Echelle gratings with low Polarization Dependent Loss (PDL) using metal coating on the reflecting facets only
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United States of America Patent
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May 20, 2008
Grant Date -
Sep 21, 2006
app pub date -
Nov 26, 2002
filing date -
Nov 26, 2001
priority date (Note) -
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Abstract
An Echelle grating has alternate first (1a) and second (1b) sets of facets (1). The first set of facets (1a) is operative to reflect incident light (4) for diffraction and the second set of facets (1b) extends between adjacent facets of the first set (1a). Only the first set of facets (1a) is metallized to enhance reflection. The second set of facets (1b) is left unmetallized. This configuration reduces polarization dependent loss (PDL).
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