Optical filter fabrication method and apparatus, optical filter, fiber holder with spiral groove, and phase mask
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United States of America Patent
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Aug 27, 2002
Issued Date -
N/A
app pub date -
Aug 24, 2000
filing date -
Jul 8, 1997
priority date (Note) -
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Abstract
An optical filter is manufactured by placing a photosensitive optical fiber in a spiral arrangement on a fiber holder, preferably having a spiral groove for holding the fiber, and exposing the fiber to ultraviolet light through a phase mask having a spiral diffraction grating, forming an in-fiber Bragg grating. The fiber can be conveniently scanned by an ultraviolet beam as the fiber holder and phase mask turn on a rotating stage. The fiber can be compactly packaged between the fiber holder and a cover. The fiber holder and cover can be formed by coating a substrate with layers of polymer material, the spiral groove being formed by photolithographic patterning of one of the layers.
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