| 摘要 |
Disclosed is a method for producing a chirped in-fiber Bragg grating, in which an interval between gratings varies continuously depending on a location of the gratings observed along an optical fiber, comprising a first step of winding the optical fiber in a spiral groove formed around a conical bobbin which is shaped in a frustum of a right circular cone having a predetermined vertex angle and a height between predetermined first and second diameters, and a second step of irradiating the optical fiber wound on the conical bobbin with ultraviolet rays at every crossing of the optical fiber with a predetermined number of uniformly distributed generating lines of the conical bobbin, each extending radially on the surface of the conical bobbin from an imaginary vertex thereof, for modifying the refractive index of a core of the optical fiber to form the grating at the every crossing.
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