Variable optical attenuator and optical module
US9910300B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 2016 |
| Grant date | Mar 6, 2018 |
| Priority date | — |
| Expiry date | Feb 4, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/213
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A variable optical attenuator includes: a transparent medium configured to transmit light; a first reflective film formed on a light incidence surface of the transparent medium; a second reflective film formed on a light emission surface of the transparent medium; and a resonance length variable medium configured to vary an optical resonance length between the first reflective film and the second reflective film, wherein the first reflective film has a first reflectivity at which at least one of light of a first wavelength and light of a second wavelength is partially transmitted through the first reflective film, the at least one of light being the light of the first wavelength, and wherein the second reflective film has a second reflectivity lower than the first reflectivity for the light of the first wavelength and a third reflectivity lower than the second reflectivity for the light of the second wavelength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.