在一个脉冲编码的Brillouin光纤传感器中,基于相调节的周期极化杂用于极化噪声减轻
Optics letters
|January 30, 2026
概括
定期偏振混 (PS) 有效地降低了Brillouin光学时域分析光纤传感器中的噪声. 与以前的技术相比,这种新的相位调制方法提高了信号噪声比和测量精度.
科学领域:
- 光学和光子学 在光学和光子学.
- 光纤传感传感器是指光纤传感器.
- 信号处理 信号处理
背景情况:
- 极化噪声是Brillouin光学时域分析 (BOTDA) 纤维传感器的一个重大挑战.
- 定期偏振混 (PS) 是一种已知的技术,可以减轻这些噪音问题.
- 现有的方法,如声光调制 (AOM),可以引入复杂性和非局部效应.
研究的目的:
- 开发一种简化和更有效的方法来产生周期极化混.
- 为了减少系统复杂性,并减轻BOTDA传感器中的非局部效应.
- 提高BOTDA系统的信号噪声比 (SNR) 和测量精度.
主要方法:
- 利用相位调节利用相位调节器快速和慢速轴的微分调节效率来产生周期性的PS.
- 对比了基于新阶段调制的PS的性能与随机PS和以前基于AOM的方法.
- 量化了信号与噪声比率 (SNR) 的改善和布里卢恩频率转移 (BFS) 测量误差的减少.
主要成果:
- 与AOM方法相比,周期性PS的相调制方法降低了系统复杂性和非局部效应.
- 与随机PS相比,Brillouin增益的信号噪声比率大约提高了4dB.
- 避免了使用基于AOM的方法观察到的~4-MHz Brillouin频率转移测量错误.
结论:
- 阶段调制是一种可行且有利的技术,用于在BOTDA传感器中产生周期极化混.
- 这种方法提供了更好的SNR和精度,使其成为随机PS和以前的AOM技术的优越替代方案.
- 简化系统设计和减少非局部效应有助于更强大和精确的光纤传感应用.
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