基于单个光调制器产生多路无线和有线信号

Generation of Multiple Path Wireless and Wireline Signals Based on a Single Optical Modulator

提出了一种采用单个光调制器生成多路无线和有线信号的系统方案,并成功实现了两路5 Gbaud四相相移键控(QPSK)无线信号和一路5 Gb/s二进制振幅开关键控(OOK)基带信号在80 km单模光纤(SMF)中的有效传输。利用双极化马赫-曾德尔调制器(DP-MZM)、功率耦合器、光滤波器等器件,实现了经济高效、结构简单的多路无线、有线双重服务,减小了信号间干扰、光纤色散走离效应等因素的影响,避免了传输距离的限制,提高了系统的可靠性。实验结果表明,5 Gb/s OOK基带有线信号经80 km SMF传输后的功率代价仅为1 dB,承载5 Gbaud QPSK的15 GHz和30 GHz信号经80 km SMF传输后的功率代价分别为2 dB和4 dB。

In this study, we used a single optical modulator to generate multiple path wireless and wired signals. We successfully transmitted two channels of 5 Gbaud quadrature phase-shift keying (QPSK) wireless signal and one channel of 5 Gb/s binary amplitude on-off keying (OOK) baseband signal over 80-km single-mode fiber (SMF). By employing dual-polarization Mach-Zehnder modulator, power divider, optical filter, and other devices, we realized the dual services of multi-channel wireless and wireline signals with high-frequency efficiency and simple structure. This method reduces the influence of signal interference and optical fiber dispersion effect, avoids the limitation of transmission distance, and improves the reliability of the system. The experimental results show that the power penalty of 5 Gb/s OOK baseband wireline signal after 80-km SMF transmission is only 1 dB, and the power penalty of 15 GHz and 30 GHz signals carrying 5 Gbaud QPSK after 80-km SMF transmission are 2 dB and 4 dB, respectively.