Abstract
Reflection and Rayleigh backscattering-induced interferometric crosstalk
in a link employing a reflective semiconductor optical amplifier (RSOA) may
cause significant power penalty and, thus, limit the performance of the
system. In this paper, we investigate interferometric crosstalk suppression
in a centralized light generation wavelength division multiplexing-passive
optical network (WDM-PON) by single-tone phase modulation either by
utilizing the nonlinear behavior of the RSOA at the optical network unit
(ONU) or by applying an external phase modulator at the source side. 6- and
7-dB reduction in power penalty for reflection-induced crosstalk is
achieved, respectively. For Rayleigh backscattering-induced crosstalk power
penalty is improved with 3 and 4.5 dB, respectively. The results show that
an RSOA is very sensitive to reflections and backscattering and the
tolerance to these impairments can be significantly improved by appropriate
phase modulation. A comparison with advantages and disadvantages of both
methods together with final recommendation is also given in the
paper.
© 2009 IEEE
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