Abstract
To reuse the downstream carrier for upstream transmission, a data eraser is
mandatory for bleaching the downstream data in the dense wavelength division
multiplexing passive optical networks (DWDM-PONs). In this paper, a self-feedback
semiconductor optical amplifier (SOA) fiber loop operated at power saturation condition
is employed as a data-amplitude clipper, which helps to erase the downstream
pseudorandom binary sequence (PRBS) data carried by the downstream channelized broadband
light source. The self-feedback SOA fiber loop can adjust its feedback coupling ratio to
offset the in-line amplified spontaneous emission power level; hence, the
continuous-wave biased point of the input optical power can be adjusted prior to the
input of the SOA. The self-feedback architecture efficiently clips the downstream data
amplitude to significantly reduce the extinction ratio of data on carrier from 13 to 1.6
dB. Afterward, the data-erased downstream carrier is reused to successfully carry the
upstream ON–OFF-keying PRBS data at 2.5 Gbit/s in a 200 GHz channelized bidirectional
DWDM-PON. The downstream carrier reused for upstream transmission can provide a
back-to-back receiving power sensitivity of -24 dBm at BER of 10<sup>-9</sup>. The
carrier reused upstream transmission induces a power penalty of -6 dB as compared to
the downstream case. After transmission in a 25-km long single-mode fiber, the reused
upstream transmission further degrades its receiving power sensitivity to -22 dBm
with additional penalty of 2 dB.
© 2012 IEEE
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