OPTICAL FIBER HAVING DIFFRACTIVE OPTICAL FILM ON END AND METHOD FOR MANUFACTURING SAME

摘要

An optical fiber having a practical, small diffractive optical film on an end is efficiently manufactured at low cost. A diffractive optical film (DF) is formed on an end face of an optical fiber (F) or on an end face of a collimator joined to the end face of the optical fiber. The diffractive optical film (DF) comprises a translucent DLC (diamond-like carbon) layer, and this translucent DLC layer includes a modulated refractive-index diffraction grating having a local region of a relatively high refractive index and another local region of a relatively low refractive index.