概括
这项研究引入了一种新的算法,用于在自相干光学系统中对抗噪声,从而改善长距离数据传输. 该CEE+R-ML方法通过减轻激光线宽,色谱分散和多路径干扰的干扰来提高信号完整性.
科学领域:
- 光学通信是指光学通信.
- 信号处理 信号处理
背景情况:
- 自相连的检测是扩展范围 (ER) 和零分散范围 (ZR) 数据中心传输的关键,因为它具有低复杂性的光场恢复.
- 激光相位噪声,光纤色散 (CD) 和多路干扰 (MPI) 在实际系统中降低了性能.
- 这些因素相互作用,导致等效增强相位噪声 (EEPN),相位对振幅噪声 (P2A) 和严重的系统性能下降.
研究的目的:
- 研究激光线宽,光纤CD和MPI对自相干光通信系统的综合影响.
- 分析相位噪声诱导级联干扰 (PNICI),这是由于这些损害的相互作用而产生的.
- 提出一种新的算法来缓解PNICI并提高系统性能.
主要方法:
- 开发了一种基于载体提取的联合均等化 (CEE) 和基于递归的最大概率 (R-ML) 阶段估计算法.
- CEE通过通道估计减轻MPI诱导的干扰.
- R-ML算法减少了PNICI相位噪声,计算复杂度低于传统的ML方法.
主要成果:
- 在Kramers-Kronig接收器中使用56 GBaud 16-ary正方形振幅调制 (16-QAM) 光学单侧带 (SSB) 信号的模拟验证了CEE+R-ML方案.
- 拟议的方案增加了5.4dB的信号与干扰比 (SIR) 宽度,用于100公里传输后的1MHz激光线宽.
- 在100公里后,在25dBSIR和4MHz激光线宽下达到7%的前向错误校正 (FEC) 门.
结论:
- 该CEE+R-ML算法有效地减轻了由激光线宽,光纤CD和MPI的联合影响引起的PNICI.
- 这种方法显著提高了自相干光通信系统的性能和稳定性.
- 拟议的方法为通过延长光纤链路实现可靠的高速数据传输提供了实际解决方案.
相关概念视频
Interference and Diffraction
Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
Difference from Background: Limit of Detection
The limit of detection (LOD) is the smallest amount of analyte that can be distinguished from the background noise. The LOD value corresponds to the concentration at which the analyte signal is three times larger than the standard deviation of the blank signal. Below this value, the analyte signal cannot be differentiated from the background noise. It is calculated by dividing the calibration slope by 3 times the standard deviation of the blank signals.
The LOD indicates the presence or absence...
The LOD indicates the presence or absence...
Tandem Mass Spectrometry
Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and reduce chemical noise during analyte detection. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called...
Atomic Absorption Spectroscopy: Interference
Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
Atomic Emission Spectroscopy: Interference
In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
Reducing Line Loss
In a three-phase circuit, line loss is an indicator of energy dissipated as heat due to the resistance of transmission lines. To address this, incorporating transformers into the system—a step-up transformer at the source and a step-down transformer at the load—is a strategic solution. Two three-phase transformers are introduced to improve this.
With a step-up transformer at the source, the voltage is increased, thereby reducing the current in the transmission lines since power loss in...
With a step-up transformer at the source, the voltage is increased, thereby reducing the current in the transmission lines since power loss in...


