Four-Channel WDM 640 Gb/s 256 QAM Transmission Utilizing Kramers-Kronig Receiver

Four-Channel WDM 640 Gb/s 256 QAM Transmission Utilizing Kramers-Kronig Receiver
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使用 Kramers-Kronig 接收器的四通道 WDM 640 Gb/s 256 QAM 传输

DOI:
10.1109/jlt.2019.2943122
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发表时间:
2019-11
影响因子:
4.7
通讯作者:
Chi Nan
Chi Nan
中科院分区:
工程技术2区
文献类型:
--
作者:
Zhou Yingjun;Yu Jianjun;Wei Yiran;Shi Jianyang;Chi Nan

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基于高阶正交幅度调制(QAM)的直接检测(DD)系统有望为未来短距离数据中心应用提供高频谱效率(SE),下一代标准化为800 GbE甚至1.6 TbE,考虑到带宽限制。Kramers-Kronig(KK)接收机是近年来提出的一种通过重构复光场来消除单边带(SSB)DD系统中信号-信号差拍干扰(SSBI)的有效方法。在本文中,我们作出了详细的系统性能评估应用KK接收机在128,256和512 QAM系统,通过仿真和实验演示。在20 km标准单模光纤(SSMF)上成功实现了25 GHz间隔的4 × 140 Gb/s波分复用(WDM)128 QAM和4 × 160 Gb/s WDM 256 QAM SSB KK传输。据我们所知,这是第一次在WDM系统中使用KK接收机实验证明了高达256 QAM的星座大小,净SE为5.12 B/s/Hz,并通过仿真和实验结果研究了调整载波信号功率比(CSPR)对128,256和512 QAM系统性能的影响。
Direct detection (DD) systems based on high-order quadrature amplitude modulation (QAM) is promising to provide high spectrum efficiency (SE) for future short-reach data-center applications with next generation standardization of 800 GbE or even 1.6 TbE considering bandwidth limitation. Kramers-Kronig (KK) receiver is recently proposed as an effective method to inherently remove signal-signal beat interference (SSBI) by reconstructing complex optical field in single-sideband (SSB) DD systems. In this paper, we make a detailed system performance assessment of applying a KK receiver in 128, 256 and 512 QAM systems through simulations and experimental demonstrations. 25 GHz-spaced 4 × 140 Gb/s wavelength division multiplexing (WDM) 128 QAM and 4 × 160 Gb/s WDM 256 QAM SSB KK transmissions over 20 km of standard single-mode fiber (SSMF) are successfully achieved. As far as we know, this is the first time that a constellation size as high as 256 QAM with a net SE of 5.12 b/s/Hz is experimentally demonstrated in a WDM system with KK receiver, and the effect of adjusting carrier-to-signal power ratio (CSPR) on the performance of 128, 256 and 512 QAM systems is also investigated with simulation and experimental results.
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