Abstract
In this paper, the optimum design characteristics and the transmission
performance limits of an intensity modulation full-duplex bidirectional transmission
system at 10 Gb/s are experimentally studied and presented for application in
next-generation-extended wavelength-division-multiplexed passive optical networks. A
low-bandwidth (${\sim} {\hbox {1.2}}$ GHz) reflective semiconductor optical amplifier
(RSOA) is utilized at the optical network unit (ONU) site of the system. Its
remodulation properties and performance are examined for both continuous wave and
modulated downstream signal, stemming from the optical line terminal (OLT). The
techniques adopted to optimize performance are: 1)the use of detuned optical filtering
at the OLT receiver that takes advantage of the RSOA chirp and 2) the use of decision
feedback equalization (DFE). The extinction ratio of the downstream signal and the
driving operation point of the RSOA are examined experimentally in order to find the
optimum conditions for the bidirectional transmission. Moreover, the impact of
patterning effects in the performance of the system is evaluated. Finally, the
additional performance improvement that is achieved with the use of DFE technique is
shown.
© 2010 IEEE
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