Abstract
This paper presents an enhanced security mechanism to protect spectral-amplitude-coding optical code-division
multiple-access networks against eavesdropping. This study proposes an alternative to huge code-space size
techniques such as wavelength hopping/time spreading or spectral-phase coding for network protection against
eavesdropping by exploiting the cyclic properties of arrayed-waveguide-grating routers and maximal-length sequence
code (M-sequence code). In addition, the network is protected
using a dynamic reconfigurable coding/decoding scheme based on optical switches and a dynamic code matrix assignment
scheme implemented using simple electrical shift registers. The signal-to-beat noise ratio is evaluated for various
data bit rates to provide an indication of the confidentiality of the power level for a specified bit error rate (P<sub>e</sub>≤10<sup>-9</sup>). To further verify the effectiveness of
the proposed scheme, this paper investigates a weighted load balance problem based on the power distribution of each
transmitted wavelength under various eavesdropping abilities. A dynamic codeword modification is proposed which
identifies the code matrix assignment that minimizes the degree of weighted load balance (DWLB). The evaluation
results show that the reconfiguration policy outperforms one class of static policies in terms of two performance
metrics, namely, the DWLB and the number of register shifts required to reconfigure the code matrix assignment.
© 2007 IEEE
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