Abstract
With cascaded and multisection Sagnac interferometers, all-optical fast
Fourier transform (FFT) has been demonstrated for optical demultiplexing (DEMUX)
of orthogonal frequency division multiplexing (OFDM) signals. The transmission
characteristics of the interferometers have been investigated theoretically
and experimentally. The scalability and tunability of the all-optical OFDM
DEMUX are analyzed and demonstrated for 5-channel OFDM signals.
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