Study On Photonic Generation Of W-band Millimeter Wave Technology In RoF System

With the rapid development of network technology,big data,cloud computing and other information technologies are constantly proposed.The realization of these technologies cannot be achieved without massive data interaction,which requires the communication network to have the characteristics of large capacity,high rate and low delay.Extending spectrum resources can achieve the goal of large capacity and high rate communication.There are abundant available spectrum resources in the millimeter-wave band(30GHz-300GHz),and rational development and utilization can solve the dilemma of the current spectrum resource shortage.This thesis focuses on the development and utilization of millimeter wave,focusing on the generation of W-band(75-110GHz)millimeter wave.(1)Firstly,the research background and significance of millimeter wave are described in this thesis.W-band works in the atmospheric window,and will play a promising role in 6G technology extending to air and space communication in the future.Based on the perfection of optical fiber infrastructure in China,the application of RoF technology combining optical fiber transmission and wireless access in millimeter wave communication can solve the problem of small coverage of millimeter wave,and the generation of millimeter wave is one of the important research contents of RoF technology.Then,introduces the RoF system,and introduces its composition and advantages and disadvantages in detail.Then the optical millimeter-wave technology is introduced and the four main optical millimeter-wave technologies are described in detail and their respective advantages and disadvantages are summarized.(2)In this thesis,a 30 octave optical millimeter-wave system based on triangle wave and HNLF is proposed.The system uses 3GHz RF signal to generate 90 GHz optical millimeter-wave signal.The proposed system innovatively takes advantage of the triangular wave which is easy to generate high octave harmonics and combines with the four wave mixing effect of HNLF to generate 30 octave millimeter waves.The simulation results show that the system scheme is feasible,and the system simulation results show that there is an optimal length of HNLF and the signal light intensity of the input HNLF to achieve the best FWM effect in the HNLF.(3)This thesis also studies how to use a single modulator to generate multi-radio frequency millimeter wave signals,and proposes a multi-radio frequency optical millimeter wave system based on DPMZM.The system uses DPMZM to polarized multiplexing two optical signals modulated by 15 GHz and 16 GHz RF signals respectively,and transmits them through one optical fiber.Then,combining with the FWM effect of HNLF,the third order sideband is generated.After filtering the frequency beat,the six times frequency millimeter wave signal can be obtained.The simulation results show that the system can successfully generate 90 GHz and 96 GHz optical millimeter wave signals,and the eye map of the receiving end is good after 10 km transmission,and the dispersion compensation fiber can ensure the normal signal reception after 20 km transmission.