Abstract
Four direct constructions, three of which are by way of skew starters, are given in this correspondence for optimal (/spl upsi/, 4, 1) optical orthogonal codes (OOC's). These improve the known existence results concerning optimal (/spl upsi/, 4, 1)-OOCs. In particular, it is shown that an optimal (/spl upsi/, 4, 1)-OOC exists for all positive integers /spl upsi//spl equiv/6 (mod 12) or /spl upsi//spl equiv/24 (mod 48). It is also shown that an optimal (12/spl upsi/, 4, 1)-OOC exists for any positive integer /spl upsi/ whose prime factors are all congruent to 1 modulo 4.
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