Abstract
A procedure for the μltiplexing and deμltiplexing of modes in optical fibers
with digital holograms is presented. By using a spatial light modulator (SLM) to encode
a digital hologram, the desired complex field is shaped and injected into the fiber. The
SLM's ability to rapidly refresh the encoded transmission function enables one to excite
pure single modes, as well as arbitrary coherent mode superpositions, in real-time. The
modes from the output of the fiber are subsequently deμltipexed by applying a
correlation filter for modal decomposition, thus allowing for an all-digital-hologram
approach to modal analysis of fibers. The working principle is tested using conventional
step-index large mode area fibers being excited with higher-order single modes and
superpositions.
© 2013 IEEE
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