Optical filter
US6560381B2 · kind B2 · utility
8Cited by
3References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 3, 2001 |
| Grant date | May 6, 2003 |
| Priority date | — |
| Expiry date | Aug 3, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/48
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Three Mach-Zehnder interferometers 141 to 143 are connected in a series between an optical input terminal and an optical output terminal in an optical filter. Each interferometer is composed of two optical paths optical coupled at both ends by optical couplers. Only one interferometer has same optical path lengths between optical couplers. Heaters are disposed on each optical paths to allow the slope of transmission loss to change through the adjustment of the phase shift between those respective optical paths.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.