We propose a hybrid full duplex passive optical network with fusion of wavelength-division-multiplexing and orthogonal frequency-division multiplexing (WDM-OFDM) for a radio-over-fiber (RoF) system application. The key of the system is a tunable optical frequency comb (OFC) embedded cascading modulators and a parameter mixer. Moreover, 23 frequency components with 0.6 dB flatness generated by the OFC are used as light sources for each WDM channel. We utilize a 7.5 GHz OFDM wired signal and a 12.5 GHz OFDM wireless signal for downstream transmission and 10 Gb/s OOK (on–off keyed) signals for upstream traffic. Using polarization multiplexing technique, we extract a central optical carrier to bear the upstream signal so that no excess optical source is introduced into the ONU. Thus, the intricacy and costs of system are diminished. Moreover, successful transmission has been demonstrated since the bit error rates of the downstream and upstream signals are always under the adopted forward error correction limit. Furthermore, the proposed system can enhance power budget and reduce cost, which has a promising prospect for future wireless communication.

中文翻译：

---

具有波长复用功能的可调谐多波长光梳启用 RoF-OFDM-PON

我们为光纤无线电 (RoF) 系统应用提出了一种融合了波分复用和正交频分复用 (WDM-OFDM) 的混合全双工无源光网络。该系统的关键是可调谐光频梳（OFC）嵌入式级联调制器和参数混频器。此外，OFC 产生的具有 0.6 dB 平坦度的 23 个频率分量用作每个 WDM 通道的光源。我们使用 7.5 GHz OFDM 有线信号和 12.5 GHz OFDM 无线信号进行下行传输，并使用 10 Gb/s OOK（开关键控）信号进行上行流量。使用偏振复用技术，我们提取一个中心光载波来承载上行信号，从而不会将多余的光源引入ONU。因此，减少了系统的复杂性和成本。而且，由于下行和上行信号的误码率总是在所采用的前向纠错限制之下，因此成功传输已被证明。此外，所提出的系统可以增强功率预算并降低成本，这对未来的无线通信具有广阔的前景。