Abstract
We propose a novel technique to increase the confidentiality of an optical
code division multiple access (OCDMA) system. A virtual user technique is analyzed
and implemented to make an OCDMA system secure. Using this technique, an
eavesdropper will never find an isolated authorized user's signal. When authorized
users and virtual users transmit data synchronously and asynchronously, network
security increases by 25% and 37.5%, respectively.
© 2011 Chinese Optics Letters
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