一种载边比可调单边带全双工光载无线系统

理论分析了一种基于双平行马赫曾德尔调制器(MZM)的2 倍频光单边带调制方案,仿真研究了基于 该方案的载波重用全双工光载无线(RoF)通信系统性能。合理设置射频驱动信号相移及双平行MZM 主调制器偏置 电压产生单边带信号,再调整调制指数以实现光载边比ROCS 的连续可调谐。讨论了射频信号相移、主调制器偏置电 压、双平行MZM 消光比RE 和调制指数对ROCS 的影响,理论分析与仿真结果较为一致。结果表明经20 km 光纤传输 后,在误码率BER 为10-9 时0 dB 和10. 33 dB 载边比系统的功率代价分别为2.5 dB 和3.4 dB,在背靠背(BtB)传输 中当载边比从10. 33 dB 降低至0 dB 后,接收机灵敏度提高了2.6 dB。

Optical Single Sideband Full-Duplex RoF System with Continuously Tunable Optical Carrier-to-Sideband Ratio

A novel doubling frequency modulation scheme of optical single sideband based on dual-parallel Mach-Zehnder modulator (MZM) is analyzed theoretically, and the performance of carrier reuse full-duplex radio over fiber (RoF) system based on this scheme is simulated. By setting the phase shift of radio frequency (RF) driving signal and the bias voltage of dual-parallel MZM main modulator, the optical single sideband signal is generated, and then the modulation index is adjusted to realize the continuous tunability of optical carrier-to-sideband ratio (ROCS). The effects of RF signal phase shift, main modulator bias voltage, dual-parallel MZM extinction ratio (RE) and modulation index on ROCS are discussed, and the theoretical analysis results are consistent with that of simulations. The results show that the power penalties are 2. 5 dB and 3. 4 dB for ROCS =0 dB and ROCS =10. 33 dB at BER =10-9, respectively, and the receiver sensitivity is increased by 2. 6 dB when ROCS is reduced from 10. 33 dB to 0 dB.