Millimeter-Wave Radio Over Fiber Optical Upconversion Techniques Relying on Link Nonlinearity
Millimeter-Wave Radio Over Fiber Optical Upconversion Techniques Relying on Link Nonlinearity
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DOI：
10.1109/comst.2015.2409154
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发表时间：
2016-01
影响因子：
35.6
通讯作者：
V. Thomas;M. El-Hajjar;L. Hanzo
中科院分区：
文献类型：
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作者：
V. Thomas;M. El-Hajjar;L. Hanzo
对用于光纤无线电(ROF)的先进上转换技术进行了研究。随着无线通信用户数量和每个客户所需带宽的大幅增加，迁移到更高的频率，即从较低的无线电频率迁移到毫米波载波，是一个必不可少的解决方案。然而，由于毫米波的传播距离较短，需要大量的无线电接入点来提供可靠的覆盖，这将增加基础设施成本。因此，在中心(或控制)点和无线接入点(或远程天线单元)之间使用光纤传输RF信号是为未来高带宽无线通信系统提出的主要接入网解决方案之一。在本文中，我们介绍了ROF通信的基础知识，包括光调制、光信道和光检测技术。然后，我们概述了利用ROF链路的非线性的高级光学上转换技术家族。具体地说，我们描述了如何利用马赫-曾德尔调制器的非线性、波长转换技术或光电探测器的非线性来实现光学上转换。波长转换技术依赖于光纤、光学放大器或电吸收调制器中存在的非线性。
A study of advanced upconversion techniques used in radio over fiber (ROF) is provided. With the huge increase in both the number of wireless communication subscribers and the bandwidth required per customer, migrating to higher frequencies, i.e., from lower radio frequency to millimeter-wave carriers, is an essential solution. However, due to the short propagation range of millimeter waves, a large number of radio access points are required for providing reliable coverage, which would increase the infrastructure costs. Hence, the transmission of RF signals between the central (or control) points and radio access points (or remote antenna units) using optical fibers is one of the major access network solutions that have been proposed for future high-bandwidth wireless communication systems. In this paper, we introduce the basics of ROF communication, including optical modulation, the optical channel, and the optical detection techniques. Then we survey the family of advanced optical upconversion techniques that exploit the nonlinearity of the ROF link. Specifically, we describe how optical upconversion can be achieved by exploiting the Mach-Zehnder modulator's nonlinearity, wavelength conversion techniques, or the photodetector's nonlinearity. The wavelength conversion techniques rely on the nonlinearities present in the fiber, in the optical amplifier, or in the electroabsorption modulator.