Embedded OTDR techniques for cost-efficient fibre monitoring in optical access networks

Schmuck, H.; Hehmann, J.; Straub, Michael; Pfeiffer, Th.

doi:10.1109/ecoc.2006.4800887

Cited by 40 publications

(26 citation statements)

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“…The wireless link offers a full protection to selected customers by providing a disjoint protection path in case of a drop and/or distribution fibre cut. It also allows reporting of ONU side optical time domain reflectometer (OTDR) measurements (if implemented) [26] to the operation and maintenance systems for detecting the location of fibre faults. This can reduce the mean time to repair (MTTR) and thus the overall access network availability is enhanced.…”

Section: Reliability Considerationsmentioning

confidence: 99%

Access and Metro Network Convergence for Flexible End-to-End Network Design [Invited]

Ruffini¹,

Achouche

Arbeláez

et al. 2017

J. Opt. Commun. Netw.

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Abstract-This paper reports on the architectural, protocol, physical layer and integrated testbed demonstrations carried out by the DISCUS FP7 consortium in the area of accessmetro network convergence. Our architecture modelling results show the vast potential for cost and power savings that node consolidation can bring. The architecture however also recognises the limitations of long-reach transmission for low latency 5G services, and proposes how to address such shortcomings in future projects. The testbed results, which have been conducted end-to-end, across access-metro and core, and have targeted all the layers of the network, from the application down to the physical layer, show the practical feasibility of the concepts proposed in the project.Index Terms-access metro, network convergence, fixed mobile convergence, long-reach PON, flat optical core, optical island, 5G architecture, next generation multi wavelength PON.

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Section: Reliability Considerationsmentioning

confidence: 99%

Access and Metro Network Convergence for Flexible End-to-End Network Design [Invited]

Ruffini¹,

Achouche

Arbeláez

et al. 2017

J. Opt. Commun. Netw.

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“…OLT OTDR data however suffer from reduced sensitivity due to high splitting losses and from ambiguous diagnosis of fiber link failure due to the superposition of OTDR traces originating from different fiber branches. A recent idea about low-cost embedded OTDR suitable for ONU monitoring reuses the LD and laser driver which are present at the fiber endpoint for data transmission [1]. This approach can reduce the cost to a certain extent because no dedicated OTDR laser and driver are needed, but an additional coupler and photodetector are still needed.…”

Section: Introductionmentioning

confidence: 99%

A Novel Technique for Low-Cost Embedded Non-intrusive Fiber Monitoring of P2MP Optical Access Networks

Chen

Mulder

Vandewege

et al. 2007

OFC/NFOEC 2007 - 2007 Conference on Optical Fiber Communication and the National Fiber Optic Engineers Conference

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“…Moreover, the cost of the embedded OTDR unit must be low. A recent idea for passive optical-access networks (PON) is the embedded OTDR unit that reuses the laser driver and laser diode that are present at the fiber endpoint for data transmission [6], [7]. This is a good approach, as the measurement will show the attenuation in function of distance at the correct wavelength.…”

Section: Introductionmentioning

confidence: 99%

“…1 also presents three nonconventional low-cost methods to acquire optical echoes caused by the OTDR excitation. The first approach uses a 10/90 optic coupler instead of a conventional 50/50 splitter to separate reflections from transmitted light [6], [7], but this approach requires additional dedicated optics and reduces the link budget. In case the laser module contains no isolator, the echo can also be detected by using the laser diode as a photodetector [11], [12].…”

Section: Introductionmentioning

confidence: 99%

Nonintrusive Fiber Monitoring of TDM Optical Networks

Mulder

Chen

Bauwelinck

et al. 2007

J. Lightwave Technol.

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Abstract-This paper introduces a new embedded nonintrusive fiber-monitoring technique for time-division-multiplexing optical networks. It allows an optical transmitter to characterize the fiber plant from reflections caused by data bursts transmitted across the network instead of dedicated test signals. The probing is performed with minimal burden on data traffic so that many measurements can be averaged to improve accuracy. The method is very suitable for embedded optical time-domain reflectometers (OTDR), which reuse a network node's optical data transmitter for OTDR excitations and embed a reflectometer inside the fiber endpoint. This paper models the OTDR with Laplace transforms, an approach previously unpursued, after which it is explained how reflections from multiple data bursts with arbitrary width can be converted into one normalized format. This new class of OTDR excites the fiber with a negative step of light instead of the conventional short pulse. The signal-to-noise ratio (SNR) for backscatter and Fresnel reflections caused by the negative step and pulse are compared theoretically. It is shown that negative-step OTDR breaks the tradeoff between excitation pulsewidth and distance resolution, has a natural separation between fiber backscatter and Fresnel reflectors, and improves the SNR of nonreflective events.

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Embedded OTDR techniques for cost-efficient fibre monitoring in optical access networks

Cited by 40 publications

References 0 publications

Access and Metro Network Convergence for Flexible End-to-End Network Design [Invited]

Access and Metro Network Convergence for Flexible End-to-End Network Design [Invited]

A Novel Technique for Low-Cost Embedded Non-intrusive Fiber Monitoring of P2MP Optical Access Networks

Nonintrusive Fiber Monitoring of TDM Optical Networks

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