In this paper, to the best of our knowledge, we propose the first multi-rate Nyquist-subcarriers modulation (SCM) for C-band 100Gbit/s signal transmission over 50km dispersion-uncompensated link. Chromatic dispersion (CD) introduces severe spectral nulls on optical double-sideband signal, which greatly degrades the performance of intensity-modulation and direct-detection systems. Based on the prior knowledge of the dispersive channel, Nyquist-SCM with multi-rate subcarriers is proposed to keep away from the CD-caused spectral nulls flexibly. Signal on each subcarrier can be individually recovered by a digital signal processing, including the feed-forward equalizer with no more than 31 taps, a two-tap post filter, and maximum likelihood sequence estimation with one memory length. Combining with entropy loading based on probabilistic constellation shaping to maximize the capacity-reach, the C-band 100Gbit/s multi-rate Nyquist-SCM signal over 50km dispersion-uncompensated link can achieve 7% hard-decision forward error correction limit and average normalized generalized mutual information of 0.967 at received optical power of -4dBm and optical signal-to-noise ratio of 47.67dB. In conclusion, the multi-rate Nyquist-SCM shows great potentials in solving the CD-caused spectral distortions.
翻译：在本文中,据我们所知,我们建议为C-波段100Gbit/50公里分散和无补偿连接的C-波段100Gbit/s信号传输提供第一个多频度 Nyquist-subcarrier 调制(SCM) C-波段100Gbit/s信号传输超过50公里分散-无补偿链接。色相分散(CD)在光学双侧带信号上引入了严格的光谱内核内核内核内核内核内核内核内核调调调制(SCM),这大大降低了强度调制和直接探测系统的性能。基于散射电信道先前的知识,建议Nyquist-SCM(Nyquist-SCM)的多频谱变制(SCM)不灵活。每个子机的信号信号传输可以通过数字信号处理单独回收,包括不超过31个开关、两通后过滤器的进向均分,以及最大可能以一个记忆长度进行测测测测测测测测测。结合根据稳定型星座的星座变星座后,以最大波段100G-Nyquist-CMY-CML4号平均分散-CMLS-CM-CMLS-CMS-S-S-S-S-S-C-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-C-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-
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