Abstract
We experimentally compare various adaptive algorithms that use a spatial light modulator
(SLM) to compensate modal dispersion in 50-$\mu$m graded-index multimode fibers. We show that continuous-phase sequential coordinate
ascent (CPSCA) gives better bit-error-ratio performance than 2- or 4-phase sequential
coordinate ascent, in concordance with simulations in . We then evaluate the bandwidth characteristics of CPSCA, and show that a single
SLM is able to simultaneously compensate the modal dispersion in up to 9
wavelength-division-multiplexed 10-Gb/s channels, spaced by 50 GHz, over a total bandwidth of
450GHz. We also show that CPSCA is able to compensate for modal
dispersion in fibers up to 2.2 km long, even in the presence of midspan connector offsets up
to 4 $\mu$m (simulated in experiment by offset splices). A known non-adaptive launching
technique using a fusion-spliced single-mode-to-multimode patchcord is shown to fail under
these conditions.
© 2009 IEEE
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