Abstract
In previous work, a technique was proposed for compensation of modal
dispersion in multimode fiber (MMF) systems by using adaptive optics. A
spatial light modulator (SLM), with amplitude and phase adjustable over
discrete blocks, was used to control the field launched into a MMF. The
system impulse response was found as a function of the SLM settings and the
field patterns of the MMF principal modes, which were assumed to be known.
Using principles of convex optimization, an optimal solution for the SLM
settings was obtained, which minimizes intersymbol interference (ISI)
subject to physical constraints. Here, we extend the previous method to
include control over launched polarization. We propose five adaptive optics
configurations, some permitting control only of overall polarization, and
others permitting block-wise polarization control. For each configuration,
we find optimal adaptive optics settings, which minimize ISI. We show that
the best performance is obtained by two configurations that permit
independent block-wise control of amplitude, phase and
polarization.
© 2010 IEEE
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