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IntroductionOptical access networks are important for developing an information infrastructure. When an optical fiber is first introduced, the demand generated varies greatly so an optical fiber cable extension method to address this is necessary. This paper uses the concept of fixed fiber and common fiber, both of which are usecl in the conventional method as the base, u , and proposes a new method to find the optimal extension amount to meet the large demand deviation. First, a method for determining the amount of common fiber extension that satisfies the required reliability with respect to the fixed-fiber extension is introduced. Next, a simulator to simulate the extension of both the fixed and common fiber is developed to determine the total cost for the various fixedfiber extension parameter. Using this procedure, an optimal amount of fixed-fiber and c o m n -f i b e r extension is found as parameters such as average demand and standard deviation. The proposed method is then shown to produce more economical planning than the conventional method.