Abstract
In this paper the performance and the capacity of two-level asynchronous incoherent optical
CDMA (OCDMA) systems employing wrapped overlapping pulse position modulation (WOPPM) and optical
AND logic gate receiver are analyzed. These analyses are performed by considering the multiple
access interference as the main limiting factor. Because of the power limitation in some laser
sources, the same-symbol-power scheme for all users is assumed. Optical orthogonal codes with the
same length are assigned to the users of each class. Considering the throughput as constraint, the
effects of the number of users in each class and the weight of low-weight users on the performance
of each class are examined and the results are compared with the same-mark-power case. Finally,
the effect of WOPPM signaling parameters such as overlapping index and total number of symbols on
the error probability of each class is investigated in the presence and in the absence of
throughput constraint. Our results show that when the multi-level technique is employed in WOPPM
OCDMA systems, one can find solutions for some design problems that cannot be handled by
conventional one-level methods. In addition to this benefit, employing this technique leads to a
less complex transceiver structure.
© 2013 IEEE
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