Concept and implementation study of advanced DSP-based fiber-longitudinal optical power profile monitoring toward optical network tomography [Invited]

Tanimura, Takahito; Yoshida, Setsuo; Tajima, Kazuyuki; Oda, Shunri; Hoshida, Takeshi

doi:10.1364/jocn.425494

Cited by 23 publications

(18 citation statements)

References 19 publications

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“…The link tomography is the first obvious step towards the design of a networkwide tomography [13]. In this network-level design, however, frequency continuity along the same route is not a reality as optical channels can be added/dropped at intermediate nodes.…”

Section: Link Tomographymentioning

confidence: 99%

“…However, despite the variety of optical performance monitoring (OPM) techniques and devices traditionally This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see https://creativecommons.org/licenses/by/4.0/ employed in current commercial optical systems, a central and open question in the optical communication community is: how to efficiently distribute monitors across complex networks in a cost-effective way in order to capture wavelength-resolved, spatially-distributed information [13]? Recently, several monitoring features have been obtained by solely exploiting receiver (Rx) digital signal processing (DSP) modules [14]- [18], thus minimizing the requirements of distributed node-level measurement devices.…”

Section: Introductionmentioning

confidence: 99%

“…One successful example of such application was introduced in [14], where the authors proposed an in-situ power profile estimator (PPE) that reconstructs the channel power evolution along the link with sub-km resolutions [15]. An insightful application that we foresee from this technique is that by overlaying the in-situ PPE from multiple WDM channels it is possible to create a distancewise, wavelength-dependent link tomography [13]. This link tomography embodies the relation power versus wavelength versus distance and discloses multi-degree characteristics of the optical link, later explored in this text.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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: Link Tomographymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…Caio Santos, Robert Emmerich, Behnam Shariati, Colja Schubert, Johannes K. Fischer and Ronald Freund are with the Fraunhofer receiver (Rx) based digital signal processing (DSP) methods have been extensively explored to estimate properties of optical fiber links [7]- [17], thus relaxing the demanding requirements of deploying multiple and expensive node-level measurement devices. Thanks to their capability in unveiling multi-span link characteristics, such as longitudinal power evolution [7]- [12], frequency response of optical filters [12], chromatic dispersion mapping [13], Raman gain [14], and polarization-dependent loss [15], these Rx-DSP monitoring methods have gained a momentum over the past few years. One successful example of Rx-DSP for estimation of link properties was demonstrated in [8], the so-called in-situ power profile estimator (PPE).…”

Section: Introductionmentioning

confidence: 99%

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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“…The capacity of DWDM optical transmission system can be increased significantly with the application of digital signal processing (DSP). To enable advanced modulation formats, the requirement of better DSP is also increasing rapidly [22]. The phase recovery algorithms for the complicated modulation formats are already investigated in [23,24], but more complicated DSPs bring us extra costs, and the conventional DSP-based receivers require high-power consumption.…”

Section: Introductionmentioning

confidence: 99%

Two-Dimensional Transmission of Four-Dimensional LDPC-Coded Modulation with Slepian Sequences for DSP-Free 40 km Metro Network Applications

Han

Djordjević

2022

Sensors

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The growing data demands are pushing researchers to pay more attention to spectrally efficient modulation formats. The four-dimensional (4D) signal constellation modulation format has been investigated for metro networks’ applications to achieve better power efficiency. To cope with such modulation formats, the requirement of better digital signal processing (DSP) is also increasing rapidly. More complicated DSPs bring us extra costs; thus, the DSP-free coherent receivers are also investigated because of the high-power consumption of conventional DSP-based receivers, but the transceivers upgrading also results in extra costs. In this invited paper we implement a 4-dimentional modulation format based on Slepian sequences. We applied LDPC coding and experimentally investigated the BER performance in a two-dimensional (2D) 40 km fiber link transmission and demonstrate that being error free is possible without employing the complicated DSP. We compared our proposed modulation scheme with regular 16QAM and found it outperforms 16QAM with DSP over back-to-back transmission by 3.8 dB improvement in OSNR when BER = 10−5, while over 40 km metro network communication link our proposed 4D modulation signals are still successfully transmitted, and the LDPC-coding still works properly with such a new transmission strategy. On the other hand, DSP-free transmission of LDPC-coded 16-QAM exhibits an early error floor phenomenon.

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Concept and implementation study of advanced DSP-based fiber-longitudinal optical power profile monitoring toward optical network tomography [Invited]

Cited by 23 publications

References 19 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

Two-Dimensional Transmission of Four-Dimensional LDPC-Coded Modulation with Slepian Sequences for DSP-Free 40 km Metro Network Applications

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