Abstract

Adaptive optics is used to compensate for modal dispersion in digital transmission through multimode fiber (MMF). At the transmitter, a spatial light modulator (SLM) controls the launched field pattern. An estimate of intersymbol interference (ISI) caused by modal dispersion is formed at the receiver and fed back to the transmitter, where the SLM is adjusted to minimize ISI. Error-free transmission of $10\mathrm{Gbit}∕\mathrm{s}$ non-return-to-zero signals through standard $50\mu \mathrm{m}$ graded-index MMFs up to $11.1\mathrm{km}$ long is demonstrated. It is shown that a single SLM can compensate for modal dispersion across a $600\mathrm{GHz}$ bandwidth.

© 2005 Optical Society of America

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