Security evaluation of optical CDMA system with statistical approach

Optical orthogonal codes (OOC) have been investigated as an important technology to achieve optical CDMA systems. Recently, some security analyses were published, where they have a problem of weakness against eavesdropping. In this paper, we propose a new security measure for an optical CDMA system from the viewpoint of eavesdroppers. We derive distributions of code detection time by using a technique based on statistical approach, and evaluate robustness of the optical CDMA system using for several well-known OOCs.