Z. Jia, H. Chien, Junwen Zhang, Yi Cai, Jianjun Yu
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引用次数: 0
摘要
在同一平台上，研究了基于三种高阶正交调幅(QAM)格式(8/16/32-QAM)的双载波400G方案的性能。我们首先研究了灰度编码和差分编码的优势和劣势，然后在灵活的收发器配置和相同的仅edfa的SSMF链路下实验比较了OSNR灵敏度和传输性能。实验结果表明，42-GBaud PM-8QAM的实现代价为1.85 dB，比32-GBaud PM-16QAM和25-GBaud PM-32QAM在5.92 dB q2因子(对应于2.4E-2的误码)下分别提高1 dB和1.5 dB。42.6 gbaud PM-8QAM最大传输距离为2460 km, 32 gbaud PM-32QAM最大传输距离为1640 km, 25 gbaud PM-32QAM最大传输距离为820 km。此外，还比较了级联多模算法(CMMA)和决策导向最小均方算法(DD-LMS)的性能。研究了增加一个采样/符号的DD-LMS数字滤波器的改进。
Dual-carrier 400G solutions based on 8/16/32-QAM modulation formats
The performance of dual-carrier 400G solutions based on three high-order quadrature amplitude modulation (QAM) formats (8/16/32-QAM) is investigated on the same platform. We first study the benefit and penalty differences of Gray and differential coding, and then experimentally compare OSNR sensitivities and transmission performance using flexible transceiver configuration and the same EDFA-only SSMF link. Experimental results show the implementation penalties are 1.85 dB for 42-GBaud PM-8QAM, which is 1 dB and 1.5 dB better than 32-GBaud PM-16QAM and 25-GBaud PM-32QAM at 5.92-dB Q2-factor (corresponding to a BER of 2.4E-2), respectively. It is also found that maximum reaches of 2460 km for 42.6-GBaud PM-8QAM, 1640 km for 32-GBaud 16QAM, and 820 km for 25-GBaud PM-32QAM are achieved. Furthermore, the performances of cascaded multi-modulus algorithm (CMMA) and decision-directed least mean square (DD-LMS) algorithms are also compared. The improvement by addition of one sample/symbol based DD-LMS digital filter is investigated as well.
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