Advanced Optical Performance Monitoring for Next Generation Access Networks

Chan, Calvin

doi:10.1364/oecc_ps.2013.thp1_5

Cited by 29 publications

(41 citation statements)

References 11 publications

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“…Another source of impairments in optical links is the ltering e ects of the concatenation of ROADMs. ey are based on Wavelength Selective Switches (WSS) and can be silicon-based as presented in [52]. To study the impact of ltering on SOP tracking, we used the ber model in Figure 4.…”

Section: Snr Penalty Versus Sop Transientsmentioning

confidence: 99%

Adaptive Filtering in Optical Coherent Flexible Bit-Rate Receivers in the Presence of State-of-Polarization Transients and Colored Noise

Abdo

D’Amours

2019

Journal of Computer Networks and Communications

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In this article, we analyze the performance of adaptive filtering in the context of dual-polarization coherent optical flexible bit-rate transceivers. We investigate the ability of different adaptive algorithms to track fast state-of-polarization (SOP) transients in the presence of colored noise. Colored noise exists due to the concatenation of Wavelength Selective Switches (WSSs) and polarization dependent loss (PDL) which can be considered as spatially dependent noise. We consider the use of different modulation formats, and the practical limitation of error signal feedback delay in decision-directed adaptive filters is also taken into account. The back-to-back required signal-to-noise ratio (RSNR) penalty that can be tolerated determines the maximum SOP rate of change that can be tracked by the adaptive filters as well as the filter’s adaptive step size. We show that the recursive least squares algorithm, using the covariance matrix as an aggressive “step size,” has a much better convergence speed compared to the least mean squares (LMS) and normalized LMS (NLMS) algorithms in the presence of colored noise in the fiber. However, the three algorithms have similar tracking capabilities in the absence of colored noise.

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Section: Snr Penalty Versus Sop Transientsmentioning

confidence: 99%

Adaptive Filtering in Optical Coherent Flexible Bit-Rate Receivers in the Presence of State-of-Polarization Transients and Colored Noise

Abdo

D’Amours

2019

Journal of Computer Networks and Communications

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“…Please note that all these OSA options can be operated in polarization diversity. Despite the fact that it requires doubling the spectrum acquisition resources, this option is quite interesting for monitoring purposes, as it allows to acquire a polarization resolved spectrum, giving additional advantages for extracting/deriving the suitable figures of merit of the monitored signals [3].…”

Section: Optical Spectrum Analyzermentioning

confidence: 99%

“…Therefore, a key element of the disaggregated network is the optical performance monitoring that is expected to deliver the feedback needed for guaranteeing end-to-end quality of transmission (QoT) and quality of service (QoS). Several techniques can be employed for acquiring the suitable figures of merit, ranging from highly intrusive receiver-based monitoring to non-intrusive optical probes independent from the modulation format [3], [4].…”

Section: Introductionmentioning

confidence: 99%

“…This approach also poses different challenges. In fact, the existing optical performance monitoring techniques are either valid for specific transmission technologies [3] (e.g. those based on polarization nulling are not suitable for polarization multiplexed signals) or exhibit a limited range of functions for extracting the figures of merit that will be employed to configure the different network resources, including the parameters of the transceivers [6].…”

Section: Introductionmentioning

confidence: 99%

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Optical Performance Monitoring Systems in Disaggregated Optical Networks

Fàbrega¹,

Moreolo²,

Nadal³

2018

2018 20th International Conference on Transparent Optical Networks (ICTON)

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In this paper, optical performance monitoring is presented as enabler to address the key challenges in disaggregated optical networks. In fact, data plane elements for non-intrusive monitoring of different modulation formats will be discussed, reviewing different options based on high resolution spectral analysis. Furthermore, we will report how the information retrieved by these monitoring probes can be used to actually control the transceivers and other data plane elements, emphasizing on the suitable figures of merit to be delivered to the SDN control, orchestration and management planes.

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“…Due to the PMD phenomenon waveforms of a transmitted signal can be distorted to an extent at which transmitted symbols cannot be retrieved with satisfactory low probability of error. A solution to PMD related limitations to optical communications can be an active management of fibers or wave-paths that is based on continuous in-work monitoring of at least the first order PMD in optical paths [1]. One particular method for monitoring PMD is based on learning parameters that describe the first order PMD, the differential group delay (DGD) and the power split factor between polarization modes, from distortions of the received waveform resulting from PMD.…”

Section: Introductionmentioning

confidence: 99%

Effect of Uncertain Reference Signal on Uncertainty of estimates of the First Order PMD in a Single Mode Optical Fibre

Lach

2016

ELECTROTECHNICAL REVIEW

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Joint probability density function of estimation errors of DGD and power split factor, the parameters defining the first order Polarization Mode Dispersion in an optical fibre, is formulated and used as a tool for investigation of influence of uncertainty of the reference signal, required by PMD measurement method, on uncertainty of the estimates. With the application of confidence intervals the uncertainty is evaluated through numerical analysis. Results can be applicable to PMD monitoring in optical fibre communications. Streszczenie. Sformułowano model łącznego rozkładu prawdopodobieństwa błędów estymacji DGD i współczynnika podziału mocy, parametrów opisujących dyspersję polaryzacyjną I rzędu w światłowodzie, który użyto jako narzędzia do zbadania wpływu niepewności sygnału referencyjnego, wymaganego przez metodę pomiaru PMD, na niepewność estymat. Z zastosowaniem przedziałów ufności niepewność estymat została oceniona metodą analizy numerycznej. Rezultaty mogą znaleźć zastosowanie w monitorowaniu PMD w komunikacji światłowodowej. (Wpływ niepewności sygnału referencyjnego na niepewność estymacji parametrów PMD I rzędu w światłowodzie jednomodowym).

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Advanced Optical Performance Monitoring for Next Generation Access Networks

Cited by 29 publications

References 11 publications

Adaptive Filtering in Optical Coherent Flexible Bit-Rate Receivers in the Presence of State-of-Polarization Transients and Colored Noise

Adaptive Filtering in Optical Coherent Flexible Bit-Rate Receivers in the Presence of State-of-Polarization Transients and Colored Noise

Optical Performance Monitoring Systems in Disaggregated Optical Networks

Effect of Uncertain Reference Signal on Uncertainty of estimates of the First Order PMD in a Single Mode Optical Fibre

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