Since multimode fiber has a much larger core than singlemode fiber and glass-clad materials are utilized for its manufacturing process, this kind of fiber shows less bending tolerance. Ideally, the minimum bend radius for multimode fiber should be about 30mm. Multi-mode links can be used for data rates up to 800 Gbit/s. Although the. Optical fiber is sensitive to stress, particularly bending. When stressed by bending, light in the outer part of the core is no longer guided in the core of the fiber so some is lost, coupled from the core into the cladding, creating a higher loss in the stressed section of the fiber.