基于双驱动 MZM 和 chirp-dispersion 互动的比特重感知高保真数字 RoF 前程
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概括
数字无线电光纤系统使用新型不均光脉冲振幅调制 (PAM-4/8) 方案来保护高重位. 这种方法利用声分散相互作用,在前程运输链路中显著改善信号噪声比 (SNR).
科学领域:
- 光学通信是指光学通信的应用.
- 信号处理 信号处理
- 无线网络是无线网络.
背景情况:
- 数字无线电在光纤 (D-RoF) 系统量化无线波形,以提高前程链路的噪声耐受性.
- 量子化位具有不同的重量,使得重量较高的位能够有针对性的保护.
- 双驱动式马赫-泽恩德调制器 (DD-MZM) 中的片状分散相互作用可以诱导眼睛的闭/开,从而有可能在SNR受限区域中提高信号保真度.
研究的目的:
- 在光学前程中理论上模拟声和分散诱导的眼睛闭/开.
- 提出和演示用于增强比特保护的新型不均光学PAM-4和PAM-8方案.
- 评估通过这些方案在强度调制和直接检测 (IM-DD) D-RoF系统中实现的SNR收益.
主要方法:
- 建立了对星座间隔的声和分散效应的理论模型.
- 开发了两个不均的光学PAM-4方案,通过交错位并将它们加载到DD-MZM臂上,以利用声特征.
- 提出了两个不均的光学PAM-8方案,具有不同的频率声来保护关键位.
- 在IM-DD D-RoF系统中实验证明了这些方案,并将它们与无声方法进行了比较.
- 使用μ-law和Lloyd-Max量化器来验证方案的有效性,并最大限度地提高SNR.
主要成果:
- 提出的不均的光学PAM-4/8方案显示了显著的SNR收益.
- 在5公里光纤传输后,对不均的光学PAM-4实现了11.3dB的SNR增益.
- 在5公里光纤传输后,对不均的光学PAM-8观察到4.8dB的SNR增益.
- 通过使用不同的量化方法来验证方案的有效性.
结论:
- 晶片分散相互作用为D-RoF系统中增强信号保真提供了一个可行的机制.
- 不均的光学PAM-4/8方案有效地保护高重位,从而大幅改善SNR.
- 提出的方法为优化光学前程网络性能提供了一个有希望的策略.
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