Spectral processing techniques for efficient monitoring in optical networks

Journal of Optical Communications and Networking(2021)

引用 2|浏览9
暂无评分
摘要
Having ubiquitous optical monitors in dense wavelength-division multiplexing (DWDM) or flex-grid networks allows the estimation in real time of crucial parameters. Such monitoring would be even more important in disaggregated optical networks, to inspect performance issues related to inter-vendor interoperability. Several important parameters can be retrieved using optical spectrum analyzers (OSAs). However, omnipresent OSAs represent an infeasible solution. Nevertheless, the advent of new, relatively cheap, compact and medium-resolution optical channel monitors (OCMs) enable a more intensive deployment of these devices. In this paper, we identify two main scenarios for the placement of such monitors: at the ingress and at the egress of the optical nodes. In the ingress scenario, we can directly estimate the parameters related to the signals, but not those related to the filters. On the contrary, in the egress scenario, the filter-related parameters can be easily detected, but not those related to amplified spontaneous emission. Therefore, we present two methods that, leveraging a curve fitting and a machine learning regression algorithm, allow detection of the missing parameters. We verify the proposed solutions with spectral data acquired in simulation and experimental setups. We obtained good estimation accuracy for both setups and for both studied placement scenarios. It is noteworthy that in the experimental assessment of the ingress scenario, we achieved a maximum absolute error (MAE) lower than 1 GHz in filter bandwidth estimation and a MAE lower than 0.5 GHz in filter frequency shift estimation. In addition, by comparing the relative errors of the considered parameters, we identified the ingress scenario as the more beneficial. In particular, we estimated the filter central frequency shift with 84% and the filter 6 dB bandwidth with 75% higher accuracy, with respect to datasheet/reference values. This translates into a total reduction of the estimated signal-to-noise ratio (SNR) penalty, introduced by a single optical filter, of 0.24 dB.
更多
查看译文
关键词
omnipresent OSA,disaggregated optical networks,flex-grid networks,dense wavelength-division multiplexing,ubiquitous optical monitors,spectral processing techniques,single optical filter,estimated signal-to-noise ratio,filter central frequency shift,filter frequency shift estimation,filter bandwidth estimation,maximum absolute error,spectral data,missing parameters,amplified spontaneous emission,filter-related parameters,egress scenario,ingress scenario,optical nodes,intensive deployment,medium-resolution optical channel monitors,optical spectrum analyzers,inter-vendor interoperability,frequency 1.0 GHz,frequency 0.5 GHz,noise figure 6.0 dB,noise figure 0.24 dB
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要