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.
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics