A report is presented on the analysis and observation of periodic power oscillations caused by the combined effect of the polarisation-dependent loss and the periodic nature of the polarisation-evolution in optical fibre recirculating loops. The power oscillation is expected to affect the measure of the optical signal-to-noise ratio against distance. The effect is specific to recirculating loops and requires compensation to appropriately replicate the behaviour of long-haul transmission.
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Lizé et al. (2005) studied this question.
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