Abstract
Distributed and concentrated reflections represent the
two main limitations in reflective-semiconductor optical amplifier (R-SOA)-based
passive optical networks (PONs). In this paper, we experimentally discuss
how the use of chirped signals in centralized light seeding bidirectional
PON can increase the resilience of the system against those two types of reflections.
An experimental comparison of the performance of a highly chirped return to
zero (RZ) modulation format and the nonreturn to zero is given. Error-free
operation is achieved down to 10 dB of signal to crosstalk ratio in presence
of distributed reflection, when the upstream signal is highly chirped RZ signal.
The same chirped modulation leads to a tolerance of more than ${-}25$ dB network return loss due to
concentrated reflections. Finally, we assess also the system feasibility of
a R-SOA-based full-duplex PON where both the upstream and the downstream are
modulated signals.
© 2011 IEEE
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