Digital Longitudinal Monitoring of Optical Fiber Communication Link
Digital Longitudinal Monitoring of Optical Fiber Communication Link
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DOI：
10.1109/jlt.2021.3139167
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发表时间：
2022-04
影响因子：
4.7
通讯作者：
T. Sasai;M. Nakamura;E. Yamazaki;Shuto Yamamoto;H. Nishizawa;Y. Kisaka
中科院分区：
文献类型：
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作者：
T. Sasai;M. Nakamura;E. Yamazaki;Shuto Yamamoto;H. Nishizawa;Y. Kisaka
光传输链路一般由光纤、光放大器和光滤光片组成。在本文中，我们提出了一种信道重建方法（CRM），该方法仅从数据承载信号的接收端（Rx）数字信号处理（DSP）中提取多链路组件的物理特性，如纵向光纤损耗、色散（CD）、多个放大器的增益谱和多个滤波器的响应。该概念是在数字域中重建实际传输通道的虚拟副本，其中光纤和放大器被建模为Manakov方程的分步傅里叶方法，而光学滤波器被模拟为复值有限脉冲响应滤波器。我们从边界条件（即发送和接收信号）估计模型参数，如损耗、CD、增益和滤波器响应。实验结果表明，与传统的光时域反射仪和光谱分析仪等模拟测试设备不同，CRM可以在Rx DSP中可视化光纤、放大器和滤波器的多跨特性，从而在不直接测量的情况下定位多个异常分量。
Optical transmission links are generally composed of optical fibers, optical amplifiers, and optical filters. In this paper, we present a channel reconstruction method (CRM) that extracts physical characteristics of multiple link components such as longitudinal fiber losses, chromatic dispersion (CD), multiple amplifiers’ gain spectra, and multiple filters’ responses, only from receiver-side (Rx) digital signal processing (DSP) of data-carrying signals. The concept is to reconstruct a virtual copy of an actual transmission channel in the digital domain, where optical fibers and amplifiers are modeled as the split-step Fourier method for the Manakov equation while optical filters are emulated as complex-valued finite impulse response filters. We estimate the model parameters such as losses, CD, gains, and filter responses from boundary conditions, i.e., transmitted and received signals. Experimental results show that, unlike traditional analog testing devices such as optical time-domain reflectometers and optical spectrum analyzers, CRM visualizes multi-span characteristics of fibers, amplifiers, and filters in Rx DSP, and thus localizes anomaly components among multiple ones without direct measurement.