Title :
Generation of A 16-Star/Square quadrature amplitude modulation (QAM) signal in radio over fiber system
Author :
Wu, Yanzhi ; Ye, Tong ; Zhang, Liang
Author_Institution :
State Key Lab of Advanced Optical Communication Systems and Networks, Department of Electronic Engineering, Shanghai Jiao Tong University, 800 Dongchuan Rd, 200240, China
Abstract :
Radio-over-fiber (RoF) system, which is a promising integration solution of wireless and optical systems, has been attracting increasing attention for its significance in providing broadband wireless access with increased capacity and mobility of the access network and reduced cost of the system. 16-Star and 16-Square QAM signals, carrying four information bits by a single symbol, are attractive modulation format in radio over fiber system because of high spectral efficiency and low symbol rate. In this paper, using a quad-parallel Mach-Zehnder modulator followed by a single-drive Mach-Zehnder modulator, we propose a scheme to generate a 16-Star/Square QAM radio frequency (RF)-signal in radio-over-fiber system. The RF carrier is obtained by quintupling the frequency of the employed local oscillator signal, thus our proposal is cost-effective.
Keywords :
Costs; Integrated optics; Local oscillators; Optical fiber networks; Optical modulation; Proposals; Quadrature amplitude modulation; RF signals; Radio frequency; Signal generators; 16-Square QAM; 16-Star QAM; Radio over Fiber; frequency quintupling technique; quad-parallel Mach-Zehnder modulator;
Conference_Titel :
Communications and Photonics Conference and Exhibition (ACP), 2009 Asia
Conference_Location :
Shanghai, China
Print_ISBN :
978-1-55752-877-3
Electronic_ISBN :
978-1-55752-877-3
