Link Tomography for Amplifier Gain Profile Estimation and Failure Detection in C+L-band Open Line Systems

Sena, Matheus; Emmerich, Robert; Shariati, Behnam; Fischer, Johannes; Freund, Ronald

doi:10.1364/ofc.2022.th1h.1

Cited by 8 publications

(19 citation statements)

References 5 publications

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“…This is demonstrated by running a single-channel experimental campaign in a C+L-band setup over 280 km of single mode fiber (SMF). In this study, we extend our previous contribution presented in [19] by:…”

Section: Introductionsupporting

confidence: 76%

“…Particularly, the link tomography is a major feature in at least two important contexts in the field of optical communications. First, it can be used in cognitive optical networks [19]. This is possible because the device (in this case the receiver) can "sense" events in the link, such as the appearance of gain tilts, and be used to trigger automatic decisions carried out by a network controller.…”

Section: Introductionmentioning

confidence: 99%

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DSP-Based Link Tomography for Amplifier Gain Estimation and Anomaly Detection in C+L-Band Systems

Sena

Emmerich

Shariati

et al. 2022

J. Lightwave Technol.

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A successful migration from current C-band based optical networks to a multiband scenario primarily depends on the development of solutions that can reliably measure physical properties of optical links over broad spectral transmission windows. Additionally, these solutions must be capable of delivering wavelength-dependent and spatially-resolved indicators that can empower network operators to identify faults before they lead to severe service disruptions. Recently, the exploitation of receiver based digital signal processing as a tool for optical performance monitoring has gained tremendous popularity. One successful example is the so-called in-situ power profile estimator, which can reconstruct the per-channel longitudinal power profile along the optical fiber link solely processing the received signal samples. In this work, we propose a novel application for the in-situ power profile estimator by harnessing it on multiple wavelengths to accurately estimate the spectral gain profile of C+L-band in-line Erbium-doped fiber amplifiers deployed in a 280-km single mode fiber link. Furthermore, we show how this scheme can be efficiently used to detect amplification-related anomalies, such as gain tilt and narrowband gain compression. In our measurements, we achieved a sub-dB estimation accuracy by comparing the proposed gain extraction approach with the back-to-back characterization obtained from an optical spectrum analyzer.

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Section: Introductionsupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

DSP-Based Link Tomography for Amplifier Gain Estimation and Anomaly Detection in C+L-Band Systems

Sena

Emmerich

Shariati

et al. 2022

J. Lightwave Technol.

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“…This method reconstructs the channel power profile along an optical link, which consequently enables the prediction of anomalous attenuation points with sub-km resolutions [9]. In our previous contribution, i.e., [16], we showed that by applying the in-situ PPE on multiple wavelengths of a C+L-band transmission system, it is possible to create a distance-wise, wavelength-dependent link tomography. This is a simple 3D-visualization of the relation power versus wavelength versus distance and helps to reveal MB characteristics of the deployed in-line optical amplifiers, e.g., spectral gain.…”

Section: Introductionmentioning

confidence: 99%

“…This is a simple 3D-visualization of the relation power versus wavelength versus distance and helps to reveal MB characteristics of the deployed in-line optical amplifiers, e.g., spectral gain. In [16], it was also shown that the link tomography can directly support the identification of failures such as anomalous gain tilt imposed by malfunctioning amplifiers. Recently, our work published in [17] also successfully demonstrated that another type of amplification fault, i.e., the narrowband gain compression caused by the spectral hole-burning (SHB) effect, can be likewise captured by using the link tomography.…”

Section: Introductionmentioning

confidence: 99%

“…Despite all credits that [16] and [17] deserve, the experimental results presented in these contributions comprise a methodology where a single wavelength-division multiplexing (WDM) channel is swept across the wavelength domain in order to capture the frequency-dependent information of the optical system. This methodology, consequently, is subject to at least two important implications.…”

Section: Introductionmentioning

confidence: 99%

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Advanced DSP-Based Monitoring for Spatially Resolved and Wavelength-Dependent Amplifier Gain Estimation and Fault Location in C+L-Band Systems

Sena

Hazarika

Santos

et al. 2023

J. Lightwave Technol.

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The development of efficient anomaly detection schemes is a key element for the implementation of autonomous optical networks as they can help telecom operators to automate the location of defective devices and track the overall performance of the network infrastructure. In that regard, the exploitation of receiver based digital signal processing (DSP) for optical performance monitoring has shown to be a promising enabler for detection of spatially resolved and wavelength-dependent properties and anomalies in optical fiber links. In this work, we study the benefits of applying DSP-based longitudinal power estimation on multiple wavelength division multiplexing (WDM) channels allocated in the optical grid to infer wavelength-wise characteristics of a C+L-band optical line system. In that context, we show that the applied scheme can successfully recreate a visualization of the spatial evolution of the gain tilt imposed by inline optical amplifiers. Additionally, we propose the utilization of advanced DSP tools based on wavelet-denoising to enhance the performance of an anomaly detection approach. The proposed method not only can improve accuracy of the fault location, by reducing positioning uncertainty, but it also delivers more uniform readings of the anomaly signatures.

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Measurement of Total and Longitudinal Nonlinear Phase Shift as Well as Longitudinal Dispersion for a Fiber-Optic Link Using a Digital Coherent Transceiver

Hui

Laperle

O’Sullivan

2022

J. Lightwave Technol.

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Link Tomography for Amplifier Gain Profile Estimation and Failure Detection in C+L-band Open Line Systems

Abstract: We experimentally demonstrate a distance-wise, wavelength-dependent link tomography extraction scheme using receiver DSP. This approach permits the estimation of gain spectrum and tilt in C+L-band EDFAs with a maximum mean absolute error of 0.6 dB.

Cited by 8 publications

References 5 publications

DSP-Based Link Tomography for Amplifier Gain Estimation and Anomaly Detection in C+L-Band Systems

DSP-Based Link Tomography for Amplifier Gain Estimation and Anomaly Detection in C+L-Band Systems

Advanced DSP-Based Monitoring for Spatially Resolved and Wavelength-Dependent Amplifier Gain Estimation and Fault Location in C+L-Band Systems

Measurement of Total and Longitudinal Nonlinear Phase Shift as Well as Longitudinal Dispersion for a Fiber-Optic Link Using a Digital Coherent Transceiver

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