Multiple-cavity optical filter using change of cavity length
US5103340A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 21, 1989 |
| Grant date | Apr 7, 1992 |
| Priority date | — |
| Expiry date | Feb 21, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/055
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
This invention describes a tunable optical filter to be used in an optical communication system. The filter of this invention has a pair of resonator cavities which are cascaded. The lengths of each of the cavities change simultaneously with the change in length of a piezoelectric sleeve which contacts a reflective surface of each of the cavities through spacers. The sleeves and spacers are set so as to move the reflecting surfaces of the cavities along a single axis in response to a single control signal. When optical signals are passed through the two cavities and when the ratio of the length of the cavities is adjusted to a predetermined ratio of integers, the resonator cavity will resonate at a desired wavelength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.