OPTICAL FIBER, LIGHT AMPLIFIER, AND LIGHT SOURCE

摘要

A coated optical fiber which comprises a coating material covering the outer surface of an optical fiber and is capable of transmitting a high power light is characterized in that heating-up of the coating material caused by absorbing lights leaking out of the optical fiber is suppressed by using a transparent ultraviolet-curing resin as the coating material. A light transmission method is characterized in that a fiber fuse propagation threshold value, which is the minimum optical power necessary for propagation of a fiber fuse, is found and the power of the transmitted light is controlled so that it is smaller than the fiber fuse propagation threshold value.