Optical: systems and elements – Diffraction – From grating
Reexamination Certificate
2006-03-24
2010-06-01
Lavarias, Arnel C (Department: 2872)
Optical: systems and elements
Diffraction
From grating
C359S576000, C359S569000
Reexamination Certificate
active
07729053
ABSTRACT:
A wavelength filter, includes a grating in which a first portion extends in X direction on a substrate surface and a second portion extends in the X direction along the first portion and are alternately arranged in Y direction perpendicular to the X direction on the substrate surface at a constant cycle shorter than a wavelength of light to be used. A cross-sectional figure of respective first portions in the Y direction and perpendicular to the substrate surface is provided with at least one protruding portion so as to have the width in the Y direction wider than neighboring portions. Plural waveguide layers parallel to the substrate surface are divided by regions parallel to the substrate surface. Wavelength bands of light reflected from the plural waveguide layers shift while overlapping with each other to reflect a wavelength band broader than that reflected from a single waveguide layer.
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Lavarias Arnel C
Nalux Co., Ltd.
Squire Sanders & Dempsey L.L.P.
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