Title :
Photonic Generation of M-QAM/M-ASK Signals at Microwave/Millimeter-Wave Band Using Dual-Drive Mach–Zehnder Modulators With Unequal Amplitudes
Author :
Zhang, Ye ; Xu, Kun ; Zhu, Ran ; Li, Jianqiang ; Wu, Jian ; Hong, Xiaobin ; Lin, Jintong
Author_Institution :
Key Lab. of Opt. Commun. & Lightwave Technol., Beijing Univ. of Posts & Telecommun., Beijing
Abstract :
Based on photonic vector modulation (PVM) techniques, several novel schemes are proposed to generate 4-ary amplitude shift keying (4-ASK), 16-ary quadrature amplitude modulation (16-QAM), and 16-ary amplitude shift keying (16-ASK) signals at microwave/millimeter-wave (mm-wave) band. First, a 4-ASK signal generation architecture based on dual-drive Mach-Zehnder modulators (MZMs) with unequal amplitudes is proposed and experimentally demonstrated. Then by combining two 4-ASK signal generation schemes in parallel, PVM architectures for 16-QAM and 16-ASK signal generation are proposed employing three MZMs, a tunable optical delay line (ODL), and an optical attenuator. The detailed theoretical analysis, experiment, and simulation certification of these structures are carried out. Compared with the conventional methods, the electronic driven circuits in the proposed schemes are simplified by employing PVM techniques.
Keywords :
amplitude shift keying; microwave photonics; optical communication equipment; optical delay lines; optical fibre networks; quadrature amplitude modulation; radio-over-fibre; vectors; 16-ary amplitude shift keying; 16-ary quadrature amplitude modulation; 4-ary amplitude shift keying; M-ASK signal generation; M-QAM signal generation; dual-drive Mach-Zehnder modulator; electronic driven circuits; optical attenuator; photonic generation; photonic vector modulation; radio-over-fiber; tunable optical delay line; Amplitude modulation; Amplitude shift keying; Microwave generation; Microwave theory and techniques; Millimeter wave technology; Optical attenuators; Optical modulation; Quadrature amplitude modulation; Signal generators; Tunable circuits and devices; Amplitude shift keying (ASK); Mach–Zehnder modulator (MZM); photonic vector modulation (PVM); quadrature amplitude modulation (QAM); radio-over-fiber (RoF);
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2008.927597
