Optical filter
US6633698B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 25, 2001 |
| Grant date | Oct 14, 2003 |
| Priority date | — |
| Expiry date | Aug 7, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2201/14
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A main optical path disposed between light input and output ends and an auxiliary optical path disposed so as to correspond to the main optical path are optically coupled to each other with first, second, and third optical couplers. The respective optical path lengths of main and auxiliary optical paths differ from each other between the first and second optical couplers and between the second and third optical couplers. Between the first and second optical couplers and between the second and third optical couplers, at least one of the main and auxiliary optical paths is provided with temperature adjusting means for adjusting the temperature of the corresponding optical path.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.