Microwave Photonic Vector Signal Generation And Channelization

Vector signal generation technology based on microwave photonics has obvious advantages over traditional electronic systems and can meet people's requirements for Demand for high bandwidth and high speed.Channelization reception generally refers to channelization in the frequency domain.It divides broadband signals in the frequency domain into multiple narrowband signals for processing in order to achieve the purpose of processing large bandwidth signals indirectly.Due to the inherent large bandwidth,low loss,and other characteristics of microwave photons,the channelization receiving technology based on microwave photons can well solve the problems of electrical analog channelization receivers and digital channelization receivers.The main work is as follows:1.A cascaded vector signal generation scheme based on Sagnac loop for DDMZM and MZM is proposed.This scheme uses DDMZM to modulate I and Q baseband waveforms and cascades one MZM to convert baseband data to the optical domain.Generated a doubled vector signal.The simulation results show that the scheme has good tuning performance in the frequency range of 10-40 GHz and generates vector signals with good performance.2.A vector signal generation scheme based on the cascade of DP-BPSK and MZM is proposed and simulated.This scheme makes up for the instability of Sagnac loop in the first scheme.One polarization state of DP-BPSK is used to modulate I and Q baseband signals,and the other polarization state is used to modulate local oscillator on MZM.The simulation results show that the scheme has good tuning performance in the frequency range of 10-40 GHz and generates vector signals with good performance.3.A four channel receiving scheme based on microwave photons is proposed and simulated.The scheme cleverly uses DPMZM to shift the frequency of optical carrier,then modulates the broadband signal,and uses image suppression technology to realize demodulation of four channels with two local oscillators.In the simulation,the scheme successfully downconverts 9.5GHz-13.5GHz broadband signal to 0.5ghz-1.5GHz of different channels,and its spurious rejection ratio and isolation between channels are 39 db.The scheme has simple structure and good simulation results.4.A scheme of tunable microwave photon channelized reception based on the local frequency shift is proposed and simulated.When the scheme generates the local frequency,it uses DPMZM to shift the local frequency and ingeniously designs the signal to demodulate four channels.Because the scheme has its own expandable advantages,the expansion scheme of the scheme is introduced later.Several receiving modules and frequency shift are connected in parallel Module,which can demodulate N channels.In the simulation,we successfully downconvert the broadband signal from 10GHz-14 GHz to 0.5GHz-1.5GHz of different channels,with the spurious rejection ratio of 38 d B and the isolation between channels of 35 d B.The advantages of the scheme are simple structure,parallel connection,multi-channel demodulation and good scalability.