Microwave Photonic Frequency Measurement And Photonic Integration

In the field of modern radar communication,microwave photonics has the advantages of low loss,large bandwidth and strong electromagnetic interference.Compared with traditional electronics,microwave photonics has become a subject that attracts wide attention and develops rapidly.In the development of photonics,photonic integration has become the trend of photonics development in the future because of its excellent performance,such as encapsulation structure,small volume,ultra-low loss and less environmental influence.Microwave frequency measurement,as the primary condition in radar signal processing discrimination,plays an important role in microwave photonics.Researchers have proposed a variety of different frequency measurement schemes according to the different requirements of actual frequency measurement.In this paper,the microwave photon frequency measurement scheme and photon integration will be analyzed.The main research contents are as follows:1.This section introduces the important electrooptic devices and optical devices in microwave photonics.This section also analyzes its basic working principle and relevant important parameters,and deduces the mathematical formulas of several common modulation modes.The principle of dispersion and polarization in microwave photons are introduced in detail.2.This paper proposes a microwave frequency measurement scheme based on Dual-drive Mach-zender Modulator.Dispersion is introduced by using single-mode fiber.The upper and lower paths form power attenuation functions with different trends.By using the amplitude comparison function for one-to-one mapping,we can estimate the instantaneous frequency of the input signal to be measured.This scheme can adjust the frequency measurement range by adjusting the single-mode fiber and the polarization controller..So that the scheme has the extensibility.Photon simulation software VPI is used to verify the feasibility of the system.The frequency measurement range of the system is 1-20 GHz,and the frequency measurement error is less than 0.4GHz.3.This paper proposes a microwave frequency measurement scheme based on cyclic frequency shift.The scheme consists of signal module,cyclic frequency shift module and coherent receiving module.By adjusting the frequency shifter,the radio frequency signals of different frequency ranges can appear in different channels.In this way,the frequency of the measured signal can be estimated.The scheme has the ability to measure multiple frequency points simultaneously,which can satisfy the requirements of the current complex frequency measurement environment.Moreover,balanced photodetectors are used to reduce the demand for large bandwidth of the photodetector.The VPI simulated photon link was used to build the system,which verified the feasibility of the scheme.The frequency measurement range of the system can be as high as 48 GHz.4.In this paper,three kinds of photonic integration materials are analyzed,including indium In P based compound materials,silicon based materials and lithium niobate crystal materials.This section analyzes their respective advantages and disadvantages,and describes their respective application scene.The frequency measurement scheme based on cyclic frequency shift is simulated by photon integration.The photon integration simulation software Opt Sim is used to verify the feasibility of the scheme.