Abstract
We demonstrate a cost-effective, 10-Gb/s full-duplex wavelength-division-multiplexed
passive optical network over 20 km single-feeder fiber using a single light
source per optical network unit (ONU). We exploit a directly modulated laser
(DML) and a reflective semiconductor optical amplifier (RSOA) for downlink
and uplink, respectively. In this system, a nonreturn-to-zero (NRZ) downstream
signal is first frequency up-converted to around 20 GHz before being fed to
a DML for downstream transmission. After transmission over the feeder fiber,
a portion of the downstream signal is detected at the ONU and the other portion
is fed to the RSOA as seed light. The RSOA is directly modulated by a 10-Gb/s
NRZ signal for upstream transmission. To overcome the bandwidth limitation
of the directly modulated RSOA, we employ an optical delay interferometer
at the upstream receiver. The passive optical device acts as an optical equalizer
and enables the 10-Gb/s upstream signal to be accommodated with a 1.3-GHz-bandwith
RSOA. We investigate through experiment the crosstalk between the downstream
and upstream signals as a function of the downstream subcarrier frequency.
Also investigated in this paper is the nonlinear frequency mixing of the downstream
and upstream signals in the RSOA.
© 2012 IEEE
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