Theoretic and experimental study on mm-wave radio over fiber system based on OFM

Abstract

This paper presents an overview on millimeter wave radio over fiber systems based on millimeter wave generation by optical frequency multiplication (OFM). The disadvantage of original OFM technique is checked and a novel bi-directional mm-RoF system based on new OFM technique using dual-drive MZM as high-order optical side-modes generator is proposed in principle and experimentally verified by a bi-directional mm-RoF system which not only produces 38 GHz information bearing signal in downstream, but also provides 40GHz local reference for down-conversion of upstream signal. Finally the advantage of OFM technique in reducing fading effect of fiber dispersion is theoretically proved.

40-GHz radio over fiber scheme based on optical frequency multiplication with up to 1.4Gbps OFDM wireless signal employing a Mach-Zehnder modulator and no optical filtering

“…In order to realize this system, the first step is to study how to generate millimeter wave. Many photonic methods to generate of millimeter wave have been proposed, such as optical heterodyne of phase-locked two lasers or loop-locked dual-modes of one laser [2][3][4][5], modulation techniques, such as optical carrier suppression double sidebands (OCS) and optical single sideband (OSSB) [6-10], optical up-conversion based on nonlinear photodiode and optical frequency multiplication (OFM) based on heterodyne of high order optical side-modes [11][12][13].…”

“…In order to realize this system, the first step is to study how to generate millimeter wave. Many photonic methods to generate of millimeter wave have been proposed, such as optical heterodyne of phase-locked two lasers or loop-locked dual-modes of one laser [2][3][4][5], modulation techniques, such as optical carrier suppression double sidebands (OCS) and optical single sideband (OSSB) [6-10], optical up-conversion based on nonlinear photodiode and optical frequency multiplication (OFM) based on heterodyne of high order optical side-modes [11][12][13].The principle of OFM is to generate high-order optical harmonics in an electrical to optical (E/O) converter, such as Mach-Zehnder modulator (MZM), driven by a low radio frequency (RF) sinusoidal signal. When a sinusoidal RF signal drives an E/O converter, many high-order optical harmonics may be generated due to nonlinear response of the E/O converter.…”