Dynamic spatial equalizer based on a spatial light modulator
US6667824B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 19, 2001 |
| Grant date | Dec 23, 2003 |
| Priority date | — |
| Expiry date | Dec 28, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/48
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A spatial light modulator (SLM) is made up of a cell filled with a liquid crystal (LC) based substance. Latter has a variable scattering property with respect to an electric field present in the cell. By using a plurality of electrodes in the direct vicinity of said cell, it is then possible to build an electric field inside it which will permit advantageously to modulate a continuous spectrum from optical signals transmitted through said cell. The different pass bands present in said continuous spectrum while at least few of them comprise at least a respective different wavelength will have to be transmitted through said cell at different regions. Latter will correspond to different values of the amplitude of scattering such to be adapted to modulate the respective different pass bands. Such SLM is used to build a dynamic spectral equalizer. Latter contains a spectral dispersive element placed on an optical path of an incident light beam. This spectral dispersive element will spread continuously said incident light beam onto said SLM such that at least each different wavelength present in said incident light beam are focused or imaged towards a different spatial region of said SLM…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.