• Title : "A Study of Cycle Attack by Multiple-Access Interference in malti-granularity OCDMA-based optical networks,"
• Author : S. Huang, K. Baba, M. Murata, and K. Kitayama,
• Journal : to appear in IEEE/OSA J. Lightwave Technol..
• Abstract: Previously, an optical code division multiplexing (OCDM)-based network architecture was proposed to improve the wavelength utilization and to provide finer bandwidth granularities to users. By this technology, different channels using distinct opti-cal codes (OCs) can be multiplexed onto the same wavelength by considering an OC as the basic unit in lightpath provisioning. In ideal case, multiple access interference (MAI) inherent to OCDM technology is assumed to be removed completely at intermediate nodes and cannot be propagated or accumulated along the lightpath. However, in transparent OCDM-based optical networks, as no optical-electrical (O/E) or electrical-optical (E/O) conversion is allowed, MAI noise cannot be removed completely at intermediate nodes@with all-optical regeneration technologies to date. As a result, it may propagate along the lightpath and furthermore attack (power leakage) other active lightpaths, or eventually cause network service disruption. In this paper, we first explain the MAI noise propagation mechanism and describe the cycle attack problem due to this propagation. A simple and intuitive approach based upon depth-first-search (DFS) algorithm is proposed to diagnose such cycle attacks under dynamic traffic conditions. Furthermore, we pro-pose to use a heuristic wavelength assignment scheme called advanced first-fit (AFF) to mitigate the blocking performance degradation due to cycle attacks. The numerical results show that our DFS-based cycle attack diagnostic algorithm enables to detect cycle attacks effectively, and AFF wavelength assignment scheme is capable of providing blocking performance very close to ideal case with some wavelength and OC configurations.
• Keywords :

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