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.

中文翻译：

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使用矢量量化的二维离散余弦变换提高数字光纤传输的频谱效率

光纤无线电 (RoF) 传输是一种非常可靠的技术，可满足当前和未来快速发展的大容量和高频谱效率宽带无线网络的需求。在本文中，我们报告并演示了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，同时系统性能与不压缩的传统方法相当。所提出的方法在 20 公里 5-Gbaud/λ 四级脉冲调制强度调制/直接检测光链路中进行了实验证明。在实验说明的正交频分复用调制下行链路中，传输速率提高了69。