Abstract
In this paper, we propose and investigate a ring-based wavelength-division-multiplexing
passive optical network (WDM-PON) providing both Rayleigh backscattering (RB)
noise mitigation and fiber-fault protection. The proposed ring-based WDM-PON
has a dual-ring architecture to protect and restore any fiber fault. Besides,
the ring architecture also can mitigate the RB beat noise, since the RB and
the upstream wavelengths are propagating in opposite directions. Here, we
discuss and analyze the characteristics of the downstream signals using 10
Gb/s ON–OFF keying (OOK), 10 Gb/s differential phase-shift keying, and
10 Gb/s orthogonal frequency-division multiplexing (OFDM) modulations, respectively.
Moreover, we also investigate the upstream traffic using the 2.5 Gb/s OOK
and 10 Gb/s OFDM generated by the directly modulated reflective semiconductor
optical amplifier-based optical network unit, respectively.
© 2012 IEEE
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