Multiply periodic refractive index modulated optical filters
US6067391A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 2, 1998 |
| Grant date | May 23, 2000 |
| Priority date | — |
| Expiry date | Sep 2, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2006/12107
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A high transmission comb-like optical filter structure in wave guiding media is described, an example of which includes multiply periodic modulation of length L=UL.sub.R where U represents an integer number of identical periods of length L.sub.R and L.sub.R is the length of a series of periodically modulated elements of length s.sub.v =M.sub.v d.sub.v, v=1 to V, where M.sub.v is an integer number of cycles of length d.sub.v. Individual filter elements of length s.sub.v of a filter of the invention compared to the reflectors bounding a conventional or series coupled Fabry-Perot cavity exhibit moderate to low reflectivity. Modulation of individual filter elements may be step-wise constant, sinusoidal, or other forms of refractive index modulation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.