Opt Lett. 2013 Nov 15;38(22):4712-5. doi: 10.1364/OL.38.004712.
We propose and experimentally demonstrate an optical wireless integration system at the Q-band, in which up to 40 Gb/s polarization multiplexing multilevel quadrature amplitude/phase modulation (PM-QAM) signal can be first transmitted over 20 km single-mode fiber-28 (SMF-28), then delivered over a 2 m 2 × 2 multiple-input multiple-output wireless link, and finally transmitted over another 20 km SMF-28. The PM-QAM modulated wireless millimeter-wave (mm-wave) signal at 40 GHz is generated based on the remote heterodyning technique, and demodulated by the radio-frequency transparent photonic technique based on homodyne coherent detection and baseband digital signal processing. The classic constant modulus algorithm equalization is used at the receiver to realize polarization demultiplexing of the PM-QAM signal. For the first time, to the best of our knowledge, we realize the conversion of the PM-QAM modulated wireless mm-wave signal to the optical signal as well as 20 km fiber transmission of the converted optical signal.
我们提出并实验演示了一种在 Q 波段的光无线集成系统，其中高达 40 Gb/s 的偏振复用多电平正交幅度/相位调制（PM-QAM）信号可以首先在 20km 的单模光纤-28（SMF-28）上传输，然后通过 2m 2×2 多输入多输出无线链路传输，最后在另一个 20km 的 SMF-28 上传输。基于远程外差技术生成 40GHz 的 PM-QAM 调制无线毫米波（mm-wave）信号，并通过基于同相相干检测和基带数字信号处理的射频透明光子技术进行解调。在接收器中使用经典的恒模算法均衡器来实现 PM-QAM 信号的偏振解复用。据我们所知，这是首次实现 PM-QAM 调制无线 mm-wave 信号到光信号的转换，以及转换后的光信号在 20km 光纤中的传输。
