Abstract
We demonstrated a novel 20-Gb/s adaptively modulated optical
orthogonal frequency division multiplexed (AMO OFDM) transmission scheme with
separate in-phase (I) and quadrature (Q) channel baseband delivery over a
20-km single fiber link using remotely fed 1-GHz reflective semiconductor
optical amplifiers (RSOAs) for a colorless optical network unit (ONU). The
OFDM symbols with adaptive bit-/power-loading were applied to overcome the
bandwidth limitation of RSOAs and to optimize the performance. In order to
realize the baseband transmission without Hermitian symmetry, the I and Q
channel data streams in the OFDM symbols were separately transmitted by optical
carriers at two different wavelengths. Our proposed scheme was experimentally
validated using a periodic property of free spectral range (FSR) in a wavelength
multiplexer. The separate optical “dual” carriers were provided
by the same port of the wavelength multiplexer to avoid wasting the number
of wavelength division multiplexed channels.
© 2012 IEEE
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