Zhang Kun, Zhao Shang Hong, Wen Ai Jun, Zhang Wu, Zhai Wei Le, Lin Tao, Li Xuan
Opt Lett. 2019 Aug 15;44(16):4004-4007. doi: 10.1364/OL.44.004004.
A photonic approach to realizing anti-chromatic dispersion transmission for a frequency and bandwidth-doubling dual-chirp microwave waveform is proposed and experimentally demonstrated. The system has no requirement on polarization devices or optical filters for only the integrated dual-drive dual-parallel Mach-Zehnder modulator employed. To overcome chromatic dispersion, the carrier frequency suppression approach is proposed. The anti-chromatic dispersion process is accomplished in a central station and independent to carrier frequency, fiber length, and dispersion coefficients. An experiment is conducted to verify the analysis. Dual-chirp waveforms at 13 GHz with a bandwidth of 0.8 GHz and time duration of 1 μs are obtained. After 25 km fiber transmission, the proposed approach shows a relatively flat curve in a frequency-power diagram, while the normally carrier-suppressed double-sideband modulation method experiences a significant power fading for fiber dispersion.
提出并通过实验证明了一种用于实现频率和带宽加倍的双啁啾微波波形的抗色散传输的光子学方法。该系统仅采用集成双驱动双平行马赫曾德尔调制器，对偏振器件或光学滤波器没有要求。为了克服色散，提出了载波频率抑制方法。抗色散过程在中心站完成，与载波频率、光纤长度和色散系数无关。进行了实验以验证分析结果。获得了带宽为0.8GHz、持续时间为1μs的13GHz双啁啾波形。经过25km光纤传输后，所提方法在频率-功率图中显示出相对平坦的曲线，而常规的载波抑制双边带调制方法因光纤色散出现显著的功率衰落。
