22 January 2010 In-service characterization of optical links and signals with respect to PMD
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Tackling PMD has turned out to be one of the most puzzling problems during the advent of high speed optical transmission systems. It still seems far more attractive to avoid links with high PMD than to install an expensive PMDcompensator. Measuring the PMD of an installed fiber link can answer the question if this link can be operated with or without a PMD-compensator. Common test methods require exclusive access to the fiber link. This is considered to be a major limitation since it is not easy to reroute the traffic of a WDM system with many channels. This contribution discusses techniques to measure the PMD of a fiber link while it is in service ("In-Situ PMD Measurement"). These approaches can be applied to a single channel as well as to the whole received WDM signal and the fact that only single end access is needed makes them appear quite attractive. However, there are principal limitations which need to be understood in order to qualify a link. Performing these measurements while the link is in service will help network operators to smoothly upgrade to higher bit rates in their backbone networks.
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Harald Rosenfeldt, Harald Rosenfeldt, Dieter Werner, Dieter Werner, } "In-service characterization of optical links and signals with respect to PMD", Proc. SPIE 7621, Optical Metro Networks and Short-Haul Systems II, 762108 (22 January 2010); doi: 10.1117/12.846357; https://doi.org/10.1117/12.846357

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