Abstract
This paper proposes a novel incoherent optical code-division multiple-access
(OCDMA) transceiver design, as a promising network access employing a newly
introduced prime code family named as double-padded modified prime code as
spreading sequences, based on the 2-D optical modulation scheme deploying
frequency and polarization shift keying. Hereafter, it is referred to as F-PolSK.
The novel F-PolSK-OCDMA system has been accurately analyzed taking into account
the presence of 1) optical amplified spontaneous emission noise; 2) electronic
receiver noise; 3) photo-diode shot-noise; and 4) multiple-access interference
(MAI). The application of the optical tapped-delay lines at the receiver as
a CDMA-decoder has also been investigated. The evaluation of 2-D array modulation
in conjunction with OCDMA indicates that the binary combination of this hybrid
scheme enhances the overall system performance. The results reveal that the
proposed architecture can easily accommodate greater number of users and consume
less power as compared with previous schemes. On the other hand, in polarization
modulation since the optical beam power is constant, the system has immunity
against the self- and cross-phase modulations. Besides, the system security
is much enhanced due to 2-D advanced modulation in optical domain.
© 2009 IEEE
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