Opt Lett. 2019 Jan 1;44(1):155-158. doi: 10.1364/OL.44.000155.
A Hilbert-transform-based broadband chromatic dispersion (CD) compensation scheme for radio-over-fiber links is proposed and experimentally demonstrated. By constructing a Hilbert transform path, CD-induced phase shifts, which initially lead to periodic power fading of the output RF signals, are transferred to the phases of the RF signals. As a result, the powers of the output RF signals are free from the effect of CD in a broadband frequency range. Experimental results show that a flat normalized amplitude-frequency response is actualized within 2-24 GHz, with only 3.02 dB/4.27 dB power fluctuation after transmission over an equivalent of a 38.6 km/43.6 km single-mode fiber. Besides, compared with a conventional dispersive path, the proposed CD compensation scheme significantly improves the third-order spurious-free dynamic range by 23.60 dB.
提出并实验演示了一种基于希尔伯特变换的光纤中射频信号宽带色度色散（CD）补偿方案。通过构造希尔伯特变换路径，CD 引起的相位偏移最初导致输出射频信号的周期性功率衰落，被转移到射频信号的相位中。因此，在宽带频率范围内，输出射频信号的功率不受 CD 的影响。实验结果表明，在 2-24GHz 频率范围内实现了平坦的归一化幅度-频率响应，在经过相当于 38.6km/43.6km 单模光纤的传输后，功率波动仅为 3.02dB/4.27dB。此外，与传统的色散路径相比，所提出的 CD 补偿方案将三阶无杂散动态范围提高了 23.60dB。
