Abstract
The moment-generating function (MGF) of the received photoelectric current
is evaluated for a linear optical communication system consisting of
distributed amplified spontaneous emission (ASE), polarization-mode
dispersion (PMD), and polarization dependent loss (PDL). Using this
function, optical performance characterization based on the bit error rate
(BER), ${\rm Q}$-factor, and signal-to-noise ratio (SNR), can be evaluated. As an
example of the applicability to binary differential phase-shift keying
(DPSK) systems with defined PDL, the BER results predicted by linked model
and lumped model are compared. Our results indicate that the difference can
be orders of magnitude when the PDL is larger than 2.5 dB. Additionally,
random PDL induced statistical feature of the BER is entirely different for
these two models. Finally, relations between the statistical variations of
other performance parameters (${\rm Q}$-factor and SNR) and link model parameters (input signal
polarization, average PDL value, and link number $K$) are also investigated.
© 2009 IEEE
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