Xiao Zhuopeng, Li B, Fu Songnian, Deng L, Tang M, Liu Deming
Opt Lett. 2017 Mar 15;42(6):1072-1075. doi: 10.1364/OL.42.001072.
We demonstrate faster-than-Nyquist (FTN) transmission with a novel mitigation scheme of intercarrier interference. To the best of our knowledge, it is the first experimental demonstration of FTN PDM-16QAM transmission over standard single mode fiber (SSMF). Due to the use of maximum likelihood sequence detection and multi-input multi-output processing for severely overlapped Nyquist-PDM-16QAM carriers, 5.4-dB optical signal-to-noise ratio improvement is experimentally observed under the scenario of 2×16-GBd PDM-16QAM back-to-back transmission with a carrier spacing of 15 GHz. A net spectral efficiency up to 7.68 b/s/Hz is achieved by transmission of a 15-GHz spaced dual-carrier superchannel over 960-km SSMF, with hard decision forward error correction taken into account. Furthermore, FTN superchannel transmission with carrier spacings of 14 and 15 GHz are successfully realized over 960- and 1920-km SSMFs, respectively.
我们通过一种新型的载波间干扰缓解方案展示了超奈奎斯特（FTN）传输。据我们所知，这是首次在标准单模光纤（SSMF）上进行FTN偏振复用16正交幅度调制（PDM-16QAM）传输的实验演示。由于对严重重叠的奈奎斯特-PDM-16QAM载波使用了最大似然序列检测和多输入多输出处理，在2×16-Gbaud PDM-16QAM背靠背传输、载波间隔为15 GHz的情况下，实验观察到光信噪比提高了5.4 dB。通过在960公里的SSMF上传输15 GHz间隔的双载波超通道，并考虑硬判决前向纠错，实现了高达7.68 b/s/Hz的净频谱效率。此外，分别在960公里和1920公里的SSMF上成功实现了载波间隔为14 GHz和15 GHz的FTN超通道传输。
