Temperature stable Bragg grating package with post tuning for accurate setting of centre frequency
First Claim
1. A method of tuning a Bragg grating that is embodied in an optical fiber and which comprises the steps of positioning the optical fiber within a metal, temperature compensating package with the grating-containing region of the fiber located between spaced-apart fiber anchoring points within the package;
- securing axially spaced portions of the fiber to the anchoring points without subjecting the—
package—
to tensile strain, and, thereafter, progressively elongating the package and the contained fiber to an extent sufficient to effect permanent plastic deformation of the package and to induce tensile strain in the grating region of the fiber and so tune the grating to a required center wavelength.
3 Assignments
0 Petitions
Accused Products
Abstract
A method of accurately setting the center wavelength of a fiber grating fixed in a temperature compensation package, the method comprising the steps of: fixing the grating to the package and altering the size of the package in a post processing step. The altering step can comprise elongating or compressing the package so as to substantially permanently alter the size of the package. The temperature compensation package can comprise: a first elongated member having a first coefficient of thermal expansion; two second elongated members, one each attached to the ends of the first elongated member and having their other second ends closer together than the ends of the first elongated member, the second elongated members having a second coefficient of thermal expansion relatively more than the first coefficient of thermal expansion; and two material matching members attached to the second ends and adapted to provide for material matching fixing mixtures to the second elongated members; the fixing mixtures to the second elongated members; the fixing mixtures fixing ends of the fiber grating to the temperature compensation package. The fixing mixture can comprise glass of metal solder. The material matching members are preferably located within an aperture in the second ends.
54 Citations
5 Claims
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1. A method of tuning a Bragg grating that is embodied in an optical fiber and which comprises the steps of positioning the optical fiber within a metal, temperature compensating package with the grating-containing region of the fiber located between spaced-apart fiber anchoring points within the package;
- securing axially spaced portions of the fiber to the anchoring points without subjecting the—
package—
to tensile strain, and, thereafter, progressively elongating the package and the contained fiber to an extent sufficient to effect permanent plastic deformation of the package and to induce tensile strain in the grating region of the fiber and so tune the grating to a required center wavelength. - View Dependent Claims (2, 3, 4, 5)
- securing axially spaced portions of the fiber to the anchoring points without subjecting the—
Specification