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About 10,000 papers for “Optical performance monitoring”

Optical domain performance monitoring

R. Habel, Kim Roberts, A. Solheim et al. · 2002

The rapid evolution of terrestrial optical networks is driving the need for optical domain performance monitoring in order to provide the lowest transport cost per managed bit. This paper presents various techniques for monitoring optical signals between 3R interfaces in terms of their economic value to the network operator.

Cited by 20

From Optical Performance Monitoring to Optical Network

Lian-kuan Chen, Man-hong Cheung, Chun-kit Chan · 2004

Abstract: Optical performance monitoring (OPM) and optical network management (ONM) are essential in building a reliable, high-capacity, and service-differentiation enabled all-optical network. Early research efforts in OPM focused primarily on achieving the desired monitoring functionality. However, the slow commercial deployment of OPM suggests that several problems including cost-effectiveness and interactions with higher control layers have yet to be resolved. This paper first provides a broad review of some traditional OPM techniques, and then examines the recent trend of multiple-parameter simultaneous monitoring as a means to achieve more cost-effective OPM options. Finally, research efforts that relate OPM to high-layer ONM are reviewed. 1.

Cited by 0

Optical Labels Enabled Optical Network Performance Monitoring

Tao Yang · 2022

Optical performance monitoring (OPM) technology, especially the optical power and OSNR of each WDM channel, are of great importance and significance that need to be performed to ensure stable and efficient operation and maintenance of network itself. In this paper, we present our recent research activities and progresses on optical-label enabled OPM. Simulation results of WDM system show that the maximum error of channel power monitoring and OSNR estimation are less than 1dB after 20-span transmission. It confirms that the optical-label enabled OPM has lower cost and higher efficiency for mass deployment in practical WDM networks.

Cited by 0

Optical performance monitoring with tunable narrowband optical filtering

Dods, Sarah D., Hewitt, Don F., Farrell, Peter M. et al. · Figshare · 2005

We propose an optical performance monitoring scheme that combines a tunable narrowband optical filter with asynchronous histograms to create density plots that represent probability maps of both optical power and frequency. Simulations are used to investigate the technique, and show that measurements at transmitters and filters can directly detect optical chirp. The effects of several optical impairments are also shown, comprising misaligned filters in the optical path, dispersion, nonlinear effects and optical signal to noise ratio. The density plots are affected differently by each of these impairments.

Cited by 0Open access

Optical performance monitoring in optical packet-switched networks

Ruth Vilar · 2010

Para poder satisfacer la demanda de mayores anchos de banda y los requisitos de los nuevos servicios, se espera que se produzca una evolución de las redes ópticas hacia arquitecturas reconfigurables dinámicamente. Esta evolución subraya la importancia de ofrecer soluciones en la que la escalabilidad y la flexibilidad sean las principales directrices. De acuerdo a estas características, las redes ópticas de conmutación de paquetes (OPS) proporcionan altas capacidades de transmisión, eficiencia en ancho de banda y excelente flexibilidad, además de permitir el procesado de los paquetes directamente en la capa óptica. En este escenario, la solución all-optical label switching (AOLS) resuelve el cuello de botella impuesto por los nodos que realizan el procesado en el dominio eléctrico. A pesar de los progresos en el campo del networking óptico, las redes totalmente ópticas todavía se consideran una solución lejana . Por tanto, es importante desarrollar un escenario de migración factible y gradual desde las actuales redes ópticas basadas en la conmutación de circuitos (OCS). Uno de los objetivos de esta tesis se centra en la propuesta de escenarios de migración basados en redes híbridas que combinan diferentes tecnologías de conmutación. Además, se analiza la arquitectura de una red OPS compuesta de nodos que incorporan nuevas funcionalidades relacionadas con labores de monitorización y esquemas de recuperación.
\nLas redes ópticas permiten mejorar la transparencia de la red, pero a costa de aumentar la complejidad de las tareas de gesión. En este escenario, la monitorización óptica de prestaciones (OPM) surge como una tecnología capaz de facilitar la administración de las redes OPS, en las que cada paquete sigue su propia ruta en la red y sufre un diferente nivel de degradación al llegar a su destino. Aquí reside la importancia de OPM para garantizar los requisitos de calidad de cada paquete.

Cited by 0Open access

Optical performance monitoring with tunable narrowband optical filtering

Sarah D. Dods, Don Hewitt, Peter M. Farrell et al. · Optics Express · 2005

We propose an optical performance monitoring scheme that combines a tunable narrowband optical filter with asynchronous histograms to create density plots that represent probability maps of both optical power and frequency. Simulations are used to investigate the technique, and show that measurements at transmitters and filters can directly detect optical chirp. The effects of several optical impairments are also shown, comprising misaligned filters in the optical path, dispersion, nonlinear effects and optical signal to noise ratio. The density plots are affected differently by each of these impairments.

Cited by 4Open access

Optical performance monitoring in optical packet-switched networks

Vilar Mateo, Ruth · Tesis Doctorals en Xarxa (Consorci de Serveis Universitaris de Catalunya) · 2011

Para poder satisfacer la demanda de mayores anchos de banda y los requisitos de los nuevos servicios, se espera que se produzca una evolución de las redes ópticas hacia arquitecturas reconfigurables dinámicamente. Esta evolución subraya la importancia de ofrecer soluciones en la que la escalabilidad y la flexibilidad sean las principales directrices. De acuerdo a estas características, las redes ópticas de conmutación de paquetes (OPS) proporcionan altas capacidades de transmisión, eficiencia en ancho de banda y excelente flexibilidad, además de permitir el procesado de los paquetes directamente en la capa óptica. En este escenario, la solución all-optical label switching (AOLS) resuelve el cuello de botella impuesto por los nodos que realizan el procesado en el dominio eléctrico. A pesar de los progresos en el campo del networking óptico, las redes totalmente ópticas todavía se consideran una solución lejana . Por tanto, es importante desarrollar un escenario de migración factible y gradual desde las actuales redes ópticas basadas en la conmutación de circuitos (OCS). Uno de los objetivos de esta tesis se centra en la propuesta de escenarios de migración basados en redes híbridas que combinan diferentes tecnologías de conmutación. Además, se analiza la arquitectura de una red OPS compuesta de nodos que incorporan nuevas funcionalidades relacionadas con labores de monitorización y esquemas de recuperación.\nLas redes ópticas permiten mejorar la transparencia de la red, pero a costa de aumentar la complejidad de las tareas de gesión. En este escenario, la monitorización óptica de prestaciones (OPM) surge como una tecnología capaz de facilitar la administración de las redes OPS, en las que cada paquete sigue su propia ruta en la red y sufre un diferente nivel de degradación al llegar a su destino. Aquí reside la importancia de OPM para garantizar los requisitos de calidad de cada paquete.

Cited by 0

Optical performance monitoring with tunable narrowband optical filtering

Dods, Sarah D., Hewitt, Don F., Farrell, Peter M. et al. · Figshare · 2005

We propose an optical performance monitoring scheme that combines a tunable narrowband optical filter with asynchronous histograms to create density plots that represent probability maps of both optical power and frequency. Simulations are used to investigate the technique, and show that measurements at transmitters and filters can directly detect optical chirp. The effects of several optical impairments are also shown, comprising misaligned filters in the optical path, dispersion, nonlinear effects and optical signal to noise ratio. The density plots are affected differently by each of these impairments.

Cited by 0Open access

Performance Monitoring for Optical Transport Network

Wei Yi · 2004

The traditional performance monitoring sche- mes of Optical Transport Network (OTN) is proposed first. Two concepts, intrusive monitoring and non- intrusive monitoring, are introduced. In service perfor- mance monitoring schemes based on optical analog symbol analysis are discussed deliberately.

Cited by 0

Asynchronous Sampling for Optical Performance Monitoring

Sarah D. Dods, Trevor Anderson, Ken Clarke et al. · 2007

We present two novel performance monitoring techniques for optically switched networks, based on asynchronous multi-tap sampling. We show that multiple simultaneous impairments can be separated and quantified by a single monitor.

Cited by 26

Optical performance monitoring in short reach optical communication systems

Xie, Yapeng · Figshare · 2023

With the development of advanced optical communication systems and networks, the critical role of optical performance monitoring (OPM) in system and network operation has emerged. OPM can help service operators to provide users with guaranteed signal transmission, and it can be conducted from both optical domain and electrical domain. In short-reach communication systems, intensity modulation/direct detection (IM/DD) is typically used, and channel parameters such as optical signal-to-noise ratio (OSNR) and chromatic dispersion (CD) are concerned by system management. In high-speed optical fiber communications, CD estimation is essential for the monitoring and compensation of CD-induced impairments. The existing dispersion estimation techniques usually require training signals or a large amount of data for curve fitting or machine learning. However, these methods cannot provide in-service estimation. In addition, compared with electronic monitoring, optical domain OPM has shown competitive advantages because it does not require opto-electronic conversion and can be detected from each node of the system without interrupting the normal operation. OSNR is a widely used optical performance indicator since it suggests the impairments of the system. However, OSNR cannot reflect the performance of systems as accurate as the bit error rate (BER). Therefore, the objective of this research is to establish a theoretical framework of dispersion, OSNR and SNR/BER analysis for short-reach optical communication systems, considering different types of impairments and limitations. The key questions to answer are the theoretical modelling of dispersion, OSNR and the nonlinear relationship between OSNR and SNR/BER, to provide an easily interpretable optical performance monitoring parameter for short-reach optical communication systems and networks. In this thesis, we first developed a novel technique for in-service CD estimation for IM/DD channel with the random input signal using power spectrum analysis. In addition, we proposed a complete and accurate analytical model which was verified with numerical simulations. Unlike previous studies that only work with single-frequency sinusoidal signals, the practical random data is considered in our model. Therefore, our method can be applied to the dispersion estimation of various pulse amplitude modulation (PAM) based systems. results show that better than 0.5% error rate in dispersion estimation can be achieved in optical communication systems with up to 40 GBaud data rate and 100 km transmission distance. In addition, for the modelling of OSNR and SNR monitoring, a theoretical framework for OSNR and SNR/BER analysis in IM/DD based short-reach optical communication systems under various limitations is developed. The theoretical model is based on power spectrum analysis and can link OSNR with SNR/BER for accurate data transmission quality estimation. Different from previous models, which only apply to amplified spontaneous emission (ASE) noise limited systems, our model can be applied to non-ASE limited IM/DD systems. The proposed analytical model is verified and investigated via numerical simulations, where results show a maximum 0.3% error rate. The work above can be applied in static IM/DD systems for accurate data transmission quality estimation, where the dispersion is assumed to be fully compensated. However, in dynamic short-reach optical communication networks with reconfigurable network topologies, CD is difficult to be fully compensated and it affects the SNR performance as well. One example is the elastic optical networks (EON), where both the wavelength and the transmission distance change dynamically, causing varying dispersion at the receiver side. Therefore, we further proposed a theoretical framework of OSNR and SNR/BER analysis for IM/DD modulated optical communication systems with fibre dispersion. Results consistently match the predictions of the system simulation, with a maximum estimation error rate 1.5%.

Cited by 0Open access

Optical performance monitoring (OPM) in next-generation optical networks

R.E. Neuhauser · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2002

DWDM transmission is the enabling technology currently pushing the transmission bandwidths in core networks towards the multi-Tb/s regime with unregenerated transmission distances of several thousand km. Such systems represent the basic platform for transparent DWDM networks enabling both the transport of client signals with different data formats and bit rates (e.g. SDH/SONET, IP over WDM, Gigabit Ethernet, etc.) and dynamic provisioning of optical wavelength channels. Optical Performance Monitoring (OPM) will be one of the key elements for providing the capabilities of link set-up/control, fault localization, protection/restoration and path supervisioning for stable network operation becoming the major differentiator in next-generation networks. Currently, signal quality is usually characterized by DWDM power levels, spectrum-interpolated Optical Signal-to-Noise-Ratio (OSNR), and channel wavelengths. On the other hand there is urgent need for new OPM technologies and strategies providing solutions for in-channel OSNR, signal quality measurement, fault localization and fault identification. Innovative research and product activities include polarization nulling, electrical and optical amplitude sampling, BER estimation, electrical spectrum analysis, and pilot tone technologies. This presentation focuses on reviewing the requirements and solution concepts in current and next-generation networks with respect to Optical Performance Monitoring.

Cited by 2

Optical Performance Monitoring and Signal Optimization in Optical Networks

Martin Nordal Petersen, Lars Dittmann, Christophe Peucheret et al. · Technical University of Denmark, DTU Orbit (Technical University of Denmark, DTU) · 2006

This thesis studies performance monitoring for the next generation optical networks.The focus is on all-optical networks with bit-rates of 10 Gb/s or above.Next generation all-optical networks offer large challenges as the optical transmitted distance increases and the occurrence of optical-electrical-optical regeneration points decreases.This thesis evaluates the impact of signal degrading effects that are becoming of increasing concern in all-optical high-speed networks due to all-optical switching and higher bit-rates.Especially group-velocity-dispersion (GVD) and a number of nonlinear effects will require enhanced attention to avoid signal degradations.The requirements for optical performance monitoring features are discussed, and the thesis evaluates the advantages and necessity of increasing the level of performance monitoring parameters in the physical layer.In particular, a method for optical-signal-to-noise-ratio (OSNR) monitoring is proposed, which allows for improvements in dense WDM systems in terms of OSNR evaluation accuracy as well as increased signal performance.A GVD monitoring technique is likewise described and experimentally demonstrated in 40 GB/s return-to-zero (RZ) and non-return-to-zero (NRZ) systems.Two techniques for signal quality monitoring are proposed.One method exploits a lower frequency reference signal to monitor signal degradations in a 40 Gb/s noise limited system.In a second method, an integrated all-optical bitparity calculator is demonstrated using 10 Gb/s RZ data.The parity-calculator was realized using an all-active integrated SOA-based Mach Zehnder interferometer.A method for signal quality optimization is proposed and demonstrated through both laboratory and field trial experiments.Signal quality optimization and signal quality monitoring was achieved using a subcarrier tone added to the 10 Gb/s NRZ data.Through launch power tuning to several spans, the signal quality could be successfully optimized.Finally, the thesis presents two field trial demonstrations of Ethernet-overfiber (EoF) transmissions.The all-optical transmission of 525 km though Deni mark as well as a large scale GRID computing experiment concluded EoF an attractive alternative to SDH/SONET for cost-effective data transmission networks.ii A great thanks goes to my supervisor Lars Dittmann for providing me with the opportunity to work and study here at the Research Center COM for the past years as a Ph.D. student.Not to forget all the people in the Networks Group; No doubt, it has been a great experience, both in terms of professional life and social life.Acknowledgements and thank-you goes to my co-supervisors Christophe Peucheret and Mads Lnstrup Nielsen.With patience Christophe always had time for helpful talks, and Mads for invaluable advice and endless discussions about research as well as other topics.Experiments in the lab went

Cited by 0Open access

Optical Labels Enabled Optical Performance Monitoring in WDM Systems

Tao Yang, Kaixuan Li, Zhengyu Liu et al. · Photonics · 2022

Optical performance monitoring (OPM), particularly the optical power and optical signal-to-noise ratio (OSNR) of each wavelength channel, are of great importance and significance and need to be implemented to ensure stable and efficient operation/maintenance of wavelength division multiplexing (WDM) networks. However, the critical monitoring module of existing solutions generally are too expensive, operationally inconvenient and/or functionally limited to apply over WDM systems with numerous nodes. In this paper, a low-cost and high-efficiency OPM scheme based on differential phase shift keying (DPSK)-modulated digital optical labels is proposed and demonstrated. Each pilot tone is modulated by digital surveillance information and treated as an identity indicator and performance predictor that ties up to each wavelength channel and thereby can monitor the performance of all wavelength channels simultaneously by only one low-bandwidth photoelectric detector (PD) and by designed digital signal processing (DSP) algorithms. Simulation results showed that the maximum errors of channel power monitoring and OSNR estimation were both less than 1 dB after 20-span WDM transmission. In addition, offline experiments were also carried out and further verified the feasibility of our OPM scheme. This confirms that the optical label based OPM has lower cost and higher efficiency and thereby is of great potential for mass deployment in practical WDM systems.

Cited by 7Open access

Optical Performance Monitoring in DSP-based Coherent Optical Systems

Zhenhua Dong, Qi Sui, Alan Pak Tao Lau et al. · Optical Fiber Communication Conference · 2015

We review the requirements for optical performance monitoring in high capacity DSP based coherent optical transmission systems. Recent proposed schemes for OSNR and CD monitoring for coherent systems are summarized.

Cited by 11