Patent
1989-12-26
1991-04-16
Lee, John D.
350 9615, 350 9619, G02B 616
Patent
active
050077058
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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Glenn William H.
Leonberger Fred J.
Meltz Gerald
Morey William W.
Lee John D.
Ruzek Peter R.
United Technologies Corporation
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