Simultaneous with developing science and technology, increasing need to controller devices is felt more than before. Among these controller devices, those sensors preparing with optical fiber due to themselves advantages are very popular. In this study factor of distance in three main directions for an optical fiber sensor from 200 to 2700 micrometer has been studied and results was shown in two orders, microwatt and dBm. Accordingly, the maximum light reach to second fiber when two fibers be only fixed in a line (Z axis). Furthermore, increasing distance results in decreasing output power. In this paper the first stage of designing an optical fiber sensor which is increasing distance factor, has been performed and other dates will be published in future regarding the achievement.