Echelle gratings with low Polarization Dependent Loss (PDL) using metal coating on the reflecting facets only
US7376305B2 · kind B2 · utility
1Cited by
7References
7Claims
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Key dates
| Filing date | Nov 26, 2002 |
| Grant date | May 20, 2008 |
| Priority date | — |
| Expiry date | Feb 4, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/1861
- WIPO fieldOptics
- WIPO sectorInstruments
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).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.