多业务传输的WDM-ROF-PON系统研究

针对多业务传输的WDM-ROF-PON(融合光载无线技术的波分复用-无源光网络)系统的稳定性和业务间串扰问题,设计了一种能同时传输两种无线业务的WDM-ROF-PON系统。实验过程中,对下行链路的4路ROF信道进行了测试,系统能同时传输60GHz 2.5Gbit/s的毫米波信号和5GHz 155Mbit/s的DPSK(差分相移键控)信号,传输距离为20km。各信道中低频业务传输20km后功率代价为0.4～2.8dB,毫米波信号传输20km后功率代价为1.5～3.2dB;仅传输毫米波业务时,接收机灵敏度提升0.6～2dB。实验结果表明,各信道中两种业务的信号传输性能均良好,系统较稳定,低频业务对毫米波业务的干扰较小。

Research on WDM-ROF-PON systems for multi-service transmissions

In view of the stability of and inter-service interference effects on WDM-ROF-PON systems for multi-service transmission, a WDM-ROF-PON system for simultaneous transmission of two kinds of wireless services is designed. In the experiment, tests are performed on four ROF channels in downlinks, the results of which show that the system can simultaneously transmit 60 GHz 2.5 Gbit/s millimeter-wave signals and 5 GHz 155 Mbit/s DPSK signals for 20 km. In each channel, the power penalty in intermediate or lower frequency transmission is 0.4~2.8 dB and in the millimeter-wave transmission 1.5~3.2 dB and in millimeter-wave transmission only, the receiver sensitivity is improved by 0.6~2 dB. These results show that the signal transmission performances for both services in every channel are good, the system is stable and the millimeter-wave services are subject to minor interferences from lower frequency services.