Patent ID: 7113674
Filing Date: 2006-09-26
Classification: G02B

Abstract:
1. A method of manufacturing a fiber-type optical coupler, including the steps of: (a) forming, in an optical fiber having a core surrounded by a cladding, a first Bragg diffraction grating by periodic change of a refractive index whereby an angle θ made by a wave vector and an optical axis of said optical fiber is 0 degree <θ<90 degrees so as to form a first Bragg diffraction grating fiber; (b) removing said cladding, at one side, up to a boundary with said first Bragg diffraction grating; and (c) facing the cladding-removed side of said first Bragg diffraction grating fiber and the cladding-removed side of a second Bragg diffraction grating fiber which has the same configuration as said first Bragg diffraction grating fiber by making the respective optical axes almost parallel and also making slanting directions of the respective Bragg diffraction gratings almost parallel and also approximating surface planes of the removed claddings of said first and said second Bragg diffraction grating fibers.