Variable optical fiber Bragg filter arrangement
First Claim
1. A variable light filtering arrangement comprisingat least one optical fiber section including a waveguiding core;
- at least one permanent Bragg grating region in said optical fiber section, including a plurality of grating elements constituted by periodic refractive index variations of a predetermined initial periodicity and cumulatively redirecting, of the light launched into said core for guided propagation therein, that having an axial wavelength within a narrow band around a central wavelength that is determined by the periodicity and refractive index variations of said grating elements; and
means for so applying at least to said grating region of said optical fiber section an external influence that is representative of a parameter other than structural strain as to modify at least one of the periodicity and refractive index variations of said grating region with an attendant change in said central wavelength within a predetermined wavelength range to an extent indicative of the magnitude of said parameter.
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Accused Products
Abstract
A variable light filtering arrangement includes at least one optical fiber section including a waveguiding core, and at least one permanent Bragg grating region in the optical fiber section. The grating region includes a plurality of grating elements constituted by periodic refractive index variations of a predetermined initial periodicity and cumulatively redirecting, of the light launched into the core for guided propagation therein, that having an axial wavelength within a narrow band around a central wavelength that is determined by the periodicity and refractive index variations of the grating elements. At least one of the periodicity and refractive index variations of the grating region is controlledly modified in such a manner as to temporarily change the central wavelength within a predetermined wavelength range.
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Citations
20 Claims
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1. A variable light filtering arrangement comprising
at least one optical fiber section including a waveguiding core; -
at least one permanent Bragg grating region in said optical fiber section, including a plurality of grating elements constituted by periodic refractive index variations of a predetermined initial periodicity and cumulatively redirecting, of the light launched into said core for guided propagation therein, that having an axial wavelength within a narrow band around a central wavelength that is determined by the periodicity and refractive index variations of said grating elements; and means for so applying at least to said grating region of said optical fiber section an external influence that is representative of a parameter other than structural strain as to modify at least one of the periodicity and refractive index variations of said grating region with an attendant change in said central wavelength within a predetermined wavelength range to an extent indicative of the magnitude of said parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification