Feng Xia, Ye Jia, Yan Lianshan, Luo Jianwei, Li Peng, Pan Wei, Zou Xihua, Luo Bin
Opt Express. 2021 Aug 2;29(16):25868-25875. doi: 10.1364/OE.432973.
Radio-over-fiber (RoF) transmission is a quite reliable technology to support the current and future demands of rapidly progressing broadband wireless network with large capacity and high spectral efficiency. In this paper, we report and demonstrate a digital RoF transmission system using two-dimensional discrete cosine transform with vector quantization (2D-DCT-VQ). By employing the 2D-DCT-VQ technique, the spectral efficiency can be greatly improved, while the system performance is comparable to the traditional approach without compression. The proposed method is experimentally demonstrated in a 20-km 5-Gbaud/λ four-level pulse modulation intensity-modulation/direct-detection optical link. In the orthogonal frequency-division multiplexing -modulated downlink illustrated experimentally, the transmission rate rises by 69.49% on account of the compressed samples by using the proposed method.
光纤无线（RoF）传输是一种相当可靠的技术，可满足当前和未来对具有大容量和高频谱效率的快速发展的宽带无线网络的需求。在本文中，我们报告并演示了一种使用二维离散余弦变换和矢量量化（2D-DCT-VQ）的数字RoF传输系统。通过采用2D-DCT-VQ技术，可以大大提高频谱效率，同时系统性能与传统的无压缩方法相当。该方法在20公里、5 Gbaud/λ的四电平脉冲调制强度调制/直接检测光链路中进行了实验验证。在实验展示的正交频分复用调制下行链路中，由于使用该方法对样本进行了压缩，传输速率提高了69.49%。
