frequency are generated through frequency beating of a photoelectric detector. The tunable microwave pulse signal precise generation method and the tunable microwave pulse signal precise generation device by adopting polarization quadrature modulation have the advantages that on the premise that the generated microwave pulse signals are ensured to have high-frequency advantages and a large time-bandwidth product, the high-precision control and the flexible tuning of the pulse rate, the pulse width and the center carrier frequency of the generated pulse signals are further realized, the optional output of constant carry frequency/frequency chirped microwave pulse signals is also realized and the application scope is very wide.

Description

technical field [0001] The invention relates to microwave photonics and polarization modulation technology, especially the generation technology of photonic microwave pulse signal. Background technique [0002] Microwave pulse signals are widely used in radar systems, optical fiber communications and wireless communications. At present, microwave pulse signals are generally generated by electronic devices, circuits or schemes. However, due to the limitations of electronic bottlenecks, traditional electronics methods for generating microwave signals are difficult to generate high-quality microwave pulse signals with high frequency and large instantaneous bandwidth. In order to solve this problem, a method of generating microwave pulse signals based on photonics came into being. [0003] The method of generating microwave pulse signals based on photonics not only has the advantages of high frequency and low noise, but also can use the characteristics of low fiber loss and an...

AI Technical Summary

Problems solved by technology

First of all, under the premise that the system structure remains unchanged, only one microwave pulse signal of constant carrier frequency or frequency chirp can be generated

Secondly, the wavelength-time domain mapping processing accuracy is not high, which will directly lead to inaccurate parameters of the generated signal (for example, it is difficult to achieve MHz-level accuracy or deviation for the center carrier frequency of the generated signal); thirdly, the multi-dimensional pulse signal Independent, accurate, and fast tuning of parameters is also a big challenge (most operations such as changing the shape of the filter passband, the free spectrum area of ​​​​frequency domain shaping, and the size of the dispersion value are completed by physical actions, and the response speed is relatively lagging)

Images