光载射频系统中高效频率变换技术研究
发布时间：2018-08-20 16:50
【摘要】：无线通信的可移动性使得用户之间可以随时随地进行通信,而光纤通信的发展很好的解决了无线通信中带宽受限的问题,两者的结合促进了光载射频技术的发展,从未来通信系统的发展方向来看,集无线通信和光纤通信优势为一体的光载射频技术正在得到愈加广泛的应用。基于光学的方法实现的微波信号变频技术带宽大、动态范围高、系统体积重量小,可实现各频段之间一次性的变频,如Ka波段微波信号可通过一个微波光子混频器一次性下变频到中频信号,解决了传统电域变频系统中面临的带宽受限、损耗过大等电子瓶颈,因此成为光载射频系统中的重要研究方向。本文在给出光载射频技术概念的基础上,强调了频率变化技术对于光载射频系统的重要性。然后介绍了光载射频系统的基本原理以及影响链路性能的各个因素,并对微波光子频率变换链路的基本实现方案进行了理论与仿真分析。最后从提高微波光子变频链路性能这一目的出发,针对光纤链路中的功率周期性衰落和非线性失真等问题,实验论证了基于Sagnac环的功率衰落补偿方案和基于直调激光器与DPMZM级联的变频方案。基于Sagnac环的功率衰落补偿方案在对功率进行补偿的同时,能进一步提高链路的动态范围;而基于直调激光器和DPMZM级联的变频方案是以DPMZM和MZM级联的方案的思想为基础,其目的是简化链路结构,节约系统成本。最终结果表明基于直调激光器和DPMZM级联的变频方案在频率变换的同时,也实现了链路的线性优化,明显提高了链路的动态范围。
[Abstract]:The mobility of wireless communication makes it possible for users to communicate anytime and anywhere. The development of optical fiber communication solves the problem of bandwidth limitation in wireless communication. The combination of the two technologies promotes the development of optical radio frequency technology. From the perspective of the future communication system, the optical radio frequency (RF) technology, which integrates the advantages of wireless communication and optical fiber communication, is becoming more and more widely used. The microwave signal frequency conversion technology based on the optical method has large bandwidth, high dynamic range, small system volume and weight, and can realize one-off frequency conversion among different frequency bands. For example, Ka-band microwave signal can be down-converted to intermediate frequency signal by a microwave photonic mixer at one time, which solves the electronic bottleneck of traditional electric domain frequency conversion system, such as limited bandwidth, excessive loss and so on. Therefore, it has become an important research direction in optical RF systems. Based on the concept of optical radio frequency technology, the importance of frequency change technology for optical radio frequency system is emphasized in this paper. Then the basic principle of the optical RF system and the factors affecting the link performance are introduced, and the basic realization scheme of the microwave photonic frequency conversion link is analyzed in theory and simulation. Finally, in order to improve the performance of microwave photonic frequency conversion link, aiming at the power periodic fading and nonlinear distortion in optical fiber link, The scheme of power fading compensation based on Sagnac loop and the scheme of frequency conversion based on the concatenation of direct-modulated laser and DPMZM are demonstrated experimentally. The power fading compensation scheme based on Sagnac loop can further improve the dynamic range of the link while compensating the power, while the frequency conversion scheme based on the direct modulation laser and the DPMZM cascade is based on the idea of DPMZM and MZM cascade scheme. The aim is to simplify the link structure and save the system cost. The results show that the frequency conversion scheme based on the direct-tuning laser and DPMZM cascade achieves the linear optimization of the link, which obviously improves the dynamic range of the link.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.11
本文编号：2194324
[Abstract]:The mobility of wireless communication makes it possible for users to communicate anytime and anywhere. The development of optical fiber communication solves the problem of bandwidth limitation in wireless communication. The combination of the two technologies promotes the development of optical radio frequency technology. From the perspective of the future communication system, the optical radio frequency (RF) technology, which integrates the advantages of wireless communication and optical fiber communication, is becoming more and more widely used. The microwave signal frequency conversion technology based on the optical method has large bandwidth, high dynamic range, small system volume and weight, and can realize one-off frequency conversion among different frequency bands. For example, Ka-band microwave signal can be down-converted to intermediate frequency signal by a microwave photonic mixer at one time, which solves the electronic bottleneck of traditional electric domain frequency conversion system, such as limited bandwidth, excessive loss and so on. Therefore, it has become an important research direction in optical RF systems. Based on the concept of optical radio frequency technology, the importance of frequency change technology for optical radio frequency system is emphasized in this paper. Then the basic principle of the optical RF system and the factors affecting the link performance are introduced, and the basic realization scheme of the microwave photonic frequency conversion link is analyzed in theory and simulation. Finally, in order to improve the performance of microwave photonic frequency conversion link, aiming at the power periodic fading and nonlinear distortion in optical fiber link, The scheme of power fading compensation based on Sagnac loop and the scheme of frequency conversion based on the concatenation of direct-modulated laser and DPMZM are demonstrated experimentally. The power fading compensation scheme based on Sagnac loop can further improve the dynamic range of the link while compensating the power, while the frequency conversion scheme based on the direct modulation laser and the DPMZM cascade is based on the idea of DPMZM and MZM cascade scheme. The aim is to simplify the link structure and save the system cost. The results show that the frequency conversion scheme based on the direct-tuning laser and DPMZM cascade achieves the linear optimization of the link, which obviously improves the dynamic range of the link.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.11
【参考文献】
相关期刊论文 前1条
1 赵尚弘;李勇军;朱子行;赵卫虎;侯睿;楚兴春;;星上微波光子技术应用研究进展[J];空间电子技术;2012年04期
，本文编号：2194324
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