Abstract
A scheme for the mitigation of Rayleigh backscattering (RB) in hybrid
passive optical networks (PON) is presented. Semiconductor optical
amplifiers (SOA) of the optical network units (ONU) are advantageously used
as nonlinear elements, exploiting Four-Wave Mixing (FWM) between the
downstream signals to create a spectrally displaced optical upstream
carrier. The proposed technique is experimentally proven in a long reach and
high split PON, and the suppression of the pumps and further FWM products,
obtained via a modified filtering scheme inside the PON, is analyzed.
Full-duplex transmission at 10/2.5 Gb/s is demonstrated, showing that
upstream transmission is possible despite low optical signal-to-RB ratios
(OSRR) of ~12 dB.
© 2010 IEEE
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