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最小方形辅助的BCJR算法用于在带宽有限的IM/DD光学互连中严重的ISI缓解
Optics express
|August 13, 2025
概括
一个新的最小平方辅助巴尔,科克,杰利尼克和拉维夫 (LS-BCJR) 算法增强了光学互连系统. 这种方法显著提高了接收器对160 Gb/s脉冲振幅调制信号的灵敏度,减轻了符号间干扰.
科学领域:
- 光学通信系统 光学通信系统
- 信号处理 信号处理
背景情况:
- 符号间干扰 (ISI) 在带宽有限的光学互连中严重降低了性能.
- 脉冲振幅调制 (PAM4) 对于高速光学数据传输至关重要.
- 准确的符号检测对于保持信号完整性至关重要.
研究的目的:
- 提出并实验验证一种新的检测算法,用于减轻强度调制直接检测 (IM/DD) PAM4系统中的ISI.
- 在高速光学互连中,提高接收器灵敏度和整体系统性能.
主要方法:
- 开发一个最小平方辅助的巴尔,科克,耶利尼克和拉维夫 (LS-BCJR) 检测算法.
- 使用基于训练的短点击最小平方 (LS) 均衡器来重建通道响应.
- 协助BCJR估计器对软符号决策进行优化过渡度指标计算.
主要成果:
- 在19GHz带宽内使用160Gb/s的PAM4信号进行实验演示.
- 在2.4e-2的BER下,LS-BCJR方案提高了接收器光功率灵敏度1.2dB (相对于MLSE) 和0.9dB (相对于常规BCJR).
- 与传统的BCJR方案相比,实现了3dB的最佳接收器灵敏度改进,BER值为3.8e-3.
结论:
- 拟议的LS-BCJR算法有效地减轻IM/DD PAM4光学系统中的ISI.
- 在接收器灵敏度和系统性能方面取得了显著的改进.
- 与传统的BCJR和MLSE相比,LS-BCJR为高速光学互连提供了更优质的解决方案.
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