Planar waveguide echelle grating device with astigmatic grating facets
US6766077B2 · kind B2 · utility
7Cited by
6References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 13, 2001 |
| Grant date | Jul 20, 2004 |
| Priority date | — |
| Expiry date | Mar 28, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/29328
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A planar waveguide grating device has a slab waveguide defining an input channel and a plurality of output channels. An echelle grating has a multitude of facets, each of the facets being blazed with respect to a preselected output channel. Each facet has an elliptical curvature so as to be astigmatic with respect to the input channel and the preselected output channel. The echelle grating is preferably based on a Rowland circle design. The astigmatic design of the facets reduces aberrations at high orders.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.