Abstract
ThisPlease provide the IEEE membership details (membership grades
and years in which these were received), if any, for A. L. Sanches and
J. V. dos Reis, Jr. paper presents a comprehensive analysis of
an optical code-division multiple access (OCDMA) network based on two
distinct modulation formats, namely on–off keying (OOK) and
pulse-position modulation (PPM). We also investigate how each of these
modulation formats performs under two distinct 2-D coding schemes, i.e.,
single-pulse per row (SPR) and multiple-pulse per row (MPR). For both cases,
we have accounted for the simultaneous effect of many different dispersion
and noise mechanisms (including multiple access interference (MAI)] that
impair the overall system performance. We have included the laser relative
intensity noise at the transmitter side, the fiber dispersive effects (group
velocity dispersion (GVD), and first-order polarization-mode dispersion
(PMD)], and beat, avalanche photodiode (APD), and thermal noises at the
receiver side. The effect of GVD and PMD, as well as the influence of
noises, on the performance of SPR and MPR codes is also investigated.
Another effect studied in this paper is the influence of the APD
photodetector on the beat noise of an incoherent OCDMA network. To mitigate
systems noises and bit error rate (BER), we have adopted a forward error
correction (FEC) RS(255, 239) algorithm in both networks investigated here.
New expressions for the BER with all noises and dispersion mechanisms were
also derived for the SPR and MPR code schemes. Results indicated that OOK
and PPM modulation schemes without additional mechanisms to mitigate MAI and
other noise effects are not sufficient to accommodate 32 simultaneous users
in an error-free environment $({\rm BER} < 10^{- 12})$. This occurs due to the already high BER at the FEC input, which
severely affects FECs at the receiver side.
© 2009 IEEE
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