Patent ID: 6768839
Filing Date: 2004-07-27
Classification: G02B,G02F

Abstract:
A method for forming an optical fiber which comprises forming a hollow tubular cladding which comprises a first polymeric composition comprising a residual amount of a first actinic radiation polymerizable composition, said first polymeric composition having a first index of refraction, and said cladding having a longitudinal bore; filling the bore with a core of a second actinic radiation polymerizable composition through an open end of the hollow tubular cladding, and then partially polymerizing the second actinic radiation polymerizable composition to form a second polymeric composition which has a second index of refraction greater than the index of refraction of the first polymeric composition; simultaneously forming a Bragg grating having a plurality of spaced grating elements in the core and an additional Bragg grating having a plurality of spaced grating elements in the cladding which is congruent with the Bragg grating in the core by exposure of the first polymeric composition and the second polymeric composition to two beam interference pattern of ultraviolet radiation, or exposure to ultraviolet radiation through a phase mask; and positioning means for changing the spacing between the grating elements adjacent to the gratings.