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计算效率高的固定状态MLSD用于100G C频段分散无补偿的IM/DD链路
Optics express
|December 19, 2025
概括
一个新的复杂性高效的最大概率序列检测 (CE-MLSD) 方案减少了高速光学系统的计算负载. 这种方法保持了比特错误率的性能,同时大大减少了高级调制格式的乘法.
科学领域:
- 光学通信是指光学通信.
- 信号处理 信号处理
- 数字通信数字通信
背景情况:
- 在高速强度调制和直接检测 (IM/DD) 系统中,最大概率序列检测 (MLSD) 对于减轻符号间干扰 (ISI) 至关重要.
- 数字噪音减白后波器 (PF) 提高了MLSD性能,但引入了显著的计算复杂性,随着波器的顺序和调制水平的指数级扩展.
研究的目的:
- 提出一个复杂性高效的MLSD (CE-MLSD) 方案,可以减少计算复杂性,同时保持高速IM/DD系统的性能.
- 通过增加过后的点击和选择性地保留主导状态和符号水平来增强频域补偿.
主要方法:
- 通过优化状态和符号级保留,开发了一个CE-MLSD方案.
- 增加了过后抽水的数量,以改善频域补偿.
- 对计算复杂性和比特错误率 (BER) 性能与其他MLSD方案进行了比较分析.
主要成果:
- 与完整状态的MLSD相比,CE-MLSD显著降低了乘法复杂性:91.67%的100Gb/s OOK,99.79%的120Gb/s PAM-4,和99.68%的120Gb/s PAM-6在指定距离上.
- 在不同的调制格式和光纤长度中保持与全状态MLSD相比较的BER性能.
- 对PAM-4和PAM-6信号来说,它比Trellis Path-Limitation MLSD (TL-MLSD) 和Fixed-State MLSD (FS-MLSD) 提供了更好的复杂性降低.
结论:
- 拟议的CE-MLSD方案有效地平衡了高速IM/DD光学系统中的计算复杂性和BER性能.
- CE-MLSD为开发具有扩展范围能力的低成本,高性能C频段IM/DD系统提供了可行的解决方案.
- 这种方法对像PAM-4和PAM-6这样的高级调制格式特别有利,使光学传输更有效.
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