25 October 2004 PMD and chromatic dispersion compensation in a 1.76-terabit/s (44 x 43 Gbit/s) optical transmission experiment over 600-km SMF
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Abstract
A simple, adaptive PMD compensator is demonstrated in a 1.76Terabit/s (44 x 43 Gbit/s) transmission experi- ment over 600km SMF with a mean PMD of 8 ps. The PMDC is composed of a LiNbO3 polarization-controller followed by a component with an adjustable differential group delay (DGD) in the range of 0-20 ps. Feedback control is provided by means of continuously monitoring and maximizing the degree of polarization (DOP). This PMDC is shown to automatically compensate well for 1st-order (0-28 ps) and one part - the depolarization - of 2nd-order (0-130 ps2) PMD. Polarization dependent chromatic dispersion (PCD), being the other part of 2nd-order PMD, is negligible as long transmission systems without a PMDC are considered. But in fact PCD plays a role when an optical PMDC is introduced. Because of the anyway tight tolerance of 40 Gbit/s optical signals to chromatic dispersion, the variable dispersion compensator VIPA (virtually imaged phased array) with a tuning range of +/-800 ps/nm is introduced besides the PMDC. Therefore, with VIPA not only residual chro- matic dispersion put also PCD is e®ectively compensated for. Using adaptive optical technologies compensating for PMD and chromatic dispersion, error-free transmission (BER< 10¡15 with FEC, Q-margin=3 dB) of 44 x 43 Gbit/s (1.76 Tbit/s) over 600km of high PMD (8 ps) SMF is demonstrated.
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Jens C. Rasmussen, "PMD and chromatic dispersion compensation in a 1.76-terabit/s (44 x 43 Gbit/s) optical transmission experiment over 600-km SMF", Proc. SPIE 5596, Optical Transmission Systems and Equipment for WDM Networking III, (25 October 2004); doi: 10.1117/12.580440; https://doi.org/10.1117/12.580440
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