Tunable optical filtering component
US7239001B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 2002 |
| Grant date | Jul 3, 2007 |
| Priority date | — |
| Expiry date | Sep 25, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B26/001
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention relates to wavelength-selective and tunable optical filters for transmitting the light in a narrow optical spectral band, centered around an adjustable wavelength, and for blocking the transmission of wavelengths lying outside of this band.In a micromachined monolithic structure containing the optical filter proper, the component comprises a low-absorption light detection element used for slaving the tuning control of the filter to a wavelength received by the filter, this element transmitting the majority of the radiation at this wavelength. The filter is a Fabry-Pérot interferometric filter, the cavity (C) of which is tuned to a value that maximizes the power detected by the light detection element. The filter is preferably based on layers of indium phosphide and air gaps. The detection element preferably comprises a layer of gallium-indium arsenide 74 suitable for detection of the intended wavelength band.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.