WDM optical filter and glass substrate for use in the WDM optical filter
US6465105B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 2, 2000 |
| Grant date | Oct 15, 2002 |
| Priority date | — |
| Expiry date | Aug 2, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/008
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A glass substrate is for use in a WDM optical filter which has an optical multilayer coated on the glass substrate and is formed by glass which has a composition related to the optical multilayer so as to assure stable multiplexing/demultiplexing operation in the optical filter. The glass includes SiO2 as a glass network-former and has an average linear thermal expansion coefficient between 100×10−7/K and 130×10−7/K within a temperature range between −30° C. and +70° C. The glass may include TiO2, Al2O3, and R2O (R: alkali metal element) in addition to SiO2 and may have a hardness suitable for the optical multilayer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.