通过SNR增强的OAM模式分割多重复合与基于级联delta-sigma调制的带内噪声调制
Optics express
|January 29, 2025
概括
一种新的级三角信号调制 (CDSM) 方案增强了轨道角动量 (OAM) 模块化分割多重复合 (MDM) 系统,实现高保真度240 Gbit/s传输,并改进了信号噪声比 (SNR). 这种先进的OAM-MDM系统超越了传统的方法,实现了高容量的光通信.
科学领域:
- 光学通信是指光学通信.
- 信号处理 信号处理
- 光纤光学是指光纤的使用.
背景情况:
- 由于模式合,高信号噪声比 (SNR) 对轨道角动量 (OAM) 模块化分裂多重复合 (MDM) 系统至关重要.
- 现有的传统的三角信号调制 (TDSM) 方案在改善OAM-MDM系统的传输性能方面存在局限性.
研究的目的:
- 为OAM-MDM强度调制和直接检测 (IM/DD) 传输提出并实验验证一套级三星模拟 (CDSM) 方案.
- 通过减少量子化噪声和改善OAM-MDM系统中的SNR来提高传输性能.
主要方法:
- 引入了一个CDSM方案,将信号和带内噪声调制分开,并通过时间分割多重复合 (TDM) 结合输出.
- 接收器减去调制序列以消除带内噪声,改善噪声塑造.
- 在2公里环芯光纤 (RCF) 上以240 Gbit/s的实验验证使用两个OAM模式,比较CDSM与TDSM和多阶段DSM (MDSM).
主要成果:
- 对于OAM模式,CDSM方案成功实现了16777216个QAM信号传输,比特错误率 (BER) 低于软决策向前错误校正 (SD-FEC) 15%的门.
- CDSM的表现优于TDSM和MDSM方案,OAM模式l=3的接收器灵敏度提高了2.5dB,相比TDSM和MDSM,SNR增幅分别为7.1dB和3dB.
- 该CDSM方案使高保真波形恢复和传输成为可能.
结论:
- 与TDSM和MDSM相比,拟议的CDSM方案显著提高了OAM-MDM传输性能.
- CDSM提供卓越的降噪和SNR增益,使其对高容量的OAM-MDM光纤通信系统具有极大的优势.
- 实验结果证实了CDSM在高保真数据传输方面的有效性.
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