【作者】 吴波；

【导师】 于晋龙；

【作者基本信息】 天津大学 ， 通信与信息系统， 2011， 博士

【摘要】 随着微波光子技术的飞速发展,以光电振荡器(OEO)为代表的微波源信号产生技术、以微波光子滤波器为代表的信号处理技术、以光子上变频为代表的光-无线融合技术等相关研究成为热点。本工作在分析了OEO的基本原理上,创造性地构建了基于光纤布拉格光栅(FBG)的双激光器双振荡腔OEO,实验中得到了振荡频率为4.99881998GHz、单边带(SSB)相噪为-113dBc/Hz、边模抑制比(SMSR)大于60dB的微波信号。本工作创造性地利用光纤中的分数TALBOT效应,通过光脉冲重复率加倍的方法,实现微波频率的2倍频、4倍频、5倍频和8倍频技术,通过理论计算、仿真和实验实现了将光纤锁模激光器(MLFL)产生的重复率10GHz、脉宽2.8ps的光脉冲倍频到20GHz、40GHz、50GHz,将重复率5GHz、脉宽3ps的光脉冲8倍频到40GHz。本工作根据半导体光放大器(SOA)中的基于载流子密度动态变化的光-光调制作用相关理论,利用SOA中的交叉增益调制(XGM)和交叉相位调制(XPM)非线性效应实现了将1.25Gb/s基带信号上变频为30GHz毫米波信号;实验分析了SOA偏置电流、两光波长间隔、滤波器偏移量等因素对上变频调制度的影响。本文工作创造性提出基于FP-LD的“无本振光子上变频”技术,应用光信号注入FP-LD中的一周期(P1)振荡效应,实现了NRZ-OOK信号的上变频,产生了最低10GHz、最高30GHz的副载波强度调制(SCM)信号;通过实验还验证了2Gb/s的RZ-OOK信号分别上变频到12GHz、14.28GHz成为SCM信号。本文创造性利用“无本振光子上变频”级联偏振延时干涉仪(PDI)的方法,实现了无本振毫米波信号的产生。根据FP-LD输出的无本振光子上变频信号的正啁啾特性,利用单模光纤实现时域压缩后通过PDI滤波得到副载波二次谐波分量,将原有的微波信号转换为频率加倍的毫米波信号;实验中得到了27.8GHz的SCM信号和31.4GHz毫米波信号。本文创造性利用光注入FP-LD的P1振荡效应,实现了将光的相位信息转换成为副载波的相位信息。实验中1.3Gb/s、2.7Gb/s、2Gb/s的光移相键控(PSK)信号分别转换成为14.3GHz、15.12GHz、16GHz的副载波调相信号;分别将2GHz、3GHz、4GHz、5GHz、10GHz、13GHz的正弦调相信号分别转换成为22GHz、21GHz、24GHz、25GHz、10GHz、13GHz的副载波调频(FM)信号。更多还原

【Abstract】 With the great development of the microwave photonics technology, the microwave source generation, microwave signal processing in fiber-optics and fiber-wireless convergence technology are well focused on. The representatives mentioned above are optoelectronics oscillator (OEO), microwave photonics filter and photonics frequency up-conversion.The basic principle of OEO is analyzed and a dual-loop OEO based on FBG is proposed. The obtained microwave with frequency of 4.99881998GHz is obtained with 60dB SMSR and SSB phase noise of -113dBc/Hz.The frequency doubling, quadrupling, quintupling and octupling of microwave are realized by multiplying repetition frequency of optical pulse based on fractional TALBOT effect in fiber. The theoretical computing, simulation and experiments also works out the frequency multiplication. In the experiments, the self-manufactured chromatic dispersion compensator helps in 20GHz, 40GHz, 50GHz pulse generation from 10GHz pulse with 2.8 ps width, and helps in 40GHz pulse generation from 5GHz pulse with 3 ps width.The opto-opto modulation based on carrier population dynamics in SOA is studied and the cross gain modulation and cross phase modulation are employed to up-converte 1.25Gb/s baseband signal in SOA. The involved factor such as biased current, wavelength interval and center window detuning of opical filter are considered and analyzed.A novel‘photonics frequency up-conversion with RF-local oscillator free’scheme is proposed via optical injection into a FP-LD. According to the period-one oscillation (P1) due to optical injection in FP-LD, the NRZ-OOK signal are up-converted to subcarrier modulation (SCM) signal. SCM signals with the subcarrier frequency ranging from 10GHz to 30GHz are generated and the 12GHz, 14.28GHz SCM signal are produced via 2Gb/s RZ-OOK injecting to FP-LD.According to the positive frequency chirp of SCM signal which is induced by carrier population dynamics in FP-LD, the temporal compressing of subcarrier is achieved by signal transmission in SMF. Furthermore, the second harmonic component of compressed SCM is extracted by a polarization delay interferometer (PDI). Thus the microwave SCM is doubled to millimeter wave signal. The 27.8GHz SCM signal is obtained from 13.9GHz SCM and so does the 31.4GHz millimeter wave signal from 15.7GHz SCM.The phase information of optical is converted to microwave phase information due to P1 oscillation in FP-LD in conditon of optical injection. In experiments, the 1.3Gb/s, 2.7Gb/s and 2Gb/s PSK signals are converted to 14.3 GHz, 15.12GHz and 16GHz SCM signals respectively; a series of sine phase modulated signals at 2GHz, 3GHz, 4GHz, 5GHz, 10GHz and 13GHz are converted to 22GHz, 21GHz, 24GHz, 25GHz, 10GHz and 13GHz subcarrier FM signal.更多还原