| 简介 |
The present invention relates to a method of manufacture of an optical loss filter, which is an optical component applicable to optical communications and related fields, comprising a long-period fiber grating to reduce the wavelength dependence of the gain of rare earth-doped fiber amplifiers in particular, as well as to an optical loss filter manufactured by this method. A method of manufacturing an optical loss filter of this invention is a method of manufacturing an optical loss filter in an optical waveguide having a core with a prescribed refractive index, comprising a first process in which first and second long-period gratings are formed in the axial direction of a core having the photosensitivity of the optical waveguide, providing a prescribed interval therebetween, and a second process in which the core between the first long-period grating and the second long-period grating is irradiated with ultraviolet light. In this method, because the amount of irradiation of the core with ultraviolet light can be changed continuously, by adjusting the amount of irradiation, an optical loss filter with a desired transmission characteristic can be obtained easily and with good precision. Also, the number of long-period gratings formed can be made small, so that manufacture in compact form is possible. |
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