Research On High Frequency Multiplication MM-Wave Generation Technique By Polarization Modulation

With the increasing demand for ultra-high speed and large bandwidth signal transmission in modern wireless communication systems,the radio over fiber(Ro F)technology has emerged.Millimeter-wave(mm-wave)in optical domain is one of the key technologies for Ro F.The technology to generate mm-wave based on polarization modulators(PolM)have the advantages of simple structure and stable performance,and it has become a hot topic of optical-generated technology of mm-wave at home and abroad recently.In this paper,our main work on how to generate high frequency mm-wave based on PolMs are as follows.(1)Two schemes based on paralleled PolMs are designed to generate frequency 16-tupling mm-wave.The ±8n-order sidebands expressions are derived,and the optical sideband suppression ratio(OSSR)and radio frequency spurious suppression ratio(RFSSR)of the generated signals are calculated.The simulation systems are constructed by photonic simulation software,the feasibility of which are verified,and the stability of the system is analyzed.(2)Two schemes based on cascaded PolMs and carrier suppression structure are designed to generate frequency 32-tupling mm-wave.The output signal expressions in these schemes are derived theoretically,and the OSSR and RFSSR values are calculated.The simulation systems are built using photonic simulation software,and the feasibility of schemes are experimentally verified.The effects of the phase deviation of the driving signal,modulation index deviation,optical beam splitter ratio deviation,optical attenuator attenuation value deviation and optical amplifier noise on the quality of the generated mm-wave are also analyzed.(3)A scheme based on cascaded dual-polarization modulator(DP-PolM)to generate mmwave with tunable frequency multiplication factor(FMF)is designed.The expression of the output signal is derived theoretically,and the values of OSSR and RFSSR are calculated.The simulation system is built using photonic simulation software,and the feasibility of the scheme is experimentally verified.The effects of the electric phase shifter deviation,modulation index deviation,polarization controller azimuth deviation and polarizer deviation on the quality of the generated mm-wave are also analyzed.The optical generation high-frequency mm-wave techniques designed in this paper have important application prospects in mm-wave and terahertz wave technologies.