基于相位调制的微波光子链路的研究
发布时间：2018-09-07 15:55
【摘要】：随着光电子器件以及微波通信技术的快速发展,形成了光学和电学的交叉学科,即微波光子学。微波光子技术具有带宽高、重量轻、抗电磁干扰以及损耗低等优点,对微波信号的发生、传输和处理等方面都有很大的优势,并且被广泛应用于通信、军事等方面。而微波光子链路是微波光子学的核心技术。本论文分析了微波光子链路的性能参数,为了解决非线性失真带来的性能缺陷,提出了基于相位调制的线性化方案。首先通过理论推导分析了微波光子链路的几个关键的性能参数,即增益、噪声、带宽和非线性失真等。并且从理论的角度分析了外调制技术以及相位调制技术,为本文提供了理论基础。其次,提出了两个将相位调制转换为强度调制的方案,即色散法和滤波法。基于滤波法,将转换技术应用到光下变频技术,此技术主要是利用本地振荡器对光调制信号二次调制的方式将微波信号变频到低频和中频信号,从而方便接收部分对微波信号的解调和处理。最后提出了一个基于相位调制的消除色散影响的大动态范围的微波光子链路,本方案利用相位调制器的两个偏振轴,将调制后的光调制信号分为两路,分别滤波处理,分别将相位调制转换为强度调制,然后将两路信号合并,通过控制两路光载波的输入功率的比例,实现了抑制三阶非线性失真,从而提高动态范围。并且,滤波后的信号为单边带信号,可以消除色散的影响。
[Abstract]:With the rapid development of optoelectronic devices and microwave communication technology, the interdiscipline of optics and electricity, that is microwave photonics, has been formed. Microwave photon technology has many advantages, such as high bandwidth, light weight, anti-electromagnetic interference and low loss. It has great advantages in microwave signal generation, transmission and processing, and has been widely used in communications, military and so on. Microwave photonic link is the core technology of microwave photonics. In this paper, the performance parameters of microwave photonic link are analyzed. In order to solve the performance defect caused by nonlinear distortion, a linearization scheme based on phase modulation is proposed. Firstly, several key performance parameters of microwave photonic link, such as gain, noise, bandwidth and nonlinear distortion, are analyzed theoretically. The external modulation technology and the phase modulation technology are analyzed theoretically, which provides the theoretical basis for this paper. Secondly, two schemes of converting phase modulation into intensity modulation are proposed, namely dispersion method and filtering method. Based on the filtering method, the conversion technique is applied to the optical downconversion technology, which mainly uses the local oscillator to modulate the optical signal twice to convert the microwave signal to the low frequency and intermediate frequency signal. It is convenient for receiving part to demodulate and process microwave signal. Finally, a large dynamic range microwave photonic link based on phase modulation is proposed. Using the two polarization axes of the phase modulator, the modulated optical modulation signal is divided into two channels, which are filtered and processed separately. The phase modulation is converted into intensity modulation, and then the two signals are combined. By controlling the ratio of input power of the two optical carriers, the third-order nonlinear distortion is suppressed and the dynamic range is improved. Moreover, the filtered signal is a single sideband signal, which can eliminate the influence of dispersion.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN015
本文编号：2228713
[Abstract]:With the rapid development of optoelectronic devices and microwave communication technology, the interdiscipline of optics and electricity, that is microwave photonics, has been formed. Microwave photon technology has many advantages, such as high bandwidth, light weight, anti-electromagnetic interference and low loss. It has great advantages in microwave signal generation, transmission and processing, and has been widely used in communications, military and so on. Microwave photonic link is the core technology of microwave photonics. In this paper, the performance parameters of microwave photonic link are analyzed. In order to solve the performance defect caused by nonlinear distortion, a linearization scheme based on phase modulation is proposed. Firstly, several key performance parameters of microwave photonic link, such as gain, noise, bandwidth and nonlinear distortion, are analyzed theoretically. The external modulation technology and the phase modulation technology are analyzed theoretically, which provides the theoretical basis for this paper. Secondly, two schemes of converting phase modulation into intensity modulation are proposed, namely dispersion method and filtering method. Based on the filtering method, the conversion technique is applied to the optical downconversion technology, which mainly uses the local oscillator to modulate the optical signal twice to convert the microwave signal to the low frequency and intermediate frequency signal. It is convenient for receiving part to demodulate and process microwave signal. Finally, a large dynamic range microwave photonic link based on phase modulation is proposed. Using the two polarization axes of the phase modulator, the modulated optical modulation signal is divided into two channels, which are filtered and processed separately. The phase modulation is converted into intensity modulation, and then the two signals are combined. By controlling the ratio of input power of the two optical carriers, the third-order nonlinear distortion is suppressed and the dynamic range is improved. Moreover, the filtered signal is a single sideband signal, which can eliminate the influence of dispersion.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN015
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