Optimum design for optical modulator in coherent optical orthogonal frequency-division multiplexing system

被引：0
|
作者：
Hao Y. [1 ]
Li Y. [1 ]
Wang R. [1 ]
机构：
[1] Institute of Communications Engineering, People's Liberation Army University of Science and Technology, Nanjing
来源：
Zhongguo Jiguang/Chinese Journal of Lasers | 2011年 / 38卷 / 03期
关键词：
Bias control; Coherent optical communications; Optical modulator; Orthogonal frequency division multiplexing;
D O I：
10.3788/CJL201138.0308027
中图分类号：
学科分类号：
摘要：
Coherent optical orthogonal frequency-division multiplexing (COOFDM) is being considered as a promising technology for future optical transmission. In COOFDM systems, optical Mach-Zehnder modulators (MZM) are used to up-convert orthogonal frequency-division multiplexing (OFDM) signal from radio frequency (RF) domain to optical domain. However, OFDM is very sensitive to nonlinearity, so subsequently study of nonlinearity impact from MZM is of great interest. The impact of COOFDM systems introduced by the nonlinearity of MZM is focused on and a numerical simulation to identify system Q-value under various MZM bias points and modulation index is performed. Results show that in contrast to intensity-modulation/direct-detected system (bias point is quadrature point), optimal modulator bias point is zero point and optimal modulation index is 0 dB for COOFDM system.
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