Discussion on method of construction of big capacity OCDMA address code: Construction of (F, K, 1, 2) optical orthogonal codes from block design

Construction of address code is one of the key techniques in optical code division multiple access (OCDMA) system. Aiming at the fact that (F, K, 1) optical orthogonal code (OOC) possesses good performance but capacity is small, and it can´t meet the demands of all-optical networks. Although the capacity of (F, K, 2) OOC is significantly increased compared with (F, K, 1) OOC, system synchronization will be weaker than (F, K, 1) OOC. So, (F, K, 1, 2) OOC possesses big capacity and holds good synchronization. In this paper, the method of constructing big capacity (F, K, 1, 2) OOC based on block design is discussed. The algorithm of construction of OOC from block design is presented. The auto-correlation and cross-correlation restricts are set strictly. The algorithm is simulated; several groups of (F, K, 1, 2) OOC are gained. The results show that the algorithm has good astringency and simplicity. It can construct (F, K, 1, 2) OOC effectively. It is feasible.