面向中短距光纤通信系统的多维自适应传输技术

doi:10.11959/j.issn.1000-436x.2019237

摘要/Abstract

摘要：

基于中短距光纤通信系统特点，开展了3种高性能自适应调制编码技术研究。第一种方案在传统的比特与功率加载（BPL）的基础上引入前向纠错编码维度，实现三维自适应调制编码。该算法基于查找表分配调制与编码格式，比BPL算法的复杂度更低，传输速率更高。同样基于查找表，第二种方案借助于分块预编码实现了和传统BPL相同的速率，但削减了最高2 dB的信号功率峰均比，提高了功率效率。第三种方案采用概率整形（PS） QAM作为调制格式，以合理的复杂度为代价换取整形增益与几乎无限精细的调制粒度。依靠自适应分块预编码，在不降低速率的条件下，限制PS-QAM的数目以降低复杂度。实验表明，第三种方案实现了远优于BPL方案的速率与更高的接收机灵敏度。

关键词: 光纤通信系统, 自适应调制编码, 离散多音调制, 比特与功率加载, 前向纠错编码, 预编码, 概率整形

Abstract:

According to the features of short-to-medium reach optical fiber communication systems,three high performance adaptive modulation and coding schemes were investigated.In the first one,a new dimension,forward error correction (FEC),was introduced to the traditional bit and power loading (BPL) scheme,and the three-dimensional adaptive modulation and coding were achieved.The modulation format and FEC code were allocated based on look-up table (LUT).The proposed algorithm has lower complexity and higher data rate compared to the BPL scheme.The second one was also based on LUT method where one similar data rate with the BPL scheme was achieved using partitioned precoding,but peak-to-average power ratio was reduced up to two dB,and the power efficiency was improved.In the last scheme,probabilistic shaping QAM was adopted as the modulation format,and shaping gain and almost indefinitely fine modulation granularity were achieved at the expense of certain complexity.With adaptive partitioned precoding,without decreasing data rate the number of PS-QAM was limited to reduce the complexity.The experimental results demonstrate that the proposed scheme outperforms the BPL scheme in terms of data rate and receiver sensitivity.

Key words: optical fiber communication system, adaptive modulation and coding, discrete multi-tone, bit and power loading, forward error correction, precoding, probabilistic shaping

中图分类号:

TP914

唐明,陈曦. 面向中短距光纤通信系统的多维自适应传输技术[J]. 通信学报, 2019, 40(11): 156-170.

Ming TANG,Xi CHEN. Multi-dimensional adaptive transmission technique for shortto-medium reach optical fiber communication system[J]. Journal on Communications, 2019, 40(11): 156-170.

图/表 17

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图2

表1

DMT传输系统模型参数"

参数	数值	单位
光载波中心频率	193.4	THz
光载波线宽	1	MHz
任意波形发送器采样率	6.25	GSa/s
数字存储示波器采样率	25	GSa/s
循环前缀比例	0.092
训练序列比例	0.167
电低通滤波器带宽	3.125	GHz
光带通滤波器带宽	30	GHz
光纤长度	50	km
光纤损耗	0.2	dB/km
光纤色度色散	16	ps/(nm·km)
光纤非线性系数	0.001 3	1/(W·m)
光纤偏振膜色散系数	0.003	$P s / m^{\frac{1}{2}}$
EDFA增益	20	dB
EDFA噪声系数	5	dB
光探测器响应度	1	A/W
光探测器热噪声	10^-12	$A / H z^{\frac{1}{2}}$

表1

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