论文部分内容阅读
设计了一个基于频率选路的DWDM-ROF系统。通过30 GHz射频信号驱动相位调制器,对4个间隔为100 GHz的光信道进行双边带调制,产生12个光信道。采用分插复用器将边带分成两组,一组边带分别加载2.5 Gb/s的数据,另一组不做任何变化,然后两路共同耦合进入下行光纤传输50 km,此方案最多可以解复用至6个基站分别接收毫米波信号后供天线发射,并且可以对任意信道进行选路复用。结果表明,通过4路的信道产生6路的毫米波信号,具有较高的频谱效率,同时系统信道间串扰对系统影响不大。
A DWDM-ROF system based on frequency routing is designed. The phase modulator is driven by a 30 GHz RF signal to double-band 4 optical channels at 100 GHz intervals to produce 12 optical channels. The sidebands are divided into two groups using add / drop multiplexer. One sidebands are respectively loaded with 2.5 Gb / s data, the other side is changed without any change. Then the two paths are coupled together into the downlink optical fiber transmission 50 km. This scheme can be up to Demultiplexing to 6 base stations to receive the millimeter wave signal for the antenna to transmit respectively and to perform channel multiplexing on any channel. The results show that the 6-channel millimeter-wave signal generated by 4 channels has high spectral efficiency, and crosstalk between system channels has little effect on the system.