Abstract
The optical gain of reflective optical network units (ONUs) may produce
a critical amplifying feedback on the single-fiber transmission impairments.
In this paper, its influence on the passive optical networks transmission
with reflective-ONU is theoretically analyzed and experimentally confirmed.
Analytical expressions for the optical crosstalk-to-signal ratio and the $Q$-parameter in presence of Rayleigh backscattering,
reflection interferences and ASE noise are given. As a resulting design guideline,
the ONU gain should be adjusted to about 3 dB below the total link loss; in
addition, component return loss at the drop section must be higher than 30
dB. Experimental results with two basic types of reflective-ONUs, namely a
loop structure formed by a Mach–Zehnder modulator and an optical amplifier,
and another one employing a reflective-SOA, are in agreement with the theoretical
approach.
© 2009 IEEE
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