Variable optical fiber Bragg filter arrangement
December 26, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesMethod and apparatus for radiant energy modulation in optical fibers Spectral filter for integrated optics Method for impressing gratings within fiber optics Narrow-band wavelength selective optical coupler Devices and methods for selectively tapping optical energy from an optical fibre Optical fibre reflective diffraction grating devices Variable-waveguide optical branching filter Patent #: 4874216 InventorsApplicationNo. 456449 filed on 12/26/1989US Classes:385/12OPTICAL WAVEGUIDE SENSORExaminersPrimary: Lee, John D.Attorney, Agent or FirmInternational ClassG02B 006/16AbstractA 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. | |
