鉴于长距离隧道内复杂的无线传输环境, 传统通信技术不能满足旅客高质量的通信需求, 提出了一种基于波分复用无源光网络的光载无线(RoF)分布式隧道通信系统。采用波分复用技术实现不同业务在光域的物理隔离, 协同分布式天线技术, 在隧道内部提供高频无线接入, 提升系统带宽的同时解决了隧道内部信号急剧衰减的问题。通过实验搭建了全双工的光载无线试验平台, 实现了用光学的方法产生和传输载频为24 GHz的16/64QAM矢量信号, 并且通过测量上下行链路的EVM值验证了方案的可行性。

Due to the poor wireless transmission in the long tunnels, conventional communication technique cannot meet the high-quality communication demands of the passengers. A ROF (Radio over Fiber) distributed tunnel communication system employing WDM-PON (Wavelength Division Multiplex-Passive Optical Network) was proposed. By combining the WDM and DAS (Distributed Antenna System) techniques, a wireless access network can be achieved to provide different wireless services through optical channels. Moreover, the transmission bandwidth can be increased by using this proposed scheme which can also suppress the signal degradation under the scenario of tunnel transmission. A full-duplex ROF platform was experimentally demonstrated. The optical generation and transmission of electrical 16/64QAM vector signals at 24 GHz were achieved. And the feasibility of the scheme was verified by measuring the EVM value of the uplink and downlink.