Patent ID: 6093927
Filing Date: 2000-07-25
Classification: G02B

Abstract:
An apparatus for writing fiber optic Bragg gratings over a range of Bragg wavelengths, said apparatus comprising:a laser for generating an ultraviolet beam;a prism disposed downstream of said laser such that said beam is incident on a hypotenuse of said prism;a cylindrical lens interposed between said laser and said prism for aligning a line focus of said beam parallel with said hypotenuse of said prism;a rotation stage coupled to said prism for rotating said prism about a pre-selected pivot point relative to an angle of incidence of said beam to vary said Bragg wavelength within said range; andan optical fiber disposed adjacent a bottom edge of said prism for receiving a high fringe frequency interferrogram formed by said prism from said beam on a core portion thereof, said high fringe frequency interferrogram writing said Bragg grating thereon.