Abstract
To circumvent the challenging issue of Rayleigh noise
reduction in wavelength-division-multiplexed passive optical network (WDM-PON),
we provide an insight into the source of Rayleigh noise, and confirm that
the suppression of carrier Rayleigh backscattering (RB) should be the primary
target in the design of Rayleigh noise-resilient upstream receiver module
for a transmission reach up to 60 km. Then we propose and demonstrate a novel
scheme to effectively suppress the carrier RB in carrier-distributed WDM-PONs.
By simply replacing the upstream modulation format of conventional on-off
keying (OOK) with differential phase-shift keying (DPSK), the system tolerance
to carrier RB is substantially enhanced by 19 dB, as the carrier RB can be
considerably rejected by the notch filter-like destructive port of the delay-interferometer
(DI) at the optical line terminal (OLT), which is used simultaneously to demodulate
the upstream DPSK signal. The dependence of carrier RB suppression on DI's
extinction ratio (ER) and optical carrier's line width is also theoretically
analyzed. Experimental demonstration of 10-Gb/s upstream signal is achieved
with less than 2.5-dB power penalty induced by Rayleigh noise after the transmission
in 60-km single mode fiber, without using any amplifier in outside plant.
The relation between system margin and the gain of optical network unit (ONU)
is also studied.
© 2011 IEEE
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription