PMD and PDL monitoring of traffic-carrying transatlantic fibre-optic system

We have made continual, multiple-day measurements of the polarization dependent loss of multiple C-band channels in an installed 1800 km terrestrial link. The PDLs of individual channels varied on the time-scale of hours, while the temporal variations of the PDLs of adjacent channels often tracked. The probability densities of the field measurements of PDL were not Maxwellian and instead were truncated, consistent with the limited number of elements in the link having appreciable PDL. A new model for the statistics of PDL in systems with few PDL elements is proposed, where a lower bound of the distribution exists if there is a dominant PDL element. The probability distributions from measurement and theory show good agreement.

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Simultaneous nominal and effective differential group delay in-service monitoring method for optical communications systems

Simoes¹,

Floridia²,

Franciscangelis³

et al. 2013

Opt. Express

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In this paper, we propose an in-service method to simultaneously monitor both nominal and effective values of differential group delay (DGD) in wavelength-division multiplexing (WDM) optical communication systems, in a per channel basis. The method is based on coherent heterodyne detection of the optical signal. We have demonstrated that the technique is capable to recover nominal DGD values from 0 ps to 90 ps while, at same time, to provide the effective DGD parameter, related to the impairment of optical channels. The relationship between the Q factor and effective DGD was also demonstrated, both numerically and experimentally, for distinct nominal values of DGD inserted on the system, by varying the state of polarization (SOP) of the optical signal at the input of the DGD element.

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PMD and PDL monitoring of traffic-carrying transatlantic fibre-optic system

Cited by 5 publications

References 5 publications

Field measurements of polarization transients on a long-haul terrestrial link

Field measurements of polarization transients on a long-haul terrestrial link

Statistics of polarization dependent loss in an installed long-haul WDM system

Simultaneous nominal and effective differential group delay in-service monitoring method for optical communications systems

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