Abstract
The optical fiber is used on the main parts of optical communication technique. However in recently, it is recognized that the optical fiber is having the characterizations for strain sensor. In this paper, the fundamental tests in related with the output properties for compression and tension of optical fiber were carried out and it is clarified that the relations between this output and strain of fiber is linear. Furthermore, the optical fiber is applied on the joint displacement measurement in rock mass slope. As the results, it is recognized that the displacement of joints can be measured high accuracy.
