Abstract
In aggregated 11.25 Gb/s over 25 km SSMF intensity-modulation and
direct-detection (IMDD) optical OFDM multiple access passive optical networks (OOFDMA
PONs) incorporating colorless ONUs based on reflective semiconductor optical amplifier
(RSOA) intensity modulators, excellent agreements are obtained between real-time
upstream experimental measurements and numerical simulations for various system
operating conditions. Making use of experimentally verified theoretical models and
component/system parameters, extensive numerical explorations are undertaken, for the
first time, of the impact of the number of ONUs on both upstream optical power budget
and minimum ONU wavelength spacing required for eliminating the optical beat
interference effect. It is shown that the minimum ONU wavelength spacing is independent
of the number of ONUs, and that doubling the number of ONUs simultaneously accommodated
in the aforementioned PON architectures gives a 1.9 dB reduction in upstream power
budget. Results also show that the utilization of an optimum frequency-offset
super-Gaussian optical filter at an order of 5 immediately after the RSOA intensity
modulator in each ONU can significantly improve the upstream power budget by >5.3
dB, and simultaneously enhance the upstream power budget robustness to variations in the
number of ONUs.
© 2013 IEEE
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