Bragg reflection gratings in optical fibres
First Claim
1. A method of writing a chirped Bragg reflection grating in a photosensitive optical fiber, which grating is created by traversing a beam of electro-magnetic radiation along the fiber axis, which beam is incident upon the fiber through a diffraction grating located adjacent the fiber and oriented to have diffracting elements extending at an angle to the fiber axis, wherein the fiber is longitudinally tensioned by an amount that is varied during the writing therein of the grating.
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Accused Products
Abstract
Exposure to UV light of a photosensitive optical fiber through a uniform pitch phase grating is employed to write a chirped Bragg reflection grating in that fiber by imparting tensile strain to the fiber while sections of the Bragg reflection grating are sequentially written, and by altering the magnitude of that strain during the writing process.
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Citations
6 Claims
- 1. A method of writing a chirped Bragg reflection grating in a photosensitive optical fiber, which grating is created by traversing a beam of electro-magnetic radiation along the fiber axis, which beam is incident upon the fiber through a diffraction grating located adjacent the fiber and oriented to have diffracting elements extending at an angle to the fiber axis, wherein the fiber is longitudinally tensioned by an amount that is varied during the writing therein of the grating.
Specification