Several direct constructions via skew starters and Weil's theorem on character sum estimates are given in this paper for optimal ðgv v; 5; 1Þ optical orthogonal codes (OOCs) where 60 g 180 satisfying g 0 ðmod 20Þ and v v is a product of primes greater than 5. These improve the known existence results on optimal OOCs. Especially, we provide an optimal ðv v; 5; 1Þ-OOC for any integer v
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